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GeezerVison is showing github.com — gh-159739: Allocate thread-local state before constructing the object by jelle-openai · Pull Request #160166 · python/cpython

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@jelle-openai

@jelle-openai jelle-openai commented Oct 22, 2026 •
edited by bedevere-app Bot
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If allocating a thread-local object’s internal dictionary or watchdog set fails, a subclass finalizer can run with that state missing. Accessing a thread-local attribute then dereferences the missing state and crashes; allocate both containers before creating the object. Backport to 3.15 and 3.14.

  • Issue: Fix minor safety issues #159739

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@jelle-openai
pythongh-159739: Allocate thread-local state before constructing the …
9140543 
…object

If allocating a thread-local object’s internal dictionary or watchdog set fails, a subclass finalizer can run with that state missing. Accessing a thread-local attribute then dereferences the missing state and crashes; allocate both containers before creating the object. Backport to 3.15 and 3.14.
@bedevere-app bedevere-app Bot added the awaiting review label Oct 22, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Oct 22, 2026
Fix minor safety issues #159739
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@JelleZijlstra
JelleZijlstra merged commit 4a61673 into python:main Oct 22, 2026
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@bedevere-app bedevere-app Bot removed the awaiting review label Oct 22, 2026
@JelleZijlstra JelleZijlstra added needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Oct 22, 2026
@miss-islington-app

miss-islington-app Bot commented Oct 22, 2026

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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!
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@miss-islington-app

miss-islington-app Bot commented Oct 22, 2026

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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.15.
🐍🍒⛏🤖
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@bedevere-app

bedevere-app Bot commented Oct 22, 2026

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GH-160285 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 Oct 22, 2026
@bedevere-app

bedevere-app Bot commented Oct 22, 2026

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GH-160286 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 Oct 22, 2026
JelleZijlstra pushed a commit that referenced this pull request Oct 22, 2026
@miss-islington @jelle-openai
[3.14] gh-159739: Allocate thread-local state before constructing the…
2d358c6 
… object (GH-160166) (#160285)

If allocating a thread-local object’s internal dictionary or watchdog set fails, a subclass finalizer can run with that state missing. Accessing a thread-local attribute then dereferences the missing state and crashes; allocate both containers before creating the object. Backport to 3.15 and 3.14.
(cherry picked from commit 4a61673)

Co-authored-by: Jelle Zijlstra <[email protected]>
JelleZijlstra pushed a commit that referenced this pull request Oct 22, 2026
@miss-islington @jelle-openai
[3.15] gh-159739: Allocate thread-local state before constructing the…
28dcc8e 
… object (GH-160166) (#160286)

If allocating a thread-local object’s internal dictionary or watchdog set fails, a subclass finalizer can run with that state missing. Accessing a thread-local attribute then dereferences the missing state and crashes; allocate both containers before creating the object. Backport to 3.15 and 3.14.
(cherry picked from commit 4a61673)

Co-authored-by: Jelle Zijlstra <[email protected]>
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@jelle-openai @JelleZijlstra
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