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GeezerVison is showing github.com — Abort from `GenericAlias.__sizeof__`: `ob->ob_type != &PyLong_Type` · Issue #127603 · python/cpython

Abort from GenericAlias.__sizeof__: ob->ob_type != &PyLong_Type #127603

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Abort from GenericAlias.__sizeof__: ob->ob_type != &PyLong_Type#127603
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3.12only security fixesonly security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Description

@devdanzin
devdanzin
opened on Dec 4, 2024
Issue body actions

Crash report

What happened?

It's possible to abort the interpreter in 3.12 by calling __sizeof__ of a GenericAlias instance:

from types import GenericAlias

g = GenericAlias(BaseException, Exception)
g.__sizeof__(1)

Abort message:

python: ./Include/object.h:231: Py_SIZE: Assertion `ob->ob_type != &PyLong_Type' failed.
Aborted

Found using fusil by @vstinner.

CPython versions tested on:

3.12

Operating systems tested on:

Linux

Output from running 'python -VV' on the command line:

Python 3.12.8+ (heads/3.12:8e3c2d2, Dec 4 2024, 10:58:33) [GCC 11.4.0]

Activity

  1. devdanzin
    added
    type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump
    on Dec 4, 2024

  2. vstinner commented on Dec 4, 2024

    @vstinner
    vstinner
    on Dec 4, 2024
    Member
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    I created #127605 backport to fix the issue.

  3. picnixz
    added
    topic-typing
    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)
    3.12only security fixesonly security fixes
    and removed
    topic-typing
    on Dec 5, 2024

  4. vstinner commented on Dec 11, 2024

    @vstinner
    vstinner
    on Dec 11, 2024
    Member
    More actions

    Fixed by commit 0964f9f. Thanks for your bug report.

  5. vstinner
    closed this as completedon Dec 11, 2024
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    3.12only security fixesonly security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

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