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GeezerVison is showing github.com — [3.13] gh-146004: propagate all -X options to multiprocessing child processes (GH-146005) by danielKim614 · Pull Request #155938 · python/cpython

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@danielKim614

@danielKim614 danielKim614 commented Aug 17, 2026 •
edited by bedevere-app Bot
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Propagate all -X command line options to multiprocessing spawned child Python processes. (cherry picked from commit 1efe441)

  • Issue: recent -X options do not auto-propagate to multiprocessing processes #146004

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@gpshead @danielKim614
[3.13] pythongh-146004: propagate all -X options to multiprocessing c…
08066c6 
…hild processes (pythonGH-146005)

Propagate all -X command line options to multiprocessing spawned child Python processes.
(cherry picked from commit 1efe441)

Co-authored-by: Gregory P. Smith <[email protected]>
@danielKim614
danielKim614 requested a review from gpshead as a code owner August 17, 2026 06:33
This was referenced Aug 17, 2026
recent -X options do not auto-propagate to multiprocessing processes #146004
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gh-146004: propagate all -X options to multiprocessing child processes #146005
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@bedevere-app bedevere-app Bot added the awaiting review label Aug 17, 2026
@corona10 corona10 added the sprint label Aug 17, 2026
@github-project-automation github-project-automation Bot added this to Sprint Aug 17, 2026
@github-project-automation github-project-automation Bot moved this to Todo in Sprint Aug 17, 2026
@danielKim614

danielKim614 commented Aug 17, 2026

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Hi @corona10 @hugovk, this is a manual 3.13 backport of GH-146005 as part of the PyCon KR sprint (the bot couldn't backport it cleanly because of a conflict).
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hugovk
hugovk approved these changes Aug 17, 2026
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Thanks! 🚀

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@github-project-automation github-project-automation Bot moved this from Todo to In Progress in Sprint Aug 17, 2026
@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting review labels Aug 17, 2026
@hugovk
hugovk enabled auto-merge (squash) August 17, 2026 06:40
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hugovk merged commit d3f5290 into python:3.13 Aug 17, 2026
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@github-project-automation github-project-automation Bot moved this from In Progress to Done in Sprint Aug 17, 2026
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@chris-eibl

chris-eibl commented Aug 17, 2026

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This broke some Windows build bots. I've triggered a backport of #146580, which should fix it: #155965
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chris-eibl
chris-eibl reviewed Aug 17, 2026
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Comment thread Misc/NEWS.d/next/Library/2026-03-16-00-00-00.gh-issue-146004.xOptProp.rst
child processes spawned by :mod:`multiprocessing`, not just a hard-coded
subset. This makes the behavior consistent between default "spawn" and
"forkserver" start methods and the old "fork" start method. The options
that were previously not propagated are: ``context_aware_warnings``,

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Strictly speaking, not all of these apply to 3.13, for examply lazy_imports is 3.15. We haven't been that picky in the 3.14 backport, either, and the tests pass, because unsupported -X options are just silently ignored.

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@danielKim614 danielKim614 Aug 18, 2026

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Thanks for catching this and for opening #155965!
Using os_helper.temp_dir() should make the test portable on Windows.
Good point about the version-specific options as well.

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@chris-eibl chris-eibl chris-eibl left review comments
@hugovk hugovk hugovk approved these changes
@gpshead gpshead Awaiting requested review from gpshead gpshead is a code owner

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@danielKim614 @chris-eibl @hugovk @corona10 @gpshead
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