2 people reported

All time, since Aug 31.

Parallel test worker hangs

Under bun test --parallel, one worker stops answering while its event loop stays alive, so every test in its file times out.

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I hit this bug: rapsheet.dev/sheets/bun/issues/5214/file
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Parallel test worker loses subprocess exit notification and hangs.

Is this your bug?

Where: bun test
Versions: 1.4.0
Platforms: Linux, macOS
How bad: Breaks a normal workflow.

Not quite your bug?

Test process never exits2 people
Test worker deadlocks in parallel1 person
Panic on thread EAGAIN2 people

Original reports2, newest first

Sep 21, 2026bun test --parallel on Linux 1.4.0: a worker loses a subprocess exit notification and stops answering (Linux counterpart to #41024)#43697
Aug 31, 2026bun test --parallel on macOS: promisified execFile never settles (lost subprocess exit notification) while the worker's event loop stays alive#41024

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