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regression: thread names missing from stack overflow error messages #144481
Description
Thread names have gone missing in stack overflow messages in Rust v1.89 (currently in beta). Reproduces on both Darwin and Linux.
I haven't bisected, but the culprit is almost certainly #140628. Nothing else has touched the stack overflow code path since Rust v1.88. cc @joboet @workingjubilee @RalfJung @Mark-Simulacrum as the reviewers of #140628.
Code
I tried this code:
fn main() {
f()
}
fn f() {
f();
}I expected to see the thread name (main) included in the error message:
thread 'main' has overflowed its stack
fatal runtime error: stack overflow, aborting
Aborted
Instead, the thread is listed as <unknown>:
thread '<unknown>' has overflowed its stack
fatal runtime error: stack overflow, aborting
Aborted
Version it worked on
Works on the latest stable Rust (v1.88.0).
Version with regression
Broken in v1.89.0-beta.7. Tested on both Darwin and Linux.
rustc 1.89.0-beta.7 (4229c2e70 2025-07-25)
binary: rustc
commit-hash: 4229c2e708ce796c71747b7fa177ff4ef9aa794c
commit-date: 2025-07-25
host: aarch64-apple-darwin
release: 1.89.0-beta.7
LLVM version: 20.1.7
rustc 1.89.0-beta.7 (4229c2e70 2025-07-25)
binary: rustc
commit-hash: 4229c2e708ce796c71747b7fa177ff4ef9aa794c
commit-date: 2025-07-25
host: x86_64-unknown-linux-gnu
release: 1.89.0-beta.7
LLVM version: 20.1.7
@rustbot modify labels: +regression-from-stable-to-beta -regression-untriaged
Activity
ChrisDenton commentedon Jul 26, 2025
benesch commentedon Jul 26, 2025
Rollup merge of rust-lang#144500 - joboet:thread-name-stack-overflow,…
Rollup merge of rust-lang#144500 - joboet:thread-name-stack-overflow,…
Rollup merge of rust-lang#144500 - joboet:thread-name-stack-overflow,…
Unrolled build for #144500
Rollup merge of rust-lang#144500 - joboet:thread-name-stack-overflow,…
Rollup merge of #144500 - joboet:thread-name-stack-overflow, r=ChrisD…