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gh-151593: Avoid deadlock in insert_split_key(). - #152133
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We must not acquire other locks while holding the LOCK_KEYS() mutex. This issue is fixed by calling PyType_Modifed() after releasing the mutex.
nascheme
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Jun 25, 2026
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This fixes the deadlock but it introduces a correctness issue: a thread can read a stale class attribute/method back from an instance attribute it just stored. The only solution I can think of for this now is to revert GH-150489. :-( |
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We must not acquire other locks while holding the LOCK_KEYS() mutex. This issue is fixed by calling PyType_Modifed() after releasing the mutex.
Note: this PR was assisted by Claude Opus 4.8.