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GeezerVison is showing github.com — gh-133885: fix TSAN-0002 race of `last_mode` in gh-153852 by xxyzz · Pull Request #154407 · python/cpython

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@xxyzz

@xxyzz xxyzz commented Jul 22, 2026 •
edited by bedevere-app Bot
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fix TSAN-0002 race of last_mode in gh-153852

  • Issue: test_zstd failed on ubuntu with free-threading #133885

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@xxyzz
pythongh-133885: fix TSAN-0002 race of last_mode in pythongh-153852
0ade023
@xxyzz
xxyzz requested review from AA-Turner and emmatyping as code owners July 22, 2026 03:12
@bedevere-app

bedevere-app Bot commented Jul 22, 2026

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.
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@python-cla-bot

python-cla-bot Bot commented Jul 22, 2026 •
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All commit authors signed the Contributor License Agreement.

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@bedevere-app bedevere-app Bot mentioned this pull request Jul 22, 2026
test_zstd failed on ubuntu with free-threading #133885
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@bedevere-app bedevere-app Bot added the awaiting review label Jul 22, 2026
@xxyzz xxyzz mentioned this pull request Jul 22, 2026
Free-threading data races in CPython: 15 findings (9 new + 6 residual of existing FT work) #153852
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@emmatyping

emmatyping commented Oct 23, 2026

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Hi @xxyzz, this issue should already be resolved. If you are experiencing a different zstd thread safety problem, can you please open a new issue for us to discuss, ideally with a reproducer?
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@emmatyping emmatyping closed this Oct 23, 2026
@ngoldbaum ngoldbaum mentioned this pull request Oct 30, 2026
Audit all built-in modules for thread safety #116738
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@AA-Turner AA-Turner Awaiting requested review from AA-Turner AA-Turner is a code owner
@emmatyping emmatyping Awaiting requested review from emmatyping emmatyping is a code owner

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@xxyzz @emmatyping
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