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GeezerVison is showing github.com — Modifying offsets of existing members in _gc_runtime_state is probably a bad idea · Issue #149242 · python/cpython

Modifying offsets of existing members in _gc_runtime_state is probably a bad idea #149242

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Modifying offsets of existing members in _gc_runtime_state is probably a bad idea#149242
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interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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@DinoV
DinoV
opened on May 1, 2026
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Bug report

Bug description:

The offset of _gc_runtime_state is exported via the debug offsets, but only offset within it is exported. It's likely that someone could be doing something slimey like looking at other fields. init. It's probably best to only add things to the end rather than change the offsets of existing members of the struct in a patch release.

CPython versions tested on:

3.14

Operating systems tested on:

No response

Linked PRs

  • [3.14] gh-149242: Heap size should be added at end of the struct  #149241

Activity

  1. DinoV
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on May 1, 2026
  2. StanFromIreland
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)
    on May 1, 2026
  3. DinoV
    added a commit that references this issue on May 1, 2026

    [3.14] gh-149242: Heap size should be added at end of the struct (#14…

    312a596
  4. DinoV
    closed this as completedon May 2, 2026
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    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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