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gh-159739: Clear free-threaded GC worklists after early errors by jelle-openai · Pull Request #159979 · python/cpython · GitHub

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gh-159739: Clear free-threaded GC worklists after early errors - #159979

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JelleZijlstra merged 1 commit into
python:mainfrom
jelle-openai:jelle/codex/gh-159739-gc-early-error-worklists
Oct 21, 2026
Merged

JelleZijlstra merged 1 commit into
python:mainfrom
jelle-openai:jelle/codex/gh-159739-gc-early-error-worklists

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jelle-openai commented Oct 20, 2026 •
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Clear free-threaded GC worklists after early errors. On a free-threaded build, an allocation failure while marking roots or identifying unreachable objects can abort a collection after its worklists have acquired strong references. The early return abandons those references and their GC bookkeeping, so the affected objects remain alive and memory is leaked.

Backport to 3.15 and 3.14.

corona10 requested review from DinoV and nascheme October 20, 2026 23:23
JelleZijlstra added needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Oct 20, 2026
JelleZijlstra merged commit 2315d94 into python:main Oct 21, 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, 3.15.
🐍🍒⛏🤖

bedevere-app Bot commented Oct 21, 2026

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GH-160016 is a backport of this pull request to the 3.15 branch.

bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Oct 21, 2026

bedevere-app Bot commented Oct 21, 2026

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GH-160017 is a backport of this pull request to the 3.14 branch.

bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Oct 21, 2026
JelleZijlstra pushed a commit that referenced this pull request Oct 21, 2026
…GH-159979) (#160017)

(cherry picked from commit 2315d94)

Co-authored-by: Jelle Zijlstra <jelle@openai.com>
JelleZijlstra pushed a commit that referenced this pull request Oct 21, 2026
…GH-159979) (#160016)

(cherry picked from commit 2315d94)

Co-authored-by: Jelle Zijlstra <jelle@openai.com>
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