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Data races with frame objects #144446

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Data races with frame objects#144446
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3.16new features, bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)topic-free-threadingtype-bugAn unexpected behavior, bug, or error

Description

@colesbury
colesbury
opened on Feb 3, 2026

Bug report

We've fixed most of the data races with Python frame objects in:

But I think we missed a few places, such as:

  • repr(frame) on an frame that is executing or in the process of getting cleared
  • frame.f_lasti
  • Accessing variables through frame.f_locals

Additionally, I'd like to add more free threading tests for frames.

Linked PRs

Activity

  1. colesbury
    added
    type-bugAn unexpected behavior, bug, or error
    topic-free-threading
    3.14bugs and security fixes
    3.15bugs and security fixes
    on Feb 3, 2026
  2. colesbury
    added 2 commits that reference this issue on Feb 4, 2026

    pythongh-144446: Fix some frame object thread-safety issues

    25f9328

    gh-144446: Fix some frame object thread-safety issues (gh-144479)

    5bb3bbb
  3. miss-islington
    added a commit that references this issue on Feb 6, 2026

    pythongh-144446: Fix some frame object thread-safety issues (pythongh…

    d92a7fb
  4. colesbury
    added a commit that references this issue on Feb 6, 2026

    [3.14] gh-144446: Fix some frame object thread-safety issues (gh-144479…

    6006005
  5. thunder-coding
    added a commit that references this issue on Feb 15, 2026

    pythongh-144446: Fix some frame object thread-safety issues (pythongh…

    5f30178

  6. LindaSummer commented on Feb 24, 2026

    @LindaSummer
    LindaSummer
    on Feb 24, 2026
    Contributor

    Hi @colesbury ,
    I want to work on the Accessing variables through frame.f_locals sub issue.
    Could I try this sub-task? 😊

  7. colesbury commented on Feb 24, 2026

    @colesbury
    colesbury
    on Feb 24, 2026
    ContributorAuthor

    Thanks @LindaSummer, but I've already started on it. I'll open a draft PR with the changes. Still thinking about if this is the way I want to implement it.

  8. colesbury
    added 2 commits that reference this issue on Feb 24, 2026

    pythongh-144446: Fix thread-safety of FrameLocalsProxy on executing f…

    2f3e916

    pythongh-144446: Fix thread-safety of FrameLocalsProxy on executing f…

    a243a4b
  9. ljfp
    added a commit that references this issue on Apr 25, 2026

    pythongh-144446: Fix some frame object thread-safety issues (pythongh…

    773fb83
  10. kumaraditya303
    added 2 commits that reference this issue on Aug 19, 2026

    pythongh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame…

    b7c16bb

    pythongh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame…

    4b614d3
  11. kumaraditya303
    added a commit that references this issue on Sep 2, 2026

    gh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame in fr…

    db92901
  12. vstinner
    added 2 commits that reference this issue on Sep 3, 2026

    pythongh-144446: Fix _PyFrame_GetFrameObject() for test_cppext (C++)

    633171b

    gh-144446: Fix _PyFrame_GetFrameObject() for test_cppext (C++) (#156893)

    4dd225e
  13. kumaraditya303
    added 5 commits that reference this issue on Sep 5, 2026

    pythongh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame…

    5111a63

    pythongh-144446: Fix thread-safety of FrameLocalsProxy on executing f…

    9edbfb1

    pythongh-144446: Fix thread-safety of FrameLocalsProxy on executing f…

    9b16c6e

    pythongh-144446: Fix thread-safety of FrameLocalsProxy on executing f…

    cc281e3

    pythongh-144446: Fix thread-safety of FrameLocalsProxy on executing f…

    44c1536
  14. kumaraditya303
    added
    3.16new features, bugs and security fixes
    and removed
    3.14bugs and security fixes
    3.15bugs and security fixes
    on Sep 5, 2026
  15. picnixz
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on Sep 6, 2026
  16. clin1234
    added 2 commits that reference this issue on Sep 12, 2026

    pythongh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame…

    b13e00b

    pythongh-144446: Fix _PyFrame_GetFrameObject() for test_cppext (C++) (p…

    0bcdddd
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    3.16new features, bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)topic-free-threadingtype-bugAn unexpected behavior, bug, or error

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