Test workers segfault

“error: a test worker process crashed with SIGSEGV while running dist/loader_smoke.test.mjs.”

Is this your bug? What gets counted gets fixed. Pile on.

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/bun/issues/4449/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Test workers segfault in JSFinalizationRegistry::takeDeadHoldingsValue. Intermittent crash under bun test --parallel or --isolate on 1.4.2, with no native addons loaded in one report.

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File my report

Where: bun test
Error text: error: a test worker process crashed with SIGSEGV while running dist/loader_smoke.test.mjs.
Versions: 1.4.2
Platforms: Linux, macOS
How bad: Breaks a normal workflow.

Not quite your bug?

SIGSEGV in JSC GC and Workers2 people
Long bun test --isolate runs crash with SIGILL mid-run1 person
Panic on thread EAGAIN2 people

Original reports2, newest first

Oct 5, 2026bun test --parallel: worker SIGSEGV in JSFinalizationRegistry::takeDeadHoldingsValue (no native addons)#44586
Sep 28, 2026bun test --isolate: intermittent SIGSEGV in JSFinalizationRegistry::takeDeadHoldingsValue (0x70) on 1.4.2 Linux x64#44161

Test workers segfault

Is this your bug? What gets counted gets fixed. Pile on.

Is this your bug?

Not quite your bug?

Original reports2, newest first

Do you work on Bun?