Repository navigation
gh-159739: Hold the codec registry lock while unregistering - #160168
Merged
JelleZijlstra merged 1 commit intoOct 22, 2026
Merged
JelleZijlstra merged 1 commit into
JelleZijlstra merged 1 commit into
Conversation
Concurrent calls to codecs.unregister() can shrink the search path between its length check and indexed lookup in a free-threaded build. The lookup then returns NULL and an unconditional decref crashes the interpreter; hold the registry mutex across the scan and removal. Also reported in pythongh-157078. Backport to 3.15 and 3.14.
JelleZijlstra
enabled auto-merge (squash)
October 22, 2026 18:23
|
Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15. |
|
Sorry, @jelle-openai and @JelleZijlstra, I could not cleanly backport this to Please backport manually with cherry_picker, see the devguide for more information. |
|
GH-160292 is a backport of this pull request to the 3.15 branch. |
JelleZijlstra
pushed a commit
that referenced
this pull request
Oct 22, 2026
…H-160168) (#160292) Concurrent calls to codecs.unregister() can shrink the search path between its length check and indexed lookup in a free-threaded build. The lookup then returns NULL and an unconditional decref crashes the interpreter; hold the registry mutex across the scan and removal. Also reported in gh-157078. Backport to 3.15 and 3.14. (cherry picked from commit 784b305) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Concurrent calls to codecs.unregister() can shrink the search path between its length check and indexed lookup in a free-threaded build. The lookup then returns NULL and an unconditional decref crashes the interpreter; hold the registry mutex across the scan and removal. Also reported in gh-157078. Backport to 3.15 and 3.14.