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GeezerVison is showing github.com — gh-150750: Fix a race condition in `deque.index` with free-threading by sobolevn · Pull Request #150779 · python/cpython

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@sobolevn

@sobolevn sobolevn commented Jun 2, 2026 •
edited by bedevere-app Bot
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Typo in Modules/posixmodule.c is unrelated, but I just noticed it and decided to fix.

  • Issue: Data race between deque.index and deque mutators on Py_SIZE with free-threading #150750

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@sobolevn
sobolevn requested review from colesbury and kumaraditya303 June 2, 2026 11:23
@sobolevn
sobolevn requested a review from rhettinger as a code owner June 2, 2026 11:23
@bedevere-app bedevere-app Bot mentioned this pull request Jun 2, 2026
Data race between deque.index and deque mutators on Py_SIZE with free-threading #150750
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@bedevere-app bedevere-app Bot added the awaiting core review label Jun 2, 2026
@sobolevn
pythongh-150750: Fix a race condition in deque.index with free-thre…
c715214 
…ading
@sobolevn
sobolevn force-pushed the issue-150750 branch from 6eccba5 to c715214 Compare June 2, 2026 11:33
@rhettinger rhettinger self-assigned this Jun 2, 2026
rhettinger
rhettinger approved these changes Jun 2, 2026
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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting core review labels Jun 2, 2026
dpdani
dpdani reviewed Jun 4, 2026
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Comment thread Lib/test/test_free_threading/test_collections.py Resolved

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@sobolevn
Address review
4c690cd
@sobolevn
sobolevn enabled auto-merge (squash) June 4, 2026 13:00
@sobolevn sobolevn added needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Jun 4, 2026
@sobolevn
Address review
454039a
@sobolevn
sobolevn merged commit d83d50b into python:main Jun 4, 2026
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@bedevere-app bedevere-app Bot removed the awaiting merge label Jun 4, 2026
@miss-islington-app

miss-islington-app Bot commented Jun 4, 2026

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Thanks @sobolevn for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15.
🐍🍒⛏🤖
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@bedevere-app

bedevere-app Bot commented Jun 4, 2026

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GH-150920 is a backport of this pull request to the 3.15 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Jun 4, 2026
@bedevere-app

bedevere-app Bot commented Jun 4, 2026

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GH-150921 is a backport of this pull request to the 3.14 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Jun 4, 2026
sobolevn added a commit that referenced this pull request Jun 4, 2026
@miss-islington @sobolevn
[3.14] gh-150750: Fix a race condition in deque.index with free-thr…
2d3d11c 
…eading (GH-150779) (#150921)

gh-150750: Fix a race condition in `deque.index` with free-threading (GH-150779)
(cherry picked from commit d83d50b)

Co-authored-by: sobolevn <[email protected]>
sobolevn added a commit that referenced this pull request Jun 4, 2026
@miss-islington @sobolevn
[3.15] gh-150750: Fix a race condition in deque.index with free-thr…
42a41cc 
…eading (GH-150779) (#150920)

gh-150750: Fix a race condition in `deque.index` with free-threading (GH-150779)
(cherry picked from commit d83d50b)

Co-authored-by: sobolevn <[email protected]>
philthompson10 pushed a commit to philthompson10/cpython that referenced this pull request Jun 17, 2026
@sobolevn @philthompson10
pythongh-150750: Fix a race condition in deque.index with free-thre…
70fd181 
…ading (python#150779)
@samuelcolvin samuelcolvin mentioned this pull request Aug 31, 2026
deque.index result changed in 3.14.7 when a bound's __index__ mutates the deque #156743
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@rhettinger rhettinger rhettinger approved these changes
@colesbury colesbury Awaiting requested review from colesbury
@kumaraditya303 kumaraditya303 Awaiting requested review from kumaraditya303
+1 more reviewer
@dpdani dpdani dpdani left review comments
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3 participants

@sobolevn @rhettinger @dpdani
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