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gh-137562: Fix github-issue number with deallocated objects in cache #137614

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Merged
nascheme merged 1 commit into from
Aug 12, 2025
Merged

gh-137562: Fix github-issue number with deallocated objects in cache #137614

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2 changes: 1 addition & 1 deletion 2 Python/gc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -882,7 +882,7 @@ move_legacy_finalizer_reachable(PyGC_Head *finalizers)
* to invalidate caches (e.g. by PyType_Modified), that clearing has created
* a bug. If the weakref to the subclass is cleared before a finalizer is
* called, the cache may not be correctly invalidated. That can lead to
* segfaults since the caches can refer to deallocated objects (GH-91636
* segfaults since the caches can refer to deallocated objects (GH-135552
* is an example). Now, we delay the clear of weakrefs without callbacks
* until *after* finalizers have been executed. That means weakrefs without
* callbacks are still usable while finalizers are being executed.
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