Description

colesbury

opened on Feb 3, 2026

Issue body actions

Bug report

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

• data races in frame inspection and tracebacks #128421

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

• gh-144446: Fix some frame object thread-safety issues #144479
• [3.14] gh-144446: Fix some frame object thread-safety issues (gh-144479) #144546
• gh-144446: Fix thread-safety of FrameLocalsProxy on executing frames #145183
• gh-144446: Fix thread safety of gi_frame, cr_frame and ag_frame in free-threading #156037
• gh-144446: Fix _PyFrame_GetFrameObject() for test_cppext (C++) #156893
• gh-144446: Fix thread-safety of FrameLocalsProxy on executing frames #156973

Activity

1. colesbury

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   topic-free-threading

   3.14bugs and security fixesbugs and security fixes

   3.15bugs and security fixesbugs 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

   on Feb 24, 2026

   Contributor

   More actions

   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

   on Feb 24, 2026

   ContributorAuthor

   More actions

   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.

   Reacted by Edward Xu
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 a commit that references this issue on Aug 19, 2026

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

    b7c16bb
11. 1 remaining item
12. 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
13. 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
14. 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
15. kumaraditya303

    added

    3.16new features, bugs and security fixesnew features, bugs and security fixes

    and removed

    3.14bugs and security fixesbugs and security fixes

    3.15bugs and security fixesbugs and security fixes

    on Sep 5, 2026
16. picnixz

    added

    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

    on Sep 6, 2026
17. 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
18. kumaraditya303

    added a commit that references this issue on Nov 9, 2026

    Merge branch 'main' of https://github.com/python/cpython into pythong…

    e94a203

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