Investigate flaky test-fs-stat-bigint on macos M1

Test

test-fs-stat-bigint

Platform

macOS ARM64

Console output

node:internal/process/promises:289
            triggerUncaughtException(err, true /* fromPromise */);
            ^

AssertionError [ERR_ASSERTION]: Number version atimeMs = 1669309618654.8481, BigInt version atimeMs = 1669309618653n, Allowable delta = 1
    at verifyStats (/Users/ruyadorno/Documents/ruyadorno/node/test/parallel/test-fs-stat-bigint.js:71:7)
    at /Users/ruyadorno/Documents/ruyadorno/node/test/parallel/test-fs-stat-bigint.js:213:3 {
  generatedMessage: false,
  code: 'ERR_ASSERTION',
  actual: false,
  expected: true,
  operator: '=='
}

Build links

Seen locally, reproduced during tests in preparation for a v19.x release, will update with a build link in case it happens during CI builds

Additional information

Failing consistently when running about 50 times in parallel execution, e.g:

hyperfine -m 50 "out/Release/node test/parallel/test-fs-stat-bigint.js"

Is it specific to v19.x?

I cannot reproduce on main:

$ ./tools/test.py parallel/test-fs-stat-bigint --repeat 1000 -j 50
[00:10|% 100|+ 1000|-   0]: Done

This also happens to me today on macos m1 version 13.0 running the tests on main.

command:
./tools/test.py parallel/test-fs-stat-bigint --repeat 1000 -j 50

Node.js v20.0.0-pre
Command: out/Release/node /Users/marcoippolito/Documents/projects/forks/node/test/parallel/test-fs-stat-bigint.js
=== release test-fs-stat-bigint ===                   
Path: parallel/test-fs-stat-bigint
node:assert:400
    throw err;
    ^

AssertionError [ERR_ASSERTION]: Number version atimeMs = 1669634672268.1, BigInt version atimeMs = 1669634672248n, Allowable delta = 20
    at verifyStats (/Users/marcoippolito/Documents/projects/forks/node/test/parallel/test-fs-stat-bigint.js:71:7)
    at /Users/marcoippolito/Documents/projects/forks/node/test/parallel/test-fs-stat-bigint.js:158:7
    at /Users/marcoippolito/Documents/projects/forks/node/test/common/index.js:448:15
    at FSReqCallback.oncomplete (node:fs:199:5) {
  generatedMessage: false,
  code: 'ERR_ASSERTION',
  actual: false,
  expected: true,
  operator: '=='
}

it seems that both these assertions fail:

node/test/parallel/test-fs-stat-bigint.js

Lines 70 to 81 in 3bef549

    
           assert( 
        
             msFromNum - Number(msFromBigInt) <= allowableDelta, 
        
             `Number version ${key} = ${msFromNum}, ` + 
        
             `BigInt version ${key} = ${msFromBigInt}n, ` + 
        
             `Allowable delta = ${allowableDelta}`); 
        
           assert( 
        
             msFromNum - Number(msFromBigIntNs) <= allowableDelta, 
        
             `Number version ${key} = ${msFromNum}, ` + 
        
             `BigInt version ${nsKey} = ${nsFromBigInt}n` + 
        
             ` = ${msFromBigIntNs}ms, Allowable delta = ${allowableDelta}`);

the result of this operations fail inconsistently, exceeding the allowableDelta :
msFromNum - Number(msFromBigIntNs) <= allowableDelta
msFromNum - Number(msFromBigInt) <= allowableDelta
49.189697265625 <= 49

test: attempt to make test-fs-stat-bigint less flaky

I was able to reproduce the error in about 1% of local runs. With the change in #45925 it appeared to become less flaky locally but really difficult to say for sure.

@jasnell

@jasnell just checked out #45925 locally and tried running the same thing, it's much less recurrent to get a failure now but it still does fail from time to time 😞

grr, ok. hmm... the only thing I can think of is artificially setting the allowableDelta higher. What I did notice is that it would fail when the delta was either 0 or 1.

@jasnell

@jasnell I tried to increase the allowableDelta and it still fails

I guess this is particularly on M1, since no one complains the CI for this test?

I noticed this on local m1 env as well. The flakiness rate is pretty high, that I can even manually reproduce it by repeatedly running the test (and hence not related to parallel FWIW).

If I do it for 1000 times. it's about 15%.

$ tools/test.py --repeat=1000 test/parallel/test-fs-stat-bigint.js
[00:33|% 100|+ 854|- 146]: Done

I reporoduced it today and i guess with the latest version of macos Version 15.0.1 on M1 it passes All

Darwin Kunals-MacBook-Air-M1.local 24.0.0 Darwin Kernel Version 24.0.0: Tue Sep 24 23:36:26 PDT 2024; root:xnu-11215.1.12~1/RELEASE_ARM64_T8103 arm64

$  ./tools/test.py parallel/test-fs-stat-bigint --repeat 1000 -j 50
[00:20|% 100|+ 1000|-   0]: Done

All tests passed.

$ tools/test.py --repeat=1000 test/parallel/test-fs-stat-bigint.js
[00:22|% 100|+ 1000|-   0]: Done

All tests passed.

@RaisinTen

Hi there 🙂

I just wanted to chip in mentioning that I also experienced the flakiness on my Mac machine, I've also opened #58043 to address this flakiness (before @RaisinTen made me notice this issue)

I can confirm that on my machine a large enough allowable delta does seem to fix the issue

@RaisinTen

Hey @RaisinTen 🙂👋

Quick update on this, I've written a small script that reproduces the flakiness for statSync (+ adjustments to make it more convenient to use with fs_usage):

script

const fs = require("node:fs");
const path = require("node:path");
const assert = require("node:assert");
const { setTimeout } = require("node:timers/promises");

fs.rmSync("./tmp", { force: true, recursive: true });

console.log(`\x1b[32m This process' PID is: ${process.pid} (run: sudo fs_usage -w -f pathname ${process.pid} > fs_usage-logs.txt) \x1b[0m`);

(async () => {
  await setTimeout(15_000); // a timeout so that fs_usage can be called

  fs.mkdirSync("./tmp");

  const attempts = 100_000;
  const exitOnFail = true;

  for (let i = 0; i < attempts; i++) {
    const filename = path.resolve(
      `./tmp/test_${i}`
    );
    console.log(`\x1b[35m file = ${filename} \x1b[0m`);

    try {
      fs.writeFileSync(filename, "test");
      const startTime = process.hrtime.bigint();
      const bigintStats = fs.statSync(filename, { bigint: true });
      const numStats = fs.statSync(filename);
      const endTime = process.hrtime.bigint();
      const allowableDelta = Math.ceil(Number(endTime - startTime) / 1e6);

      const key = "atimeMs";
      const msFromBigInt = bigintStats[key];
      const msFromNum = numStats[key];

      assert(
        msFromNum - Number(msFromBigInt) <= allowableDelta,
        `Number version ${key} = ${msFromNum}, ` +
          `BigInt version ${key} = ${msFromBigInt}n, ` +
          `Delta = ${msFromNum - Number(msFromBigInt)}n, ` +
          `Allowable delta = ${allowableDelta}`
      );
    } catch (e) {
      if (e instanceof assert.AssertionError) {
        console.error(e);
      }

      if (exitOnFail) {
        throw e;
      }
    }
  }
})();

I've run it and saved the output to a fs_usage-logs.txt file (using the command the scripts logs), unfortunately this does not seem to yield any useful information, I'm including below the last few logs present in the file (where the test_16768 file is the one that caused the assertion fail while the rest did not)

the only noticeable difference is that the two stat calls on test_16768 are further apart then those of other files, and by quickly scanning all the logs that seems to apply to all the other stats too, when they are too much far apart the assertion fails otherwise it succeeds (I guess that the question now is, why they get further apart and if something else is accessing the file during that time)

logs

22:11:35.429301  close             F=19                                                                                                                                                                                       0.000020   node.96435
22:11:35.429306  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16765                                                   0.000003   node.96435
22:11:35.429336  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16765                                                   0.000002   node.96435
22:11:35.429340  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16765                                                   0.000002   node.96435
22:11:35.429342  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16765                                                   0.000002   node.96435
22:11:35.429384  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16765                                                   0.000041   node.96435
22:11:35.429515  open              F=19       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16766                                           0.000049   node.96435
22:11:35.429727  close             F=19                                                                                                                                                                                       0.000117   node.96435
22:11:35.429765  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16766                                                   0.000007   node.96435
22:11:35.429789  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16766                                                   0.000004   node.96435
22:11:35.429796  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16766                                                   0.000003   node.96435
22:11:35.429827  lstat64                                /Users/dar`io/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16766                                                   0.000002   node.96435
22:11:35.429920  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16766                                                   0.000092   node.96435
22:11:35.430194  open              F=19       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16767                                           0.000065   node.96435
22:11:35.430271  close             F=19                                                                                                                                                                                       0.000037   node.96435
22:11:35.430284  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16767                                                   0.000011   node.96435
22:11:35.430402  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16767                                                   0.000004   node.96435
22:11:35.430470  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16767                                                   0.000052   node.96435
22:11:35.430622  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16767                                                   0.000017   node.96435
22:11:35.430710  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16767                                                   0.000068   node.96435
22:11:35.430787  open              F=19       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16768                                           0.000059   node.96435
22:11:35.430826  close             F=19                                                                                                                                                                                       0.000022   node.96435
22:11:35.430965  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16768                                                   0.000020   node.96435
22:11:35.436284  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_16768                                                   0.000012   node.96435
22:11:35.466207  close             F=4                                                                                                                                                                                        0.000008   node.96435
22:11:35.466212  close             F=5                                                                                                                                                                                        0.000005   node.96435
22:11:35.466253  close             F=10                                                                                                                                                                                       0.000002   node.96437
22:11:35.466258  close             F=9                                                                                                                                                                                        0.000004   node.96437
22:11:35.466261  close             F=8                                                                                                                                                                                        0.000003   node.96437
22:11:35.466885  close             F=7                                                                                                                                                                                        0.000007   node.96435
22:11:35.466890  close             F=6                                                                                                                                                                                        0.000005   node.96435
22:11:35.466929  close             F=3                                                                                                                                                                                        0.000004   node.96435

PS: running fs_usage with -f filesys yields very similar results

Do you have the start time, end time and atime values for the success and fail cases? That should help in understanding which one of the atime values is going out of the expected start time ... end time window and by how much.

No I didn't have the values, however I re-run the script and got new logs with the times as well 🙂👍

Updated script

const fs = require("node:fs");
const path = require("node:path");
const assert = require("node:assert");
const { setTimeout } = require("node:timers/promises");

fs.rmSync("./tmp", { force: true, recursive: true });

console.error(`\x1b[32m This process' PID is: ${process.pid} (run: sudo fs_usage -w -f pathname ${process.pid} > fs_usage-logs.txt) \x1b[0m`);

(async () => {
  await setTimeout(15_000); // a timeout so that fs_usage can be called

  fs.mkdirSync("./tmp");

  const attempts = 100_000;
  const exitOnFail = true;

  for (let i = 0; i < attempts; i++) {
    const filename = path.resolve(
      `./tmp/test_${i}`
    );
    console.error(`\x1b[35m processing ${filename} \x1b[0m`);

    try {
      fs.writeFileSync(filename, "test");
      const startTime = process.hrtime.bigint();
      const bigintStats = fs.statSync(filename, { bigint: true });
      const numStats = fs.statSync(filename);
      const endTime = process.hrtime.bigint();
      const allowableDelta = Math.ceil(Number(endTime - startTime) / 1e6);

      const key = "atimeMs";
      const msFromBigInt = bigintStats[key];
      const msFromNum = numStats[key];

      console.log(`
        file: ${filename}
          startTime: ${startTime}
          endTime: ${endTime}
          allowableDelta: ${allowableDelta}
          delta: ${msFromNum - Number(msFromBigInt)}
          bigintStats[${key}]: ${bigintStats[key]}
          numStats[${key}]: ${numStats[key]}

      `);

      assert(
        msFromNum - Number(msFromBigInt) <= allowableDelta,
        `Number version ${key} = ${msFromNum}, ` +
          `BigInt version ${key} = ${msFromBigInt}n, ` +
          `Delta = ${msFromNum - Number(msFromBigInt)}n, ` +
          `Allowable delta = ${allowableDelta}`
      );

      fs.rmSync(filename); // remove the file if no flake occurred
    } catch (e) {
      if (e instanceof assert.AssertionError) {
        console.error(e);
      }

      if (exitOnFail) {
        throw e;
      }
    }
  }
})();

Last portion of script output

Note: the assertion failed for test_17635 and succeeded for all the other files

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17615
          startTime: 2643000652625
          endTime: 2643000662708
          allowableDelta: 1
          delta: 0.03759765625
          bigintStats[atimeMs]: 1745997990702
          numStats[atimeMs]: 1745997990702.0376

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17616
          startTime: 2643000815458
          endTime: 2643000829000
          allowableDelta: 1
          delta: 0.205322265625
          bigintStats[atimeMs]: 1745997990702
          numStats[atimeMs]: 1745997990702.2053

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17617
          startTime: 2643000985416
          endTime: 2643000999500
          allowableDelta: 1
          delta: 0.3759765625
          bigintStats[atimeMs]: 1745997990702
          numStats[atimeMs]: 1745997990702.376

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17618
          startTime: 2643001161500
          endTime: 2643001171750
          allowableDelta: 1
          delta: 0.5517578125
          bigintStats[atimeMs]: 1745997990702
          numStats[atimeMs]: 1745997990702.5518

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17619
          startTime: 2643001338416
          endTime: 2643001360208
          allowableDelta: 1
          delta: 0.724609375
          bigintStats[atimeMs]: 1745997990702
          numStats[atimeMs]: 1745997990702.7246

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17620
          startTime: 2643001548791
          endTime: 2643001565291
          allowableDelta: 1
          delta: 0.91455078125
          bigintStats[atimeMs]: 1745997990702
          numStats[atimeMs]: 1745997990702.9146

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17621
          startTime: 2643001740708
          endTime: 2643001753333
          allowableDelta: 1
          delta: 0.1318359375
          bigintStats[atimeMs]: 1745997990703
          numStats[atimeMs]: 1745997990703.1318

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17622
          startTime: 2643001919041
          endTime: 2643001928000
          allowableDelta: 1
          delta: 0.298095703125
          bigintStats[atimeMs]: 1745997990703
          numStats[atimeMs]: 1745997990703.298

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17623
          startTime: 2643002102041
          endTime: 2643002112791
          allowableDelta: 1
          delta: 0.486572265625
          bigintStats[atimeMs]: 1745997990703
          numStats[atimeMs]: 1745997990703.4866

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17624
          startTime: 2643002285833
          endTime: 2643002295666
          allowableDelta: 1
          delta: 0.666259765625
          bigintStats[atimeMs]: 1745997990703
          numStats[atimeMs]: 1745997990703.6663

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17625
          startTime: 2643002468750
          endTime: 2643002480958
          allowableDelta: 1
          delta: 0.85009765625
          bigintStats[atimeMs]: 1745997990703
          numStats[atimeMs]: 1745997990703.85

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17626
          startTime: 2643002645750
          endTime: 2643002656416
          allowableDelta: 1
          delta: 0.030029296875
          bigintStats[atimeMs]: 1745997990704
          numStats[atimeMs]: 1745997990704.03

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17627
          startTime: 2643002809875
          endTime: 2643002820083
          allowableDelta: 1
          delta: 0.199462890625
          bigintStats[atimeMs]: 1745997990704
          numStats[atimeMs]: 1745997990704.1995

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17628
          startTime: 2643003005333
          endTime: 2643003014000
          allowableDelta: 1
          delta: 0.38671875
          bigintStats[atimeMs]: 1745997990704
          numStats[atimeMs]: 1745997990704.3867

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17629
          startTime: 2643003173333
          endTime: 2643003181916
          allowableDelta: 1
          delta: 0.560302734375
          bigintStats[atimeMs]: 1745997990704
          numStats[atimeMs]: 1745997990704.5603

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17630
          startTime: 2643003338541
          endTime: 2643003348333
          allowableDelta: 1
          delta: 0.729248046875
          bigintStats[atimeMs]: 1745997990704
          numStats[atimeMs]: 1745997990704.7292

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17631
          startTime: 2643003517541
          endTime: 2643003529000
          allowableDelta: 1
          delta: 0.902587890625
          bigintStats[atimeMs]: 1745997990704
          numStats[atimeMs]: 1745997990704.9026

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17632
          startTime: 2643003714125
          endTime: 2643003724750
          allowableDelta: 1
          delta: 0.085693359375
          bigintStats[atimeMs]: 1745997990705
          numStats[atimeMs]: 1745997990705.0857

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17633
          startTime: 2643003892916
          endTime: 2643003903250
          allowableDelta: 1
          delta: 0.27978515625
          bigintStats[atimeMs]: 1745997990705
          numStats[atimeMs]: 1745997990705.2798

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17634
          startTime: 2643004068875
          endTime: 2643004089416
          allowableDelta: 1
          delta: 0.455810546875
          bigintStats[atimeMs]: 1745997990705
          numStats[atimeMs]: 1745997990705.4558

      

        file: /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17635
          startTime: 2643006321333
          endTime: 2643006361541
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Last portion of `fs_usage` logs

08:26:30.702104  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17615                                           0.000057   node.48102
08:26:30.702138  close             F=18                                                                                                                                                                                       0.000016   node.48102
08:26:30.702146  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17615                                                   0.000007   node.48102
08:26:30.702148  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17615                                                   0.000002   node.48102
08:26:30.702159  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17615                                                   0.000003   node.48102
08:26:30.702161  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17615                                                   0.000002   node.48102
08:26:30.702205  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17615                                                   0.000043   node.48102
08:26:30.702271  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17616                                           0.000058   node.48102
08:26:30.702301  close             F=18                                                                                                                                                                                       0.000015   node.48102
08:26:30.702312  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17616                                                   0.000011   node.48102
08:26:30.702314  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17616                                                   0.000002   node.48102
08:26:30.702330  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17616                                                   0.000008   node.48102
08:26:30.702333  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17616                                                   0.000002   node.48102
08:26:30.702378  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17616                                                   0.000045   node.48102
08:26:30.702439  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17617                                           0.000055   node.48102
08:26:30.702471  close             F=18                                                                                                                                                                                       0.000016   node.48102
08:26:30.702482  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17617                                                   0.000011   node.48102
08:26:30.702485  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17617                                                   0.000002   node.48102
08:26:30.702500  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17617                                                   0.000008   node.48102
08:26:30.702503  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17617                                                   0.000003   node.48102
08:26:30.702553  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17617                                                   0.000051   node.48102
08:26:30.702616  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17618                                           0.000054   node.48102
08:26:30.702647  close             F=18                                                                                                                                                                                       0.000015   node.48102
08:26:30.702654  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17618                                                   0.000007   node.48102
08:26:30.702657  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17618                                                   0.000002   node.48102
08:26:30.702676  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17618                                                   0.000012   node.48102
08:26:30.702679  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17618                                                   0.000003   node.48102
08:26:30.702726  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17618                                                   0.000047   node.48102
08:26:30.702794  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17619                                           0.000061   node.48102
08:26:30.702824  close             F=18                                                                                                                                                                                       0.000015   node.48102
08:26:30.702841  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17619                                                   0.000017   node.48102
08:26:30.702845  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17619                                                   0.000003   node.48102
08:26:30.702865  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17619                                                   0.000012   node.48102
08:26:30.702868  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17619                                                   0.000003   node.48102
08:26:30.702913  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17619                                                   0.000045   node.48102
08:26:30.702982  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17620                                           0.000060   node.48102
08:26:30.703033  close             F=18                                                                                                                                                                                       0.000024   node.48102
08:26:30.703047  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17620                                                   0.000012   node.48102
08:26:30.703050  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17620                                                   0.000002   node.48102
08:26:30.703070  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17620                                                   0.000008   node.48102
08:26:30.703073  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17620                                                   0.000002   node.48102
08:26:30.703129  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17620                                                   0.000056   node.48102
08:26:30.703197  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17621                                           0.000056   node.48102
08:26:30.703226  close             F=18                                                                                                                                                                                       0.000014   node.48102
08:26:30.703233  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17621                                                   0.000006   node.48102
08:26:30.703238  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17621                                                   0.000005   node.48102
08:26:30.703253  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17621                                                   0.000007   node.48102
08:26:30.703255  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17621                                                   0.000002   node.48102
08:26:30.703296  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17621                                                   0.000041   node.48102
08:26:30.703371  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17622                                           0.000068   node.48102
08:26:30.703404  close             F=18                                                                                                                                                                                       0.000016   node.48102
08:26:30.703411  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17622                                                   0.000006   node.48102
08:26:30.703413  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17622                                                   0.000002   node.48102
08:26:30.703431  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17622                                                   0.000003   node.48102
08:26:30.703433  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17622                                                   0.000002   node.48102
08:26:30.703487  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17622                                                   0.000053   node.48102
08:26:30.703556  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17623                                           0.000063   node.48102
08:26:30.703587  close             F=18                                                                                                                                                                                       0.000016   node.48102
08:26:30.703595  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17623                                                   0.000007   node.48102
08:26:30.703598  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17623                                                   0.000002   node.48102
08:26:30.703614  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17623                                                   0.000008   node.48102
08:26:30.703616  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17623                                                   0.000002   node.48102
08:26:30.703667  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17623                                                   0.000050   node.48102
08:26:30.703737  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17624                                           0.000064   node.48102
08:26:30.703771  close             F=18                                                                                                                                                                                       0.000016   node.48102
08:26:30.703778  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17624                                                   0.000007   node.48102
08:26:30.703781  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17624                                                   0.000002   node.48102
08:26:30.703798  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17624                                                   0.000008   node.48102
08:26:30.703800  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17624                                                   0.000002   node.48102
08:26:30.703852  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17624                                                   0.000052   node.48102
08:26:30.703920  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17625                                           0.000062   node.48102
08:26:30.703954  close             F=18                                                                                                                                                                                       0.000015   node.48102
08:26:30.703963  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17625                                                   0.000009   node.48102
08:26:30.703966  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17625                                                   0.000002   node.48102
08:26:30.703983  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17625                                                   0.000008   node.48102
08:26:30.703986  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17625                                                   0.000002   node.48102
08:26:30.704032  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17625                                                   0.000046   node.48102
08:26:30.704100  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17626                                           0.000062   node.48102
08:26:30.704131  close             F=18                                                                                                                                                                                       0.000017   node.48102
08:26:30.704139  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17626                                                   0.000008   node.48102
08:26:30.704142  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17626                                                   0.000002   node.48102
08:26:30.704151  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17626                                                   0.000003   node.48102
08:26:30.704154  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17626                                                   0.000002   node.48102
08:26:30.704202  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17626                                                   0.000048   node.48102
08:26:30.704266  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17627                                           0.000057   node.48102
08:26:30.704295  close             F=18                                                                                                                                                                                       0.000015   node.48102
08:26:30.704303  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17627                                                   0.000007   node.48102
08:26:30.704305  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17627                                                   0.000002   node.48102
08:26:30.704321  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17627                                                   0.000007   node.48102
08:26:30.704324  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17627                                                   0.000002   node.48102
08:26:30.704383  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17627                                                   0.000059   node.48102
08:26:30.704458  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17628                                           0.000069   node.48102
08:26:30.704491  close             F=18                                                                                                                                                                                       0.000016   node.48102
08:26:30.704497  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17628                                                   0.000006   node.48102
08:26:30.704499  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17628                                                   0.000002   node.48102
08:26:30.704510  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17628                                                   0.000002   node.48102
08:26:30.704513  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17628                                                   0.000002   node.48102
08:26:30.704559  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17628                                                   0.000046   node.48102
08:26:30.704629  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17629                                           0.000063   node.48102
08:26:30.704659  close             F=18                                                                                                                                                                                       0.000015   node.48102
08:26:30.704665  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17629                                                   0.000006   node.48102
08:26:30.704667  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17629                                                   0.000002   node.48102
08:26:30.704678  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17629                                                   0.000003   node.48102
08:26:30.704680  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17629                                                   0.000002   node.48102
08:26:30.704731  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17629                                                   0.000051   node.48102
08:26:30.704796  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17630                                           0.000059   node.48102
08:26:30.704824  close             F=18                                                                                                                                                                                       0.000013   node.48102
08:26:30.704831  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17630                                                   0.000007   node.48102
08:26:30.704834  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17630                                                   0.000002   node.48102
08:26:30.704846  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17630                                                   0.000005   node.48102
08:26:30.704848  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17630                                                   0.000002   node.48102
08:26:30.704903  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17630                                                   0.000055   node.48102
08:26:30.704973  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17631                                           0.000063   node.48102
08:26:30.705003  close             F=18                                                                                                                                                                                       0.000015   node.48102
08:26:30.705011  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17631                                                   0.000008   node.48102
08:26:30.705014  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17631                                                   0.000003   node.48102
08:26:30.705029  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17631                                                   0.000007   node.48102
08:26:30.705033  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17631                                                   0.000002   node.48102
08:26:30.705087  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17631                                                   0.000055   node.48102
08:26:30.705168  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17632                                           0.000074   node.48102
08:26:30.705199  close             F=18                                                                                                                                                                                       0.000018   node.48102
08:26:30.705206  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17632                                                   0.000006   node.48102
08:26:30.705210  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17632                                                   0.000003   node.48102
08:26:30.705226  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17632                                                   0.000008   node.48102
08:26:30.705229  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17632                                                   0.000002   node.48102
08:26:30.705278  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17632                                                   0.000049   node.48102
08:26:30.705349  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17633                                           0.000065   node.48102
08:26:30.705378  close             F=18                                                                                                                                                                                       0.000015   node.48102
08:26:30.705386  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17633                                                   0.000007   node.48102
08:26:30.705388  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17633                                                   0.000002   node.48102
08:26:30.705404  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17633                                                   0.000009   node.48102
08:26:30.705412  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17633                                                   0.000008   node.48102
08:26:30.705455  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17633                                                   0.000042   node.48102
08:26:30.705521  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17634                                           0.000060   node.48102
08:26:30.705554  close             F=18                                                                                                                                                                                       0.000017   node.48102
08:26:30.705567  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17634                                                   0.000012   node.48102
08:26:30.705575  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17634                                                   0.000007   node.48102
08:26:30.705584  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17634                                                   0.000003   node.48102
08:26:30.705593  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17634                                                   0.000008   node.48102
08:26:30.705641  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17634                                                   0.000048   node.48102
08:26:30.705711  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17635                                           0.000064   node.48102
08:26:30.705804  close             F=18                                                                                                                                                                                       0.000078   node.48102
08:26:30.707830  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17635                                                   0.000016   node.48102
08:26:30.707846  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_17635                                                   0.000009   node.48102
08:26:30.711457  close             F=4                                                                                                                                                                                        0.000003   node.48102
08:26:30.711460  close             F=5                                                                                                                                                                                        0.000003   node.48102
08:26:30.711486  close             F=10                                                                                                                                                                                       0.000001   node.48106
08:26:30.711489  close             F=9                                                                                                                                                                                        0.000002   node.48106
08:26:30.711490  close             F=8                                                                                                                                                                                        0.000002   node.48106
08:26:30.711697  close             F=7                                                                                                                                                                                        0.000002   node.48102
08:26:30.711699  close             F=6                                                                                                                                                                                        0.000002   node.48102
08:26:30.711700  close             F=3                                                                                                                                                                                        0.000001   node.48102

Now, you can check with dtruss (you would need to temporarily disable SIP for this) too to verify if mknod, utimes or read is being called which might change the atime value.

Sorry I can't do that as I am using my company's mac and can't really disable SIP on it 😓

Since the start time and end times are measured from the process start time and the times on the stat objects are measured from the system time, it is hard to understand how these are relating to one another. It would help if we can see the numbers relative to the same reference like epoch or system time. Let's also log:

the birthtime, ctime and mtime values which should be exactly the same for both stat objects but should give us more info of the timing of the file events
hrtimes before and after the writeFileSync calls to understand the time it takes to create the file

This should help us confirm if both the atimes are more than the birthtime and find out a reliable upper limit for the permissible atime differences.

Sure, I can log all the various stats and hrtimes before and afer the write 🙂👍

Updated script

const fs = require("node:fs");
const path = require("node:path");
const assert = require("node:assert");
const { setTimeout } = require("node:timers/promises");

fs.rmSync("./tmp", { force: true, recursive: true });

console.error(`\x1b[32m This process' PID is: ${process.pid} (run: sudo fs_usage -w -f pathname ${process.pid} > fs_usage-logs.txt) \x1b[0m`);

(async () => {
  await setTimeout(15_000); // a timeout so that fs_usage can be called

  fs.mkdirSync("./tmp");

  const attempts = 100_000;
  const exitOnFail = true;

  for (let i = 0; i < attempts; i++) {
    const filename = path.resolve(
      `./tmp/test_${i}`
    );
    console.error(`\x1b[35m processing ${filename} \x1b[0m`);

    try {
      const preWriteHrtime = process.hrtime.bigint();
      fs.writeFileSync(filename, "test");
      const postWriteHrtime = process.hrtime.bigint();
      const startTime = process.hrtime.bigint();
      const bigintStats = fs.statSync(filename, { bigint: true });
      const numStats = fs.statSync(filename);
      const endTime = process.hrtime.bigint();
      const allowableDelta = Math.ceil(Number(endTime - startTime) / 1e6);

      const key = "atimeMs";
      const msFromBigInt = bigintStats[key];
      const msFromNum = numStats[key];

      console.log('==='.repeat(10));
      console.log(filename);
      console.log({
        startTime,
        endTime,
        delta: msFromNum - Number(msFromBigInt),
        allowableDelta,
        preWriteHrtime,
        postWriteHrtime,
        numStats,
        bigintStats,
      });
      console.log('==='.repeat(10));
      console.log('\n'.repeat(2));

      assert(
        msFromNum - Number(msFromBigInt) <= allowableDelta,
        `Number version ${key} = ${msFromNum}, ` +
          `BigInt version ${key} = ${msFromBigInt}n, ` +
          `Delta = ${msFromNum - Number(msFromBigInt)}n, ` +
          `Allowable delta = ${allowableDelta}`
      );

      fs.rmSync(filename); // remove the file if no flake occurred
    } catch (e) {
      if (e instanceof assert.AssertionError) {
        console.error(e);
      }

      if (exitOnFail) {
        throw e;
      }
    }
  }
})();

Last portion of script output

Note: the assertion failed for test_6368 and succeeded for all the other files



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6353
{
  startTime: 54411647773375n,
  endTime: 54411647814583n,
  delta: 0.012939453125,
  allowableDelta: 1,
  preWriteHrtime: 54411647701541n,
  postWriteHrtime: 54411647773375n,
  numStats: Stats {
    dev: 16777233,
    mode: 33188,
    nlink: 1,
    uid: 502,
    gid: 20,
    rdev: 0,
    blksize: 4096,
    ino: 420108751,
    size: 4,
    blocks: 8,
    atimeMs: 1746049759461.013,
    mtimeMs: 1746049759461.0464,
    ctimeMs: 1746049759461.0464,
    birthtimeMs: 1746049759461.013,
    atime: 2025-04-30T21:49:19.461Z,
    mtime: 2025-04-30T21:49:19.461Z,
    ctime: 2025-04-30T21:49:19.461Z,
    birthtime: 2025-04-30T21:49:19.461Z
  },
  bigintStats: BigIntStats {
    dev: 16777233n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
    ino: 420108751n,
    size: 4n,
    blocks: 8n,
    atimeMs: 1746049759461n,
    mtimeMs: 1746049759461n,
    ctimeMs: 1746049759461n,
    birthtimeMs: 1746049759461n,
    atimeNs: 1746049759461012839n,
    mtimeNs: 1746049759461046422n,
    ctimeNs: 1746049759461046422n,
    birthtimeNs: 1746049759461012839n,
    atime: 2025-04-30T21:49:19.461Z,
    mtime: 2025-04-30T21:49:19.461Z,
    ctime: 2025-04-30T21:49:19.461Z,
    birthtime: 2025-04-30T21:49:19.461Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6354
{
  startTime: 54411649657291n,
  endTime: 54411649671333n,
  delta: 0.83056640625,
  allowableDelta: 1,
  preWriteHrtime: 54411649451208n,
  postWriteHrtime: 54411649656375n,
  numStats: Stats {
    dev: 16777233,
    mode: 33188,
    nlink: 1,
    uid: 502,
    gid: 20,
    rdev: 0,
    blksize: 4096,
    ino: 420108752,
    size: 4,
    blocks: 8,
    atimeMs: 1746049759462.8306,
    mtimeMs: 1746049759462.8833,
    ctimeMs: 1746049759462.8833,
    birthtimeMs: 1746049759462.8306,
    atime: 2025-04-30T21:49:19.463Z,
    mtime: 2025-04-30T21:49:19.463Z,
    ctime: 2025-04-30T21:49:19.463Z,
    birthtime: 2025-04-30T21:49:19.463Z
  },
  bigintStats: BigIntStats {
    dev: 16777233n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
    ino: 420108752n,
    size: 4n,
    blocks: 8n,
    atimeMs: 1746049759462n,
    mtimeMs: 1746049759462n,
    ctimeMs: 1746049759462n,
    birthtimeMs: 1746049759462n,
    atimeNs: 1746049759462830637n,
    mtimeNs: 1746049759462883262n,
    ctimeNs: 1746049759462883262n,
    birthtimeNs: 1746049759462830637n,
    atime: 2025-04-30T21:49:19.462Z,
    mtime: 2025-04-30T21:49:19.462Z,
    ctime: 2025-04-30T21:49:19.462Z,
    birthtime: 2025-04-30T21:49:19.462Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6355
{
  startTime: 54411650378750n,
  endTime: 54411650417041n,
  delta: 0.496337890625,
  allowableDelta: 1,
  preWriteHrtime: 54411650170583n,
  postWriteHrtime: 54411650377958n,
  numStats: Stats {
    dev: 16777233,
    mode: 33188,
    nlink: 1,
    uid: 502,
    gid: 20,
    rdev: 0,
    blksize: 4096,
    ino: 420108753,
    size: 4,
    blocks: 8,
    atimeMs: 1746049759463.4963,
    mtimeMs: 1746049759463.5742,
    ctimeMs: 1746049759463.5742,
    birthtimeMs: 1746049759463.4963,
    atime: 2025-04-30T21:49:19.463Z,
    mtime: 2025-04-30T21:49:19.464Z,
    ctime: 2025-04-30T21:49:19.464Z,
    birthtime: 2025-04-30T21:49:19.463Z
  },
  bigintStats: BigIntStats {
    dev: 16777233n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
    ino: 420108753n,
    size: 4n,
    blocks: 8n,
    atimeMs: 1746049759463n,
    mtimeMs: 1746049759463n,
    ctimeMs: 1746049759463n,
    birthtimeMs: 1746049759463n,
    atimeNs: 1746049759463496223n,
    mtimeNs: 1746049759463574140n,
    ctimeNs: 1746049759463574140n,
    birthtimeNs: 1746049759463496223n,
    atime: 2025-04-30T21:49:19.463Z,
    mtime: 2025-04-30T21:49:19.463Z,
    ctime: 2025-04-30T21:49:19.463Z,
    birthtime: 2025-04-30T21:49:19.463Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6356
{
  startTime: 54411651237875n,
  endTime: 54411651251500n,
  delta: 0.347900390625,
  allowableDelta: 1,
  preWriteHrtime: 54411651029375n,
  postWriteHrtime: 54411651237875n,
  numStats: Stats {
    dev: 16777233,
    mode: 33188,
    nlink: 1,
    uid: 502,
    gid: 20,
    rdev: 0,
    blksize: 4096,
    ino: 420108754,
    size: 4,
    blocks: 8,
    atimeMs: 1746049759464.348,
    mtimeMs: 1746049759464.4673,
    ctimeMs: 1746049759464.4673,
    birthtimeMs: 1746049759464.348,
    atime: 2025-04-30T21:49:19.464Z,
    mtime: 2025-04-30T21:49:19.464Z,
    ctime: 2025-04-30T21:49:19.464Z,
    birthtime: 2025-04-30T21:49:19.464Z
  },
  bigintStats: BigIntStats {
    dev: 16777233n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
    ino: 420108754n,
    size: 4n,
    blocks: 8n,
    atimeMs: 1746049759464n,
    mtimeMs: 1746049759464n,
    ctimeMs: 1746049759464n,
    birthtimeMs: 1746049759464n,
    atimeNs: 1746049759464347810n,
    mtimeNs: 1746049759464467227n,
    ctimeNs: 1746049759464467227n,
    birthtimeNs: 1746049759464347810n,
    atime: 2025-04-30T21:49:19.464Z,
    mtime: 2025-04-30T21:49:19.464Z,
    ctime: 2025-04-30T21:49:19.464Z,
    birthtime: 2025-04-30T21:49:19.464Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6357
{
  startTime: 54411653647791n,
  endTime: 54411653767875n,
  delta: 0.811767578125,
  allowableDelta: 1,
  preWriteHrtime: 54411653435333n,
  postWriteHrtime: 54411653647666n,
  numStats: Stats {
    dev: 16777233,
    mode: 33188,
    nlink: 1,
    uid: 502,
    gid: 20,
    rdev: 0,
    blksize: 4096,
    ino: 420108755,
    size: 4,
    blocks: 8,
    atimeMs: 1746049759466.8118,
    mtimeMs: 1746049759466.8733,
    ctimeMs: 1746049759466.8733,
    birthtimeMs: 1746049759466.8118,
    atime: 2025-04-30T21:49:19.467Z,
    mtime: 2025-04-30T21:49:19.467Z,
    ctime: 2025-04-30T21:49:19.467Z,
    birthtime: 2025-04-30T21:49:19.467Z
  },
  bigintStats: BigIntStats {
    dev: 16777233n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
    ino: 420108755n,
    size: 4n,
    blocks: 8n,
    atimeMs: 1746049759466n,
    mtimeMs: 1746049759466n,
    ctimeMs: 1746049759466n,
    birthtimeMs: 1746049759466n,
    atimeNs: 1746049759466811861n,
    mtimeNs: 1746049759466873236n,
    ctimeNs: 1746049759466873236n,
    birthtimeNs: 1746049759466811861n,
    atime: 2025-04-30T21:49:19.466Z,
    mtime: 2025-04-30T21:49:19.466Z,
    ctime: 2025-04-30T21:49:19.466Z,
    birthtime: 2025-04-30T21:49:19.466Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6358
{
  startTime: 54411654446666n,
  endTime: 54411654492375n,
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Last portion of `fs_usage` logs

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22:49:19.461028  close             F=18                                                                                                                                                                                       0.000016   node.1539297
22:49:19.461036  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6353                                                    0.000008   node.1539297
22:49:19.461069  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6353                                                    0.000005   node.1539297
22:49:19.462219  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6353                                                    0.000007   node.1539297
22:49:19.462223  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6353                                                    0.000002   node.1539297
22:49:19.462306  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6353                                                    0.000055   node.1539297
22:49:19.462822  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6354                                            0.000083   node.1539297
22:49:19.462875  close             F=18                                                                                                                                                                                       0.000024   node.1539297
22:49:19.462921  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6354                                                    0.000009   node.1539297
22:49:19.462925  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6354                                                    0.000002   node.1539297
22:49:19.463129  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6354                                                    0.000004   node.1539297
22:49:19.463132  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6354                                                    0.000002   node.1539297
22:49:19.463399  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6354                                                    0.000141   node.1539297
22:49:19.463487  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6355                                            0.000061   node.1539297
22:49:19.463603  close             F=18                                                                                                                                                                                       0.000018   node.1539297
22:49:19.463648  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6355                                                    0.000014   node.1539297
22:49:19.463671  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6355                                                    0.000002   node.1539297
22:49:19.463958  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6355                                                    0.000008   node.1539297
22:49:19.463961  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6355                                                    0.000002   node.1539297
22:49:19.464006  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6355                                                    0.000045   node.1539297
22:49:19.464334  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6356                                            0.000048   node.1539297
22:49:19.464491  close             F=18                                                                                                                                                                                       0.000057   node.1539297
22:49:19.464501  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6356                                                    0.000008   node.1539297
22:49:19.464506  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6356                                                    0.000002   node.1539297
22:49:19.466032  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6356                                                    0.000014   node.1539297
22:49:19.466216  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6356                                                    0.000005   node.1539297
22:49:19.466327  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6356                                                    0.000094   node.1539297
22:49:19.466808  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6357                                            0.000115   node.1539297
22:49:19.466869  close             F=18                                                                                                                                                                                       0.000030   node.1539297
22:49:19.466909  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6357                                                    0.000006   node.1539297
22:49:19.467017  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6357                                                    0.000024   node.1539297
22:49:19.467167  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6357                                                    0.000005   node.1539297
22:49:19.467213  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6357                                                    0.000002   node.1539297
22:49:19.467272  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6357                                                    0.000059   node.1539297
22:49:19.467624  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6358                                            0.000096   node.1539297
22:49:19.467700  close             F=18                                                                                                                                                                                       0.000027   node.1539297
22:49:19.467733  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6358                                                    0.000008   node.1539297
22:49:19.467746  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6358                                                    0.000004   node.1539297
22:49:19.469002  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6358                                                    0.000008   node.1539297
22:49:19.469019  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6358                                                    0.000007   node.1539297
22:49:19.469220  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6358                                                    0.000071   node.1539297
22:49:19.469514  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6359                                            0.000094   node.1539297
22:49:19.469666  close             F=18                                                                                                                                                                                       0.000055   node.1539297
22:49:19.469682  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6359                                                    0.000006   node.1539297
22:49:19.469702  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6359                                                    0.000009   node.1539297
22:49:19.470044  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6359                                                    0.000005   node.1539297
22:49:19.470048  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6359                                                    0.000003   node.1539297
22:49:19.470179  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6359                                                    0.000089   node.1539297
22:49:19.470349  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6360                                            0.000076   node.1539297
22:49:19.470532  close             F=18                                                                                                                                                                                       0.000048   node.1539297
22:49:19.470540  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6360                                                    0.000004   node.1539297
22:49:19.470543  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6360                                                    0.000002   node.1539297
22:49:19.470989  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6360                                                    0.000003   node.1539297
22:49:19.470991  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6360                                                    0.000002   node.1539297
22:49:19.471043  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6360                                                    0.000052   node.1539297
22:49:19.471280  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6361                                            0.000052   node.1539297
22:49:19.471541  close             F=18                                                                                                                                                                                       0.000112   node.1539297
22:49:19.471574  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6361                                                    0.000011   node.1539297
22:49:19.471723  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6361                                                    0.000015   node.1539297
22:49:19.472922  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6361                                                    0.000014   node.1539297
22:49:19.472926  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6361                                                    0.000002   node.1539297
22:49:19.472996  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6361                                                    0.000070   node.1539297
22:49:19.473168  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6362                                            0.000061   node.1539297
22:49:19.473311  close             F=18                                                                                                                                                                                       0.000057   node.1539297
22:49:19.473361  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6362                                                    0.000015   node.1539297
22:49:19.473461  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6362                                                    0.000017   node.1539297
22:49:19.473965  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6362                                                    0.000008   node.1539297
22:49:19.474032  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6362                                                    0.000022   node.1539297
22:49:19.474237  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6362                                                    0.000197   node.1539297
22:49:19.474408  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6363                                            0.000074   node.1539297
22:49:19.474619  close             F=18                                                                                                                                                                                       0.000035   node.1539297
22:49:19.474720  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6363                                                    0.000062   node.1539297
22:49:19.474725  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6363                                                    0.000002   node.1539297
22:49:19.475165  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6363                                                    0.000018   node.1539297
22:49:19.475186  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6363                                                    0.000004   node.1539297
22:49:19.475252  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6363                                                    0.000066   node.1539297
22:49:19.475544  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6364                                            0.000201   node.1539297
22:49:19.475943  close             F=18                                                                                                                                                                                       0.000105   node.1539297
22:49:19.476020  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6364                                                    0.000020   node.1539297
22:49:19.476043  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6364                                                    0.000016   node.1539297
22:49:19.476252  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6364                                                    0.000018   node.1539297
22:49:19.476332  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6364                                                    0.000016   node.1539297
22:49:19.476481  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6364                                                    0.000146   node.1539297
22:49:19.476685  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6365                                            0.000158   node.1539297
22:49:19.476781  close             F=18                                                                                                                                                                                       0.000035   node.1539297
22:49:19.476793  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6365                                                    0.000005   node.1539297
22:49:19.476797  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6365                                                    0.000002   node.1539297
22:49:19.476873  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6365                                                    0.000003   node.1539297
22:49:19.476876  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6365                                                    0.000002   node.1539297
22:49:19.476941  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6365                                                    0.000065   node.1539297
22:49:19.477153  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6366                                            0.000143   node.1539297
22:49:19.477318  close             F=18                                                                                                                                                                                       0.000055   node.1539297
22:49:19.477329  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6366                                                    0.000008   node.1539297
22:49:19.477339  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6366                                                    0.000006   node.1539297
22:49:19.477507  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6366                                                    0.000006   node.1539297
22:49:19.477513  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6366                                                    0.000004   node.1539297
22:49:19.477622  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6366                                                    0.000107   node.1539297
22:49:19.477841  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6367                                            0.000124   node.1539297
22:49:19.478107  close             F=18                                                                                                                                                                                       0.000046   node.1539297
22:49:19.478117  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6367                                                    0.000007   node.1539297
22:49:19.478122  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6367                                                    0.000002   node.1539297
22:49:19.478183  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6367                                                    0.000003   node.1539297
22:49:19.478186  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6367                                                    0.000002   node.1539297
22:49:19.478246  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6367                                                    0.000060   node.1539297
22:49:19.478505  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6368                                            0.000142   node.1539297
22:49:19.478750  close             F=18                                                                                                                                                                                       0.000139   node.1539297
22:49:19.478789  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6368                                                    0.000006   node.1539297
22:49:19.481508  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_6368                                                    0.000007   node.1539297
22:49:19.504137  close             F=4                                                                                                                                                                                        0.000009   node.1539297
22:49:19.504142  close             F=5                                                                                                                                                                                        0.000005   node.1539297
22:49:19.504196  close             F=10                                                                                                                                                                                       0.000003   node.1539299
22:49:19.504200  close             F=9                                                                                                                                                                                        0.000004   node.1539299
22:49:19.504204  close             F=8                                                                                                                                                                                        0.000004   node.1539299
22:49:19.504714  close             F=7                                                                                                                                                                                        0.000003   node.1539297
22:49:19.504717  close             F=6                                                                                                                                                                                        0.000003   node.1539297
22:49:19.504719  close             F=3                                                                                                                                                                                        0.000002   node.1539297

it is hard to understand how these are relating to one another. It would help if we can see the numbers relative to the same reference like epoch or system time

Could you clarify what you mean? would just using new Date().getTime() instead of process.hrtime to get the start and end times work for you?

Yes, let's use new Date().getTime().

Let's keep the existing stats but also add new Date().getTime() values at all the Xs:

X
writeFileSync
X
statSync with bigint
X
statSync
X

Done 🙂👍

Updated script

const fs = require("node:fs");
const path = require("node:path");
const assert = require("node:assert");
const { setTimeout } = require("node:timers/promises");

fs.rmSync("./tmp", { force: true, recursive: true });

console.error(`\x1b[32m This process' PID is: ${process.pid} (run: sudo fs_usage -w -f pathname ${process.pid} > fs_usage-logs.txt) \x1b[0m`);

(async () => {
  await setTimeout(15_000); // a timeout so that fs_usage can be called

  fs.mkdirSync("./tmp");

  const attempts = 100_000;
  const exitOnFail = true;

  for (let i = 0; i < attempts; i++) {
    const filename = path.resolve(
      `./tmp/test_${i}`
    );
    console.error(`\x1b[35m processing ${filename} \x1b[0m`);

    try {
      const preWriteTime = new Date().getTime();
      const preWriteHrtime = process.hrtime.bigint();
      fs.writeFileSync(filename, "test");
      const postWriteHrtime = process.hrtime.bigint();
      const postWriteTime = new Date().getTime();
      const startTime = process.hrtime.bigint();
      const preBigintStatSyncTime = new Date().getTime();
      const bigintStats = fs.statSync(filename, { bigint: true });
      const postBigintStatSyncTime = new Date().getTime();
      const preStatSyncTime = new Date().getTime();
      const numStats = fs.statSync(filename);
      const postStatSyncTime = new Date().getTime();
      const endTime = process.hrtime.bigint();
      const allowableDelta = Math.ceil(Number(endTime - startTime) / 1e6);

      const key = "atimeMs";
      const msFromBigInt = bigintStats[key];
      const msFromNum = numStats[key];

      console.log('==='.repeat(10));
      console.log(filename);
      console.log({
        startTime,
        endTime,
        delta: msFromNum - Number(msFromBigInt),
        allowableDelta,
        preWriteHrtime,
        postWriteHrtime,
        preWriteTime,
        postWriteTime,
        preBigintStatSyncTime,
        postBigintStatSyncTime,
        preStatSyncTime,
        postStatSyncTime,
        numStats,
        bigintStats,
      });
      console.log('==='.repeat(10));
      console.log('\n'.repeat(2));

      assert(
        msFromNum - Number(msFromBigInt) <= allowableDelta,
        `Number version ${key} = ${msFromNum}, ` +
          `BigInt version ${key} = ${msFromBigInt}n, ` +
          `Delta = ${msFromNum - Number(msFromBigInt)}n, ` +
          `Allowable delta = ${allowableDelta}`
      );

      fs.rmSync(filename); // remove the file if no flake occurred
    } catch (e) {
      if (e instanceof assert.AssertionError) {
        console.error(e);
      }

      if (exitOnFail) {
        throw e;
      }
    }
  }
})();

Last portion of script output

Note: the assertion failed for test_15319 and succeeded for all the other files




==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15299
{
  startTime: 13834844105625n,
  endTime: 13834844121416n,
  delta: 0.490234375,
  allowableDelta: 1,
  preWriteHrtime: 13834843979125n,
  postWriteHrtime: 13834844105083n,
  preWriteTime: 1746100376344,
  postWriteTime: 1746100376344,
  preBigintStatSyncTime: 1746100376344,
  postBigintStatSyncTime: 1746100376344,
  preStatSyncTime: 1746100376344,
  postStatSyncTime: 1746100376344,
  numStats: Stats {
    dev: 16777230,
    mode: 33188,
    nlink: 1,
    uid: 502,
    gid: 20,
    rdev: 0,
    blksize: 4096,
    ino: 420425679,
    size: 4,
    blocks: 8,
    atimeMs: 1746100376344.4902,
    mtimeMs: 1746100376344.5444,
    ctimeMs: 1746100376344.5444,
    birthtimeMs: 1746100376344.4902,
    atime: 2025-05-01T11:52:56.344Z,
    mtime: 2025-05-01T11:52:56.345Z,
    ctime: 2025-05-01T11:52:56.345Z,
    birthtime: 2025-05-01T11:52:56.344Z
  },
  bigintStats: BigIntStats {
    dev: 16777230n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
    ino: 420425679n,
    size: 4n,
    blocks: 8n,
    atimeMs: 1746100376344n,
    mtimeMs: 1746100376344n,
    ctimeMs: 1746100376344n,
    birthtimeMs: 1746100376344n,
    atimeNs: 1746100376344490117n,
    mtimeNs: 1746100376344544534n,
    ctimeNs: 1746100376344544534n,
    birthtimeNs: 1746100376344490117n,
    atime: 2025-05-01T11:52:56.344Z,
    mtime: 2025-05-01T11:52:56.344Z,
    ctime: 2025-05-01T11:52:56.344Z,
    birthtime: 2025-05-01T11:52:56.344Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15300
{
  startTime: 13834844404708n,
  endTime: 13834844417958n,
  delta: 0.784423828125,
  allowableDelta: 1,
  preWriteHrtime: 13834844284250n,
  postWriteHrtime: 13834844404333n,
  preWriteTime: 1746100376344,
  postWriteTime: 1746100376344,
  preBigintStatSyncTime: 1746100376344,
  postBigintStatSyncTime: 1746100376344,
  preStatSyncTime: 1746100376344,
  postStatSyncTime: 1746100376344,
  numStats: Stats {
    dev: 16777230,
    mode: 33188,
    nlink: 1,
    uid: 502,
    gid: 20,
    rdev: 0,
    blksize: 4096,
    ino: 420425680,
    size: 4,
    blocks: 8,
    atimeMs: 1746100376344.7844,
    mtimeMs: 1746100376344.8464,
    ctimeMs: 1746100376344.8464,
    birthtimeMs: 1746100376344.7844,
    atime: 2025-05-01T11:52:56.345Z,
    mtime: 2025-05-01T11:52:56.345Z,
    ctime: 2025-05-01T11:52:56.345Z,
    birthtime: 2025-05-01T11:52:56.345Z
  },
  bigintStats: BigIntStats {
    dev: 16777230n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
    ino: 420425680n,
    size: 4n,
    blocks: 8n,
    atimeMs: 1746100376344n,
    mtimeMs: 1746100376344n,
    ctimeMs: 1746100376344n,
    birthtimeMs: 1746100376344n,
    atimeNs: 1746100376344784452n,
    mtimeNs: 1746100376344846369n,
    ctimeNs: 1746100376344846369n,
    birthtimeNs: 1746100376344784452n,
    atime: 2025-05-01T11:52:56.344Z,
    mtime: 2025-05-01T11:52:56.344Z,
    ctime: 2025-05-01T11:52:56.344Z,
    birthtime: 2025-05-01T11:52:56.344Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15301
{
  startTime: 13834844679416n,
  endTime: 13834844690583n,
  delta: 0.073486328125,
  allowableDelta: 1,
  preWriteHrtime: 13834844575333n,
  postWriteHrtime: 13834844679125n,
  preWriteTime: 1746100376345,
  postWriteTime: 1746100376345,
  preBigintStatSyncTime: 1746100376345,
  postBigintStatSyncTime: 1746100376345,
  preStatSyncTime: 1746100376345,
  postStatSyncTime: 1746100376345,
  numStats: Stats {
    dev: 16777230,
    mode: 33188,
    nlink: 1,
    uid: 502,
    gid: 20,
    rdev: 0,
    blksize: 4096,
    ino: 420425681,
    size: 4,
    blocks: 8,
    atimeMs: 1746100376345.0735,
    mtimeMs: 1746100376345.1204,
    ctimeMs: 1746100376345.1204,
    birthtimeMs: 1746100376345.0735,
    atime: 2025-05-01T11:52:56.345Z,
    mtime: 2025-05-01T11:52:56.345Z,
    ctime: 2025-05-01T11:52:56.345Z,
    birthtime: 2025-05-01T11:52:56.345Z
  },
  bigintStats: BigIntStats {
    dev: 16777230n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
    ino: 420425681n,
    size: 4n,
    blocks: 8n,
    atimeMs: 1746100376345n,
    mtimeMs: 1746100376345n,
    ctimeMs: 1746100376345n,
    birthtimeMs: 1746100376345n,
    atimeNs: 1746100376345073495n,
    mtimeNs: 1746100376345120328n,
    ctimeNs: 1746100376345120328n,
    birthtimeNs: 1746100376345073495n,
    atime: 2025-05-01T11:52:56.345Z,
    mtime: 2025-05-01T11:52:56.345Z,
    ctime: 2025-05-01T11:52:56.345Z,
    birthtime: 2025-05-01T11:52:56.345Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15302
{
  startTime: 13834844950041n,
  endTime: 13834844961333n,
  delta: 0.34130859375,
  allowableDelta: 1,
  preWriteHrtime: 13834844843750n,
  postWriteHrtime: 13834844949791n,
  preWriteTime: 1746100376345,
  postWriteTime: 1746100376345,
  preBigintStatSyncTime: 1746100376345,
  postBigintStatSyncTime: 1746100376345,
  preStatSyncTime: 1746100376345,
  postStatSyncTime: 1746100376345,
  numStats: Stats {
    dev: 16777230,
    mode: 33188,
    nlink: 1,
    uid: 502,
    gid: 20,
    rdev: 0,
    blksize: 4096,
    ino: 420425682,
    size: 4,
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    atimeMs: 1746100376345.3413,
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    ctimeMs: 1746100376345.3918,
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    atime: 2025-05-01T11:52:56.345Z,
    mtime: 2025-05-01T11:52:56.345Z,
    ctime: 2025-05-01T11:52:56.345Z,
    birthtime: 2025-05-01T11:52:56.345Z
  },
  bigintStats: BigIntStats {
    dev: 16777230n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
    ino: 420425682n,
    size: 4n,
    blocks: 8n,
    atimeMs: 1746100376345n,
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    ctimeMs: 1746100376345n,
    birthtimeMs: 1746100376345n,
    atimeNs: 1746100376345341329n,
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    ctimeNs: 1746100376345391871n,
    birthtimeNs: 1746100376345341329n,
    atime: 2025-05-01T11:52:56.345Z,
    mtime: 2025-05-01T11:52:56.345Z,
    ctime: 2025-05-01T11:52:56.345Z,
    birthtime: 2025-05-01T11:52:56.345Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15303
{
  startTime: 13834845216750n,
  endTime: 13834845230666n,
  delta: 0.611572265625,
  allowableDelta: 1,
  preWriteHrtime: 13834845112833n,
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  preWriteTime: 1746100376345,
  postWriteTime: 1746100376345,
  preBigintStatSyncTime: 1746100376345,
  postBigintStatSyncTime: 1746100376345,
  preStatSyncTime: 1746100376345,
  postStatSyncTime: 1746100376345,
  numStats: Stats {
    dev: 16777230,
    mode: 33188,
    nlink: 1,
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    rdev: 0,
    blksize: 4096,
    ino: 420425683,
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    atime: 2025-05-01T11:52:56.346Z,
    mtime: 2025-05-01T11:52:56.346Z,
    ctime: 2025-05-01T11:52:56.346Z,
    birthtime: 2025-05-01T11:52:56.346Z
  },
  bigintStats: BigIntStats {
    dev: 16777230n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
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    atimeMs: 1746100376345n,
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    atime: 2025-05-01T11:52:56.345Z,
    mtime: 2025-05-01T11:52:56.345Z,
    ctime: 2025-05-01T11:52:56.345Z,
    birthtime: 2025-05-01T11:52:56.345Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15304
{
  startTime: 13834845490708n,
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  delta: 0.88134765625,
  allowableDelta: 1,
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  postWriteTime: 1746100376345,
  preBigintStatSyncTime: 1746100376345,
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  postStatSyncTime: 1746100376345,
  numStats: Stats {
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    rdev: 0,
    blksize: 4096,
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    size: 4,
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    atime: 2025-05-01T11:52:56.346Z,
    mtime: 2025-05-01T11:52:56.346Z,
    ctime: 2025-05-01T11:52:56.346Z,
    birthtime: 2025-05-01T11:52:56.346Z
  },
  bigintStats: BigIntStats {
    dev: 16777230n,
    mode: 33188n,
    nlink: 1n,
    uid: 502n,
    gid: 20n,
    rdev: 0n,
    blksize: 4096n,
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    size: 4n,
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    atimeMs: 1746100376345n,
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    atime: 2025-05-01T11:52:56.345Z,
    mtime: 2025-05-01T11:52:56.345Z,
    ctime: 2025-05-01T11:52:56.345Z,
    birthtime: 2025-05-01T11:52:56.345Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15305
{
  startTime: 13834845737000n,
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  allowableDelta: 1,
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  preBigintStatSyncTime: 1746100376346,
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  postStatSyncTime: 1746100376346,
  numStats: Stats {
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    atime: 2025-05-01T11:52:56.346Z,
    mtime: 2025-05-01T11:52:56.346Z,
    ctime: 2025-05-01T11:52:56.346Z,
    birthtime: 2025-05-01T11:52:56.346Z
  },
  bigintStats: BigIntStats {
    dev: 16777230n,
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    rdev: 0n,
    blksize: 4096n,
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    atimeMs: 1746100376346n,
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    birthtimeNs: 1746100376346131040n,
    atime: 2025-05-01T11:52:56.346Z,
    mtime: 2025-05-01T11:52:56.346Z,
    ctime: 2025-05-01T11:52:56.346Z,
    birthtime: 2025-05-01T11:52:56.346Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15306
{
  startTime: 13834846012083n,
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  numStats: Stats {
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    atime: 2025-05-01T11:52:56.346Z,
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    ctime: 2025-05-01T11:52:56.346Z,
    birthtime: 2025-05-01T11:52:56.346Z
  },
  bigintStats: BigIntStats {
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    birthtimeNs: 1746100376346395833n,
    atime: 2025-05-01T11:52:56.346Z,
    mtime: 2025-05-01T11:52:56.346Z,
    ctime: 2025-05-01T11:52:56.346Z,
    birthtime: 2025-05-01T11:52:56.346Z
  }
}
==============================



==============================
/Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15307
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12:52:56.347298  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15309                                                   0.000004   node.333978
12:52:56.347300  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15309                                                   0.000002   node.333978
12:52:56.347653  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15309                                                   0.000353   node.333978
12:52:56.347745  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15310                                           0.000074   node.333978
12:52:56.347787  close             F=18                                                                                                                                                                                       0.000020   node.333978
12:52:56.347796  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15310                                                   0.000008   node.333978
12:52:56.347799  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15310                                                   0.000002   node.333978
12:52:56.347867  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15310                                                   0.000015   node.333978
12:52:56.347870  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15310                                                   0.000002   node.333978
12:52:56.347918  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15310                                                   0.000048   node.333978
12:52:56.347989  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15311                                           0.000060   node.333978
12:52:56.348018  close             F=18                                                                                                                                                                                       0.000015   node.333978
12:52:56.348026  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15311                                                   0.000007   node.333978
12:52:56.348029  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15311                                                   0.000002   node.333978
12:52:56.348082  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15311                                                   0.000010   node.333978
12:52:56.348085  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15311                                                   0.000003   node.333978
12:52:56.348130  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15311                                                   0.000044   node.333978
12:52:56.348192  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15312                                           0.000053   node.333978
12:52:56.348219  close             F=18                                                                                                                                                                                       0.000013   node.333978
12:52:56.348227  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15312                                                   0.000007   node.333978
12:52:56.348230  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15312                                                   0.000003   node.333978
12:52:56.348285  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15312                                                   0.000007   node.333978
12:52:56.348287  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15312                                                   0.000002   node.333978
12:52:56.348337  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15312                                                   0.000050   node.333978
12:52:56.348430  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15313                                           0.000083   node.333978
12:52:56.348490  close             F=18                                                                                                                                                                                       0.000033   node.333978
12:52:56.348500  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15313                                                   0.000009   node.333978
12:52:56.348505  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15313                                                   0.000004   node.333978
12:52:56.348586  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15313                                                   0.000011   node.333978
12:52:56.348593  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15313                                                   0.000006   node.333978
12:52:56.348672  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15313                                                   0.000079   node.333978
12:52:56.348747  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15314                                           0.000065   node.333978
12:52:56.348795  close             F=18                                                                                                                                                                                       0.000023   node.333978
12:52:56.348803  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15314                                                   0.000008   node.333978
12:52:56.348806  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15314                                                   0.000002   node.333978
12:52:56.348865  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15314                                                   0.000010   node.333978
12:52:56.348867  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15314                                                   0.000002   node.333978
12:52:56.348937  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15314                                                   0.000069   node.333978
12:52:56.349015  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15315                                           0.000067   node.333978
12:52:56.349063  close             F=18                                                                                                                                                                                       0.000021   node.333978
12:52:56.349069  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15315                                                   0.000005   node.333978
12:52:56.349072  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15315                                                   0.000002   node.333978
12:52:56.349121  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15315                                                   0.000006   node.333978
12:52:56.349124  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15315                                                   0.000002   node.333978
12:52:56.349162  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15315                                                   0.000039   node.333978
12:52:56.349220  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15316                                           0.000048   node.333978
12:52:56.349246  close             F=18                                                                                                                                                                                       0.000013   node.333978
12:52:56.349251  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15316                                                   0.000004   node.333978
12:52:56.349254  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15316                                                   0.000002   node.333978
12:52:56.349299  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15316                                                   0.000005   node.333978
12:52:56.349301  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15316                                                   0.000002   node.333978
12:52:56.349335  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15316                                                   0.000034   node.333978
12:52:56.349389  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15317                                           0.000045   node.333978
12:52:56.349414  close             F=18                                                                                                                                                                                       0.000013   node.333978
12:52:56.349419  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15317                                                   0.000004   node.333978
12:52:56.349422  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15317                                                   0.000002   node.333978
12:52:56.349472  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15317                                                   0.000007   node.333978
12:52:56.349475  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15317                                                   0.000002   node.333978
12:52:56.349516  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15317                                                   0.000041   node.333978
12:52:56.349581  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15318                                           0.000055   node.333978
12:52:56.349610  close             F=18                                                                                                                                                                                       0.000015   node.333978
12:52:56.349617  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15318                                                   0.000006   node.333978
12:52:56.349622  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15318                                                   0.000004   node.333978
12:52:56.349664  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15318                                                   0.000003   node.333978
12:52:56.349666  lstat64                                /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15318                                                   0.000002   node.333978
12:52:56.349710  unlink                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15318                                                   0.000044   node.333978
12:52:56.349780  open              F=18       (_WC_T______X__)  /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15319                                           0.000059   node.333978
12:52:56.349811  close             F=18                                                                                                                                                                                       0.000018   node.333978
12:52:56.349826  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15319                                                   0.000014   node.333978
12:52:56.351210  stat64                                 /Users/dario/Repos/dario-piotrowicz/my-node-tests/issues/45612_test-fs-stat-bigint-flaky-on-macos-m1/tmp/test_15319                                                   0.000015   node.333978
12:52:56.355548  close             F=4                                                                                                                                                                                        0.000003   node.333978
12:52:56.355551  close             F=5                                                                                                                                                                                        0.000003   node.333978
12:52:56.355573  close             F=10                                                                                                                                                                                       0.000001   node.334037
12:52:56.355575  close             F=9                                                                                                                                                                                        0.000002   node.334037
12:52:56.355577  close             F=8                                                                                                                                                                                        0.000002   node.334037
12:52:56.356727  close             F=7                                                                                                                                                                                        0.000002   node.333978
12:52:56.356729  close             F=6                                                                                                                                                                                        0.000003   node.333978
12:52:56.356731  close             F=3                                                                                                                                                                                        0.000002   node.333978

  preBigintStatSyncTime: 1746100376349,
  postBigintStatSyncTime: 1746100376351,

interesting! 👀

My observations:

For the failed case:
a. atimeNs on first stat: ...49759597
b. atimeMs on first stat: ...49
c. atimeMs on second stat: ...51.1516

We see a 0.759597ms difference between the atimeMs and atimeNs values on the first bigint stat object because the atimeMs value is calculated by doing integer division with kNsPerMsBigInt which is 10n ** 6n:

node/lib/internal/fs/utils.js

Lines 500 to 503 in fc054bb

    
           this.atimeMs = atimeNs / kNsPerMsBigInt; 
        
           this.mtimeMs = mtimeNs / kNsPerMsBigInt; 
        
           this.ctimeMs = ctimeNs / kNsPerMsBigInt; 
        
           this.birthtimeMs = birthtimeNs / kNsPerMsBigInt;

This floors the value.

The accurate difference between atime on the second stat object (c) and the first stat object (a) is ...51.1516 ms - ...49.759597 ms = 1.392 ms. This is within the allowed delta without ceil = 13834850.787250 ms - 13834849.353916 ms = 1.433334ms. It only goes out of range when you compare the atime on the second stat object (c) with the floored atime on the first object (b), which is ...51.1516 ms - ...49 ms = 2.152 ms.
All the (birth|m|c)time values are exactly the same, except for the flooring differences discussed above.
As you pointed out, there is a 2ms gap before and after the first stat call for the failing case but it is 0ms for all the other cases. The new atime after this stat call looks similar to the timestamp after this stat call completed. I would not blame the stat for the atime update because you can still run the stat call on the same file on the REPL after wide intervals and it would not update the atime. Also, correlation does not imply causation. So this part is still an unsolved mystery.

My suggestions:

For 1 and 2, we can modify the calculation to account for the flooring difference.
For 3, the test can be modified to just allow the flooring difference for (birth|m|c)time values, i.e., no additional delta needed.
For 4, you can use Apple's Endpoint Security APIs, not sure which one:
https://developer.apple.com/documentation/endpointsecurity/es_event_type_auth_utimes
https://developer.apple.com/documentation/endpointsecurity/es_event_type_notify_utimes
to see if it allows you to detect what process is causing the atime change. If you're able to create a program that can detect one such case successfully but it's not able to detect any in this case, the conclusion is that it's just APFS acting crazy.

@RaisinTen

Hi @RaisinTen, sorry for the late reply 🙇

Thanks a lot for the detailed answer, for points 1,2 and 3 I've applied the following changes: dario-piotrowicz@4f913fb

Is this what you had in mind?

This seems to be working fine on my mac but:

it significantly increases the atime related flakiness (to a degree that I think is definitely not acceptable unfortunately)
even without atime it still presents some slight flakiness for mtime

Regarding point 4, that's definitely outside my area of expertise but I'll try to have a look 🙏

@dario-piotrowicz

No worries, I had a busy week too. ;)

@dario-piotrowicz your changes look sensible to me.

The atime flake is still expected because of the unsolved mystery, so the delta is still needed for this but I didn't expect the mtime to change at all.

Apparently, you don't need to write an Endpoint Security client yourself because I found out about eslogger which should already exist on your system. You can try to run that in parallel (your terminal would need full disk access):

$ sudo eslogger access create open close stat utimes write | jq -r '"\(.process.executable.path) -> \(.event)"' | grep path-of-the-file

and it would print info about what process is performing the syscalls and a JSON with event info about the syscall along with the file stat data. This should show which process is responsible for suddenly modifying these times.

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Investigate flaky test-fs-stat-bigint on macos M1 #45612

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	assert(
	msFromNum - Number(msFromBigInt) <= allowableDelta,
	`Number version ${key} = ${msFromNum}, ` +
	`BigInt version ${key} = ${msFromBigInt}n, ` +
	`Allowable delta = ${allowableDelta}`);

	assert(
	msFromNum - Number(msFromBigIntNs) <= allowableDelta,
	`Number version ${key} = ${msFromNum}, ` +
	`BigInt version ${nsKey} = ${nsFromBigInt}n` +
	` = ${msFromBigIntNs}ms, Allowable delta = ${allowableDelta}`);

	this.atimeMs = atimeNs / kNsPerMsBigInt;
	this.mtimeMs = mtimeNs / kNsPerMsBigInt;
	this.ctimeMs = ctimeNs / kNsPerMsBigInt;
	this.birthtimeMs = birthtimeNs / kNsPerMsBigInt;

Investigate flaky test-fs-stat-bigint on macos M1 #45612

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targos commented on Nov 25, 2022

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dario-piotrowicz commented on Apr 27, 2025

dario-piotrowicz commented on Apr 29, 2025

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dario-piotrowicz commented on Apr 30, 2025

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