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GeezerVison is showing github.com — gh-117657: Fix TSAN race in free-threaded GC by colesbury · Pull Request #119883 · python/cpython

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@colesbury

@colesbury colesbury commented May 31, 2024 •
edited by bedevere-app Bot
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Only call gc_restore_tid() from stop-the-world contexts. worklist_pop() can be called while other threads are running, so use a relaxed atomic to modify ob_tid.

  • Issue: Make TSAN tests pass with the GIL disabled in free-threaded builds #117657

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@colesbury
pythongh-117657: Fix TSAN race in free-threaded GC
ae557c1 
Only call `gc_restore_tid()` from stop-the-world contexts.
`worklist_pop()` can be called while other threads are running, so use a
relaxed atomic to modify `ob_tid`.
@colesbury colesbury added skip news topic-free-threading needs backport to 3.13 only security fixes labels May 31, 2024
@colesbury
colesbury requested a review from DinoV May 31, 2024 20:22
@bedevere-app bedevere-app Bot added the awaiting core review label May 31, 2024
@bedevere-app bedevere-app Bot mentioned this pull request May 31, 2024
Make TSAN tests pass with the GIL disabled in free-threaded builds #117657
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Fidget-Spinner
Fidget-Spinner approved these changes Jun 1, 2024
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Thanks to work on deferred rc, I now have a somewhat okay-ish grasp on the free-threaded GC code. This LGTM.

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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting core review labels Jun 1, 2024
@colesbury

colesbury commented Jun 1, 2024

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Thanks!
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@colesbury
colesbury merged commit 60593b2 into python:main Jun 1, 2024
@miss-islington-app

miss-islington-app Bot commented Jun 1, 2024

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Thanks @colesbury for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖
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@bedevere-app bedevere-app Bot removed the awaiting merge label Jun 1, 2024
@colesbury
colesbury deleted the gh-117657-gc branch June 1, 2024 14:04
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Jun 1, 2024
@colesbury @miss-islington
pythongh-117657: Fix TSAN race in free-threaded GC (pythonGH-119883)
029bbf7 
Only call `gc_restore_tid()` from stop-the-world contexts.
`worklist_pop()` can be called while other threads are running, so use a
relaxed atomic to modify `ob_tid`.
(cherry picked from commit 60593b2)

Co-authored-by: Sam Gross <[email protected]>
@bedevere-app

bedevere-app Bot commented Jun 1, 2024

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GH-119903 is a backport of this pull request to the 3.13 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.13 only security fixes label Jun 1, 2024
colesbury added a commit that referenced this pull request Jun 1, 2024
@miss-islington @colesbury
[3.13] gh-117657: Fix TSAN race in free-threaded GC (GH-119883) (#119903
48f3378 
)

Only call `gc_restore_tid()` from stop-the-world contexts.
`worklist_pop()` can be called while other threads are running, so use a
relaxed atomic to modify `ob_tid`.
(cherry picked from commit 60593b2)

Co-authored-by: Sam Gross <[email protected]>
barneygale pushed a commit to barneygale/cpython that referenced this pull request Jun 5, 2024
@colesbury @barneygale
pythongh-117657: Fix TSAN race in free-threaded GC (python#119883)
fe0d997 
Only call `gc_restore_tid()` from stop-the-world contexts.
`worklist_pop()` can be called while other threads are running, so use a
relaxed atomic to modify `ob_tid`.
estyxx pushed a commit to estyxx/cpython that referenced this pull request Jul 17, 2024
@colesbury @estyxx
pythongh-117657: Fix TSAN race in free-threaded GC (python#119883)
8095f62 
Only call `gc_restore_tid()` from stop-the-world contexts.
`worklist_pop()` can be called while other threads are running, so use a
relaxed atomic to modify `ob_tid`.
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@Fidget-Spinner Fidget-Spinner Fidget-Spinner approved these changes
@DinoV DinoV Awaiting requested review from DinoV

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@colesbury @Fidget-Spinner
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