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URL: http://github.com/python/cpython/issues/148074

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typeobject.c: Missing return -1 after PyErr_Format in type_ready_post_checks · Issue #148074 · python/cpython · GitHub
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typeobject.c: Missing return -1 after PyErr_Format in type_ready_post_checks #148074

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typeobject.c: Missing return -1 after PyErr_Format in type_ready_post_checks#148074
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interpreter-core(Objects, Python, Grammar, and Parser dirs)topic-typingtype-bugAn unexpected behavior, bug, or error
@Wulian233

Description

@Wulian233
Wulian233
opened on Apr 4, 2026

Bug report

Bug description:

Parent issue #146102

https://gist.github.com/devdanzin/551cace22f112ef0ff4ed3fdbe54d235

At line 9314-9320, PyErr_Format sets a SystemError for invalid tp_dictoffset but falls through to return 0 (success). Type finishes initialization with invalid offset and pending exception. Requires C extension to trigger.

CPython versions tested on:

CPython main branch, 3.15, 3.14

Operating systems tested on:

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