There is a bug disclosed by oss-fuzz: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=51574.

I can reproduce it by running CC=clang ./configure --with-memory-sanitizer && make -j12.

Linked PRs

• gh-102509: Start initializing ob_digit of _PyLongValue #102510
• gh-102509: Ignore acceptable access of an uninitialized value #102838
• [3.12] gh-102509: Start initializing ob_digit of _PyLongValue (GH-102510) #107464