gh-115634: document ProcessPoolExecutor max_tasks_per_child bug #140897
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gpshead
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needs backport to 3.13
hauntsaninja
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Dec 30, 2025
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Thanks @gpshead for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14. |
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…pythonGH-140897) (cherry picked from commit 04899b8) Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
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GH-143302 is a backport of this pull request to the 3.14 branch. |
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…pythonGH-140897) (cherry picked from commit 04899b8539ab83657a4495203f26b3cb1a6f46dc) Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
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GH-143303 is a backport of this pull request to the 3.13 branch. |
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This stems from the user comment in #115634 (comment) - this bug has existed since the feature was introduced in 3.11 and is a footgun that causes occasional hard to debug problems when people do try to use the documented feature. We should acknowledge it in the docs.
It won't be fixed in older out of bug fix support Python versions and we still don't have it fixed in the latest version. We can update the docs to note the versions with the bug in whatever versions we do ever manage to fix it in when that happens.
I'll backport this doc update to 3.11 & 3.12 if the release managers want it, but will tweak the wording in those backports to make it clear it will not be fixed in those releases.
📚 Documentation preview 📚: https://cpython-previews--140897.org.readthedocs.build/