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GeezerVison is showing github.com — gh-159739: Collect grapheme iterator and segment type cycles by jelle-openai · Pull Request #159975 · python/cpython

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@jelle-openai

@jelle-openai jelle-openai commented Oct 20, 2026 •
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Collect grapheme iterator and segment type cycles. Grapheme iterators returned by unicodedata.iter_graphemes() and the segment objects they yield do not report their references to their heap types during GC traversal. If an instance participates in a cycle through its type and the unicodedata module, the collector cannot identify the cycle as unreachable, so the module and related objects can remain alive.

Backport to 3.15.

  • Issue: Fix minor safety issues #159739

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@jelle-openai
pythongh-159739: Collect grapheme iterator and segment type cycles
305182f 
Backport to 3.15.
@bedevere-app bedevere-app Bot added the awaiting review label Oct 20, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Oct 20, 2026
Fix minor safety issues #159739
Open
@JelleZijlstra 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
JelleZijlstra merged commit 990bcd9 into python:main Oct 21, 2026
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@miss-islington-app

miss-islington-app Bot commented 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.
🐍🍒⛏🤖
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@bedevere-app bedevere-app Bot removed the awaiting review label Oct 21, 2026
@miss-islington-app

miss-islington-app Bot commented Oct 21, 2026

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Sorry, @jelle-openai and @JelleZijlstra, I could not cleanly backport this to 3.14 due to a conflict.

Please backport manually with cherry_picker, see the devguide for more information.

cherry_picker 990bcd9abdd1063dc90d8f182b6f85b1d8149bb8 3.14
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@bedevere-app

bedevere-app Bot commented Oct 21, 2026

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GH-160013 is a backport of this pull request to the 3.15 branch.
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@miss-islington-app miss-islington-app Bot assigned JelleZijlstra Oct 21, 2026
@bedevere-app bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Oct 21, 2026
@JelleZijlstra JelleZijlstra 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
@miss-islington @jelle-openai
[3.15] gh-159739: Collect grapheme iterator and segment type cycles (G…
7c1f007 
…H-159975) (#160013)

(cherry picked from commit 990bcd9)

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