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bpo-45128: fixes test_multiprocessing_fork mysterious crash - #28387

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pablogsal merged 7 commits into
python:mainfrom
sobolevn:issue-45128
Sep 19, 2021
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bpo-45128: fixes test_multiprocessing_fork mysterious crash#28387
pablogsal merged 7 commits into
python:mainfrom
sobolevn:issue-45128

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@sobolevn

@sobolevnsobolevn commented Sep 16, 2021•
edited by bedevere-bot
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Several thoughts on this:

  1. Thanks a lot for @vstinner and @pablogsal for providing extra information about this crash
  2. I feel obligated to fix this due to bpo-45052: Unskips a failing test_shared_memory_basics test #28182 (comment)
  3. This is not a trivial test flow, I hope that I got it right, but very careful review is required (we cannot even catch this in CI, what was the initial problem)
  4. I hope, that this won't happen again! 👍

https://bugs.python.org/issue45128

@bedevere-botbedevere-bot added awaiting review tests Tests in the Lib/test dir labels Sep 16, 2021
@sobolevn

sobolevn commented Sep 16, 2021

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Maybe I can add some extra tests to catch this 🤔

@sobolevnsobolevn mentioned this pull request Sep 16, 2021
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@sobolevn

sobolevn commented Sep 16, 2021

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I've created a bpo entry for this Windows build failures: https://bugs.python.org/issue45220

vstinner
vstinner reviewed Sep 16, 2021
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Comment threadLib/test/test_logging.py Outdated
Comment threadLib/test/test_logging.py Outdated
Comment threadMisc/NEWS.d/next/Tests/2021-09-16-17-22-35.bpo-45128.Jz6fl2.rst Outdated
vstinner
vstinner reviewed Sep 16, 2021
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I would prefer a PR with only replace del ... with with .... No need to go further.

Comment threadLib/test/test_logging.py Outdated
Comment threadLib/test/test_logging.py Outdated
vstinner
vstinner reviewed Sep 16, 2021
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Please rebase your PR on the main branch to get the fix for the Windows build.

Comment threadMisc/NEWS.d/next/Tests/2021-09-16-17-22-35.bpo-45128.Jz6fl2.rst Outdated
@sobolevn

sobolevn commented Sep 18, 2021

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Rebased ♻️

@pablogsal
pablogsal merged commit 1d42408 into python:mainSep 19, 2021
@pablogsal

pablogsal commented Sep 19, 2021

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Thanks a lot for the fix @sobolevn!

Does this need to be backported to something before 3.10?

@pablogsalpablogsal added the needs backport to 3.10 only security fixes label Sep 19, 2021
@miss-islington

miss-islington commented Sep 19, 2021

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Thanks @sobolevn for the PR, and @pablogsal for merging it 🌮🎉.. I'm working now to backport this PR to: 3.10.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Sep 19, 2021
@sobolevn@miss-islington
bpo-45128: fixestest_multiprocessing_forkmysterious crash (python…
cfea1c9
…GH-28387)
(cherry picked from commit 1d42408)
Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
@bedevere-bot

bedevere-bot commented Sep 19, 2021

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GH-28462 is a backport of this pull request to the 3.10 branch.

@bedevere-botbedevere-bot removed the needs backport to 3.10 only security fixes label Sep 19, 2021
miss-islington added a commit that referenced this pull request Sep 19, 2021
@miss-islington@sobolevn
bpo-45128: fixestest_multiprocessing_forkmysterious crash (GH-28387)
0e96086
(cherry picked from commit 1d42408)
Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
pablogsal pushed a commit that referenced this pull request Sep 19, 2021
@miss-islington@sobolevn@pablogsal
bpo-45128: fixestest_multiprocessing_forkmysterious crash (GH-28387)
7661103
(cherry picked from commit 1d42408)
Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
@sobolevn

sobolevn commented Sep 20, 2021

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Thanks, everyone!

@pablogsal no, this test does not exist in 3.9
https://github.com/python/cpython/blob/3.9/Lib/test/test_logging.py

niyas-sait pushed a commit to niyas-sait/cpython that referenced this pull request Sep 21, 2021
@sobolevn@niyas-sait
bpo-45128: fixestest_multiprocessing_forkmysterious crash (python…
b5ab1dd
…GH-28387)
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