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gh-159739: Keep the instance type alive during ABC subclass checks - #160198
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jelle-openai wants to merge 1 commit into
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When an instance advertises a __class__ different from its actual type, ABCMeta.__instancecheck__ performs two subclass checks. The first callback can change the instance's actual type and allow its old type to be collected before the second check, causing a crash. Keep the original type alive through both checks. Backport to 3.15 and 3.14.
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When an instance advertises a __class__ different from its actual type, ABCMeta.__instancecheck__ performs two subclass checks. The first callback can change the instance's actual type and allow its old type to be collected before the second check, causing a crash. Keep the original type alive through both checks. Backport to 3.15 and 3.14.