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[Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes' #113686

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[Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes'#113686
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Known Build ErrorUse this to report build issues in the .NET Helix tabarea-System.Compositioninvestigateruntime-monospecific to the Mono runtimetest-bugProblem in test source code (most likely)
Milestone
Future

Description

@antonfirsov
antonfirsov
opened on Mar 19, 2025

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=984942
Build error leg or test failing: System.Composition.Tests.WorkItemExecution
Pull request: #112417

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "[Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes'",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=984942
Error message validated: [[Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes']
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 3/19/2025 12:38:53 PM UTC

Report

Summary

24-Hour Hit Count 7-Day Hit Count 1-Month Count
0 0 0

Activity

  1. antonfirsov
    added
    blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'
    Known Build ErrorUse this to report build issues in the .NET Helix tab
    on Mar 19, 2025
  2. ghost added
    area-Infrastructure-libraries
    on Mar 19, 2025
  3. dotnet-policy-service
    added
    untriagedNew issue has not been triaged by the area owner
    on Mar 19, 2025

  4. dotnet-policy-service commented on Mar 19, 2025

    @dotnet-policy-service
    dotnet-policy-serviceBot
    on Mar 19, 2025 – with Dotnet Policy Service
    Contributor

    Tagging subscribers to this area: @dotnet/area-infrastructure-libraries
    See info in area-owners.md if you want to be subscribed.

  5. antonfirsov
    added
    area-System.Composition
    and removed
    area-Infrastructure-libraries
    on Mar 19, 2025

  6. dotnet-policy-service commented on Mar 19, 2025

    @dotnet-policy-service
    dotnet-policy-serviceBot
    on Mar 19, 2025 – with Dotnet Policy Service
    Contributor

    Tagging subscribers to this area: @dotnet/area-system-composition
    See info in area-owners.md if you want to be subscribed.

  7. jkotas
    added
    runtime-monospecific to the Mono runtime
    on Mar 19, 2025
  8. steveharter
    added
    bug
    on Mar 24, 2025
  9. steveharter
    self-assigned this
    on Mar 24, 2025
  10. steveharter
    added
    test-bugProblem in test source code (most likely)
    and removed
    untriagedNew issue has not been triaged by the area owner
    bug
    on Mar 24, 2025
  11. steveharter
    added this to the 10.0.0 milestone on Mar 24, 2025
  12. steveharter
    removed their assignment
    on Mar 24, 2025

  13. steveharter commented on Mar 24, 2025

    @steveharter
    steveharter
    on Mar 24, 2025
    Contributor

    Sample log:

    Console log: 'System.Composition.Tests' from job 32757c85-c398-45a6-9f4b-356b5f0b3229 workitem 69dc8642-cfc4-4b8b-836c-aa84d2a9a897 (ubuntu.2204.amd64.open.rt) executed on machine a0059D1 running Linux-6.8.0-1021-azure-x86_64-with-glibc2.35
+ export __TestArchitecture=x64
+ ./RunTests.sh --runtime-path /datadisks/disk1/work/9F3D08C6/p
========================= Begin custom configuration settings ==============================
export XUNIT_HIDE_PASSING_OUTPUT_DIAGNOSTICS=1
========================== End custom configuration settings ===============================
----- start Thu Mar 20 10:26:18 PM UTC 2025 =============== To repro directly: =====================================================
pushd .
/datadisks/disk1/work/9F3D08C6/p/dotnet exec --runtimeconfig System.Composition.Tests.runtimeconfig.json --depsfile System.Composition.Tests.deps.json xunit.console.dll System.Composition.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing 
popd
===========================================================================================================
/datadisks/disk1/work/9F3D08C6/w/B3B509BA/e /datadisks/disk1/work/9F3D08C6/w/B3B509BA/e
  Discovering: System.Composition.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Composition.Tests (found 138 of 139 test cases)
  Starting:    System.Composition.Tests (parallel test collections = on [2 threads], stop on fail = off)
   System.Composition.Tests: [Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes', Elapsed: 00:02:11
   System.Composition.Tests: [Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes', Elapsed: 00:04:11
   System.Composition.Tests: [Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes', Elapsed: 00:06:11
   System.Composition.Tests: [Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes', Elapsed: 00:08:11
   System.Composition.Tests: [Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes', Elapsed: 00:10:11
   System.Composition.Tests: [Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes', Elapsed: 00:12:11
   System.Composition.Tests: [Long Running Test] 'System.Composition.UnitTests.ConcurrencyTests.SharedInstancesAreNotVisibleUntilActivationCompletes', Elapsed: 00:14:11
['System.Composition.Tests' END OF WORK ITEM LOG: Command timed out, and was killed]

  14. steveharter commented on Mar 24, 2025

    @steveharter
    steveharter
    on Mar 24, 2025
    Contributor

    The test has not been modified.

    The code in System.Composition has not changed except for #113667 which "updates the target .NET Framework version from net48 to net481 in pipelines, tests, and documentation to meet the requirements for consuming xUnit v3." and that appears to be been added 1 day after the first reported test failure.

  15. steveharter
    added
    investigate
    on Mar 24, 2025
  16. jeffhandley
    modified the milestones: 10.0.0, Future on Jul 26, 2025
  17. jeffschwMSFT
    removed
    blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'
    on Mar 18, 2026

  18. jeffschwMSFT commented on Mar 18, 2026

    @jeffschwMSFT
    jeffschwMSFT
    on Mar 18, 2026
    Member

    removing blocking-clean-ci as it has not failed in 30 days

    24-Hour Hit Count 7-Day Hit Count 1-Month Count
    0 0 0

  19. danmoseley commented on Mar 22, 2026

    @danmoseley
    danmoseley
    on Mar 22, 2026
    Contributor

    Note

    This comment was AI/Copilot-generated.

    Known Issue Failure History

    Analysis of edit history on this issue (via known-issue-history skill):

    Metric Value
    Total failure events 184
    Failure periods 1 (never fully cleared)
    Last failure 2026-02-16
    Days since last failure 33
    Peak 24h hit count 4
    Peak 1-month hit count 30

    This test has been failing continuously since March 19, 2025 — nearly a full year of uninterrupted flakiness. It has never dropped to 0/0/0 hit counts (one single failure period). It's been quieter recently (last failure 33 days ago) but hasn't formally cleared.

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