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GeezerVison is showing github.com — gh-137400: Stop the world when swapping profile functions by godlygeek · Pull Request #137472 · python/cpython

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@godlygeek

@godlygeek godlygeek commented Aug 6, 2025 •
edited by bedevere-app Bot
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One thread's profile function or profile object can be changed from another thread, for instance by sys._setprofileallthreads. This can lead to crashes unless the two threads are synchronized. We need a stop-the-world to ensure that the thread whose profile function or profile object is being changed is in a state where it's not in the middle of using either of those pointers.

  • Issue: sys._setprofileallthreads race condition #137400

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@godlygeek
pythongh-137400: Stop the world when swapping profile functions
f29f878 
One thread's profile function or profile object can be changed from
another thread, for instance by `sys._setprofileallthreads`. This can
lead to crashes unless the two threads are synchronized. We need
a stop-the-world to ensure that the thread whose profile function or
profile object is being changed is in a state where it's not in the
middle of using either of those pointers.

Signed-off-by: Matt Wozniski <[email protected]>
@bedevere-app bedevere-app Bot added the awaiting review label Aug 6, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Aug 6, 2025
sys._setprofileallthreads race condition #137400
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@godlygeek
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ba36824 
Signed-off-by: Matt Wozniski <[email protected]>
@godlygeek

godlygeek commented Aug 6, 2025

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CC: @colesbury @pablogsal
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@godlygeek

godlygeek commented Aug 6, 2025

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Ah, nevermind, I see @colesbury beat me to it with #137471 and added a test to boot.
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@godlygeek godlygeek closed this Aug 6, 2025
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@godlygeek
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