[3.13] gh-132969: Fix error/hang when shutdown(wait=False) and task exited abnormally (GH-133222)#135343
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encukou merged 1 commit intopython:3.13from Jun 16, 2025
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…ited abnormally (pythonGH-133222) When shutdown is called with wait=False, the executor thread keeps running even after the ProcessPoolExecutor's state is reset. The executor then tries to replenish the worker processes pool resulting in an error and a potential hang when it comes across a worker that has died. Fixed the issue by having _adjust_process_count() return without doing anything if the ProcessPoolExecutor's state has been reset. Added unit tests to validate two scenarios: max_workers < num_tasks (exception) max_workers > num_tasks (exception + hang) (cherry picked from commit 598aa7c) Co-authored-by: Ajay Kamdar <140011370+ogbiggles@users.noreply.github.com>
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🤖 New build scheduled with the buildbot fleet by @encukou for commit 51fa131 🤖 Results will be shown at: https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F135343%2Fmerge If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again. |
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The buildbot failures are unrelated. I'll make the careful choice to backport the fix. |
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When shutdown is called with wait=False, the executor thread keeps running
even after the ProcessPoolExecutor's state is reset. The executor then tries
to replenish the worker processes pool resulting in an error and a potential hang
when it comes across a worker that has died. Fixed the issue by having
_adjust_process_count() return without doing anything if the ProcessPoolExecutor's
state has been reset.
Added unit tests to validate two scenarios:
max_workers < num_tasks (exception)
max_workers > num_tasks (exception + hang)
(cherry picked from commit 598aa7c)
Co-authored-by: Ajay Kamdar 140011370+ogbiggles@users.noreply.github.com
ProcessPoolExecutorraises exception or hangs the process whenshutdown(wait=False)and worker throws exception #132969