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Build fails with Py_STACKREF_DEBUG set. #135125

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Build fails with Py_STACKREF_DEBUG set.#135125
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buildThe build process and cross-buildinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

Description

@markshannon
markshannon
opened on Jun 4, 2025

Bug report

Bug description:

I think this is a relatively recent regression, probably in the last month or so.

Can be reproduced by uncommenting the line:

// #define Py_STACKREF_DEBUG 1

in pycore_structs.h

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

Activity

  1. markshannon
    added
    type-bugAn unexpected behavior, bug, or error
    on Jun 4, 2025

  2. markshannon commented on Jun 6, 2025

    @markshannon
    markshannon
    on Jun 6, 2025
    MemberAuthor

    Bisected to 6dcb0fd

  3. picnixz
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    buildThe build process and cross-build
    on Jun 7, 2025

  4. efimov-mikhail commented on Oct 1, 2025

    @efimov-mikhail
    efimov-mikhail
    on Oct 1, 2025
    Member

    Bisected to 6dcb0fd

    Yes, problem was introduced here, _PyStackRef_FromPyObjectBorrow is incorrect on mortal objects in PyStackRef debug mode.

  5. markshannon
    added a commit that references this issue on Oct 23, 2025

    gh-135125: Fix Py_STACKREF_DEBUG build (GH-139475)

    918a9ac
  6. efimov-mikhail
    closed this as completedon Oct 25, 2025
  7. StanFromIreland
    added a commit that references this issue on Dec 6, 2025

    pythongh-135125: Fix Py_STACKREF_DEBUG build (pythonGH-139475)

    02e31d5
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    buildThe build process and cross-buildinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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