fix(internal): do not restart any ThreadRestartTimer threads [backport 4.6]#17326
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brettlangdon merged 1 commit intoApr 6, 2026
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## Description We have a possible situation where we can end up with orphaned `ThreadRestartTimer` threads in fork-heavy applications. If a fork occurs while the current `ThreadRestartTimer` thread is in the stopping state (after `cls._instance = None` has already been called) then it will appear in `periodic_threads` and be added to `_threads_to_restart_after_fork` and then force restarted. ## Testing <!-- Describe your testing strategy or note what tests are included --> ## Risks <!-- Note any risks associated with this change, or "None" if no risks --> ## Additional Notes This bug is really really hard to reproduce and technically shouldn't be possible because the GIL should be held throughout the whole `os.fork()` call, but this is a code path which could cause some of the crashes we've seen in a fork-heavy application and is an easy defensive guard to add. Co-authored-by: juanjux <juanjo.alvarezmartinez@datadoghq.com> (cherry picked from commit 96352ec)
brettlangdon
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Apr 6, 2026
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Description
Backport of #17312