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gh-115634: document ProcessPoolExecutor max_tasks_per_child bug#140897

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gpshead merged 1 commit intopython:mainfrom
gpshead:max-tasks-per-child-docs-warning
Dec 30, 2025
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gh-115634: document ProcessPoolExecutor max_tasks_per_child bug#140897
gpshead merged 1 commit intopython:mainfrom
gpshead:max-tasks-per-child-docs-warning

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@gpsheadgpshead commentedNov 2, 2025
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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/

@gpsheadgpshead merged commit04899b8 intopython:mainDec 30, 2025
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@github-project-automationgithub-project-automationbot moved this fromTodo toDone inDocs PRsDec 30, 2025
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Thanks@gpshead for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull requestDec 30, 2025
…pythonGH-140897)(cherry picked from commit04899b8)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 the3.14 branch.

miss-islington pushed a commit to miss-islington/cpython that referenced this pull requestDec 30, 2025
…pythonGH-140897)(cherry picked from commit04899b8)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
@bedevere-appbedevere-appbot removed the needs backport to 3.14bugs and security fixes labelDec 30, 2025
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GH-143303 is a backport of this pull request to the3.13 branch.

@bedevere-appbedevere-appbot removed the needs backport to 3.13bugs and security fixes labelDec 30, 2025
gpshead added a commit that referenced this pull requestDec 30, 2025
GH-140897) (#143302)gh-115634: document ProcessPoolExecutor max_tasks_per_child bug (GH-140897)(cherry picked from commit04899b8)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
gpshead added a commit that referenced this pull requestDec 30, 2025
GH-140897) (#143303)gh-115634: document ProcessPoolExecutor max_tasks_per_child bug (GH-140897)(cherry picked from commit04899b8)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
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