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Segmentation fault on Python 3.14 rc1 on macOS #137617

Closed as duplicate
Closed as duplicate
Segmentation fault on Python 3.14 rc1 on macOS#137617
Labels
3.14bugs and security fixesOS-mactype-crashA hard crash of the interpreter, possibly with a core dump

Description

@MatthieuDartiailh
MatthieuDartiailh
opened on Aug 10, 2025

Bug report

Bug description:

Running the pyclibrary testsuite on Python 3.14-rc1 segfaults on macOS (while it succeeds on Linux and Windows).

The CI job that displayed the issue is https://github.com/MatthieuDartiailh/pyclibrary/actions/runs/16865688466/job/47772236565?pr=83

CPython versions tested on:

3.14

Operating systems tested on:

macOS

Activity

  1. MatthieuDartiailh
    added
    type-bugAn unexpected behavior, bug, or error
    on Aug 10, 2025
  2. hugovk
    added
    OS-mac
    type-crashA hard crash of the interpreter, possibly with a core dump
    3.14bugs and security fixes
    and removed
    type-bugAn unexpected behavior, bug, or error
    on Aug 10, 2025

  3. hugovk commented on Aug 10, 2025

    @hugovk
    hugovk
    on Aug 10, 2025
    Member

    Are you able to create a minimal code example to reproduce this?

    Tips here:

    https://stackoverflow.com/help/minimal-reproducible-example

  4. inventshah commented on Aug 10, 2025

    @inventshah
    inventshah
    on Aug 10, 2025
    Contributor

    Looks related to #137573 since it has the same Abort trap: 6 error. I bisected to a5274cd in the linked issue.

  5. inventshah commented on Aug 10, 2025

    @inventshah
    inventshah
    on Aug 10, 2025
    Contributor

    Confirmed it has the same bad commit.

    Built with -enable-experimental-jit=yes-off --with-lto=full --enable-optimizations from a5274cd and:

    git clone https://github.com/MatthieuDartiailh/pyclibrary.git
cd pyclibrary

python3.14 -m venv venv
source venv/bin/activate
python -m pip install . pytest-cov pytest 
python -m pytest tests --cov pyclibrary --cov-report xml -v tests/backends/test_ctypes.py::TestCTypesCLibrary::test_call

    Causes Abort trap: 6

  6. AA-Turner commented on Aug 11, 2025

    @AA-Turner
    AA-Turner
    on Aug 11, 2025
    Member

    @inventshah are you able to minimise the crash-causing-code? Ideally without using pytest, and even better if only using stdlib modules.

    A

  7. MatthieuDartiailh commented on Aug 11, 2025

    @MatthieuDartiailh
    MatthieuDartiailh
    on Aug 11, 2025
    ContributorAuthor

    @inventshah provided a minimal reproducer in #137573 (comment)

  8. AA-Turner commented on Aug 11, 2025

    @AA-Turner
    AA-Turner
    on Aug 11, 2025
    Member

    Missed that, sorry. I'll close this as a duplicate of #137573.

  9. AA-Turner
    closed this as a duplicateof Stack overflow error from recursion with 3.14.0rc1 on MacOS #137573 on Aug 11, 2025
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