Description

markshannon

opened on Sep 24, 2025

Issue body actions

Bug description:

Largely as a result of mixing the logic for determining the hardware stack limits and for setting the software stack limits, the incorrect hard limit is set for both TSAN and MacOS. MacOS is too low by _PyOS_STACK_MARGIN_BYTES and for TSAN by half the stack size.

Linked PRs

• GH-139291: Fix C stack limits by factoring out finding hardware stack limits #139294

Activity

1. markshannon

   added

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

   on Sep 24, 2025
2. picnixz

   added

   OS-mac

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

   on Sep 24, 2025
3. encukou

   added a commit that references this issue on Oct 7, 2025

   GH-139291: Fix C stack limits by factoring out finding hardware stack…

   7094f09
4. StanFromIreland commented on Oct 8, 2025

   

   StanFromIreland

   on Oct 8, 2025

   Member

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   Triage: Can this be closed as completed?
5. StanFromIreland

   added

   pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

   on Oct 8, 2025
6. encukou commented on Oct 9, 2025

   

   encukou

   on Oct 9, 2025

   Member

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   Yeah. 3.14 doesn't have macOS-specific code, and TSAN is OK on buildbots.
   This might need a backport if a 3.14.1 fix depends on it, but let's close the issue.
7. encukou

   closed this as completedon Oct 9, 2025
8. thesamesam commented on Oct 9, 2025

   

   thesamesam

   on Oct 9, 2025

   Contributor

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   We're having some issues on HPPA with the stack protection code w/ 3.14, I haven't debugged it enough to file a bug (and likely send a patch if it is what I think it is) yet, but backporting changes to the code would be appreciated in case:
   a) it fixes it, and/or
   b) to avoid complications in backporting other fixes,
   if it's known to fix some problem already.

   EDIT: .. that issue is now filed as #139914.

   Reacted by Petr Viktorin
9. encukou

   added a commit that references this issue on Nov 17, 2025

   pythonGH-139291: Fix C stack limits by factoring out finding hardware…

   0300367
10. hroncok

    added a commit that references this issue on Nov 24, 2025

    pythonGH-139291: Fix C stack limits by factoring out finding hardware…

    42e7abe

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