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gh-98552: flush std streams in the multiprocessing forkserver before fork#141849

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gpshead merged 2 commits intopython:mainfrom
gpshead:mp-forkserver-flush-b4-fork
Nov 22, 2025
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gh-98552: flush std streams in the multiprocessing forkserver before fork#141849
gpshead merged 2 commits intopython:mainfrom
gpshead:mp-forkserver-flush-b4-fork

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@gpsheadgpshead commentedNov 22, 2025•
edited by bedevere-appbot
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A minor bug discovered by multiple authors working on a fix for the original bug in the linked issue.

@gpsheadgpshead marked this pull request as ready for reviewNovember 22, 2025 18:01
@gpsheadgpshead added needs backport to 3.13bugs and security fixes needs backport to 3.14bugs and security fixes labelsNov 22, 2025
@gpsheadgpsheadenabled auto-merge (squash)November 22, 2025 18:07
@gpsheadgpshead merged commit58badb1 intopython:mainNov 22, 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 requestNov 22, 2025
…efore fork (pythonGH-141849)* flush std streams in the multiprocessing forkserver before fork* NEWS(cherry picked from commit58badb1)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
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GH-141851 is a backport of this pull request to the3.14 branch.

@bedevere-appbedevere-appbot removed the needs backport to 3.14bugs and security fixes labelNov 22, 2025
miss-islington pushed a commit to miss-islington/cpython that referenced this pull requestNov 22, 2025
…efore fork (pythonGH-141849)* flush std streams in the multiprocessing forkserver before fork* NEWS(cherry picked from commit58badb1)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
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GH-141852 is a backport of this pull request to the3.13 branch.

@bedevere-appbedevere-appbot removed the needs backport to 3.13bugs and security fixes labelNov 22, 2025
gpshead added a commit that referenced this pull requestNov 22, 2025
…before fork (GH-141849) (#141851)gh-98552: flush std streams in the multiprocessing forkserver before fork (GH-141849)* flush std streams in the multiprocessing forkserver before fork* NEWS(cherry picked from commit58badb1)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
gpshead added a commit that referenced this pull requestNov 22, 2025
…before fork (GH-141849) (#141852)gh-98552: flush std streams in the multiprocessing forkserver before fork (GH-141849)* flush std streams in the multiprocessing forkserver before fork* NEWS(cherry picked from commit58badb1)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
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looks like this was already done for#135335, just earlier in the code from where I had been looking. reverting.

@gpsheadgpshead deleted the mp-forkserver-flush-b4-fork branchNovember 23, 2025 09:20
gpshead added a commit to gpshead/cpython that referenced this pull requestNov 23, 2025
…streams in the multiprocessing forkserver before fork (python#141849)"This reverts commit58badb1.
gpshead added a commit that referenced this pull requestNov 23, 2025
…s in the multiprocessing forkserver before fork (#141849)" (#141871)Revert (unneeded, already done elsewhere) "gh-98552: flush std streams in the multiprocessing forkserver before fork (#141849)"This reverts commit58badb1.
miss-islington pushed a commit to miss-islington/cpython that referenced this pull requestNov 23, 2025
…streams in the multiprocessing forkserver before fork (pythonGH-141849)" (pythonGH-141871)Revert (unneeded, already done elsewhere) "pythongh-98552: flush std streams in the multiprocessing forkserver before fork (pythonGH-141849)"This reverts commit58badb1.(cherry picked from commit614a28b)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
miss-islington pushed a commit to miss-islington/cpython that referenced this pull requestNov 23, 2025
…streams in the multiprocessing forkserver before fork (pythonGH-141849)" (pythonGH-141871)Revert (unneeded, already done elsewhere) "pythongh-98552: flush std streams in the multiprocessing forkserver before fork (pythonGH-141849)"This reverts commit58badb1.(cherry picked from commit614a28b)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
gpshead added a commit that referenced this pull requestNov 23, 2025
… streams in the multiprocessing forkserver before fork (GH-141849)" (GH-141871) (#141873)gh-98552: Revert (unneeded, already done elsewhere) "flush std streams in the multiprocessing forkserver before fork (GH-141849)" (GH-141871)Revert (unneeded, already done elsewhere) "gh-98552: flush std streams in the multiprocessing forkserver before fork (GH-141849)"This reverts commit58badb1.(cherry picked from commit614a28b)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
gpshead added a commit that referenced this pull requestNov 23, 2025
… streams in the multiprocessing forkserver before fork (GH-141849)" (GH-141871) (#141872)gh-98552: Revert (unneeded, already done elsewhere) "flush std streams in the multiprocessing forkserver before fork (GH-141849)" (GH-141871)Revert (unneeded, already done elsewhere) "gh-98552: flush std streams in the multiprocessing forkserver before fork (GH-141849)"This reverts commit58badb1.(cherry picked from commit614a28b)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
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⚠️⚠️⚠️ Buildbot failure⚠️⚠️⚠️

Hi! The buildbotAMD64 Debian root 3.13 (tier-1) has failed when building commite2d320b.

What do you need to do:

  1. Don't panic.
  2. Checkthe buildbot page in the devguide if you don't know what the buildbots are or how they work.
  3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1441/builds/1592) and take a look at the build logs.
  4. Check if the failure is related to this commit (e2d320b) or if it is a false positive.
  5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1441/builds/1592

Failed tests:

  • test_os

Failed subtests:

  • test_timerfd_ns_poll - test.test_os.TimerfdTests.test_timerfd_ns_poll

Summary of the results of the build (if available):

==

Click to see traceback logs
Traceback (most recent call last):  File"/root/buildarea/3.13.angelico-debian-amd64/build/Lib/test/test_os.py", line4342, intest_timerfd_ns_pollself.check_timerfd_poll(True)~~~~~~~~~~~~~~~~~~~~~~~^^^^^^  File"/root/buildarea/3.13.angelico-debian-amd64/build/Lib/test/test_os.py", line4327, incheck_timerfd_pollself.assertEqual(self.read_count_signaled(fd),1)~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^AssertionError:4 != 1Traceback (most recent call last):  File"/root/buildarea/3.13.angelico-debian-amd64/build/Lib/test/test_os.py", line4342, intest_timerfd_ns_pollself.check_timerfd_poll(True)~~~~~~~~~~~~~~~~~~~~~~~^^^^^^  File"/root/buildarea/3.13.angelico-debian-amd64/build/Lib/test/test_os.py", line4327, incheck_timerfd_pollself.assertEqual(self.read_count_signaled(fd),1)~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^AssertionError:2 != 1

StanFromIreland pushed a commit to StanFromIreland/cpython that referenced this pull requestDec 6, 2025
…efore fork (python#141849)* flush std streams in the multiprocessing forkserver before fork* NEWS
StanFromIreland pushed a commit to StanFromIreland/cpython that referenced this pull requestDec 6, 2025
…streams in the multiprocessing forkserver before fork (python#141849)" (python#141871)Revert (unneeded, already done elsewhere) "pythongh-98552: flush std streams in the multiprocessing forkserver before fork (python#141849)"This reverts commit58badb1.
ashm-dev pushed a commit to ashm-dev/cpython that referenced this pull requestDec 8, 2025
…efore fork (python#141849)* flush std streams in the multiprocessing forkserver before fork* NEWS
ashm-dev pushed a commit to ashm-dev/cpython that referenced this pull requestDec 8, 2025
…streams in the multiprocessing forkserver before fork (python#141849)" (python#141871)Revert (unneeded, already done elsewhere) "pythongh-98552: flush std streams in the multiprocessing forkserver before fork (python#141849)"This reverts commit58badb1.
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