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GeezerVison is showing github.com — Data race in `Modules/cjkcodecs/multibytecodec.c` · Issue #154577 · python/cpython

Data race in Modules/cjkcodecs/multibytecodec.c #154577

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Data race in Modules/cjkcodecs/multibytecodec.c#154577
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extension-modulesC modules in the Modules dirC modules in the Modules dirtopic-free-threadingtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@xxyzz
xxyzz
opened on Jul 24, 2026
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Bug report

Bug description:

Functions have MultibyteIncrementalEncoderObject and MultibyteIncrementalDecoderObject argument are not using @critical_section, therefore could have data race on these objects. For more details please see the TSAN-0001 report from parent issue #153852.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

  • gh-154577: Fix data race in Modules/cjkcodecs/multibytecodec.c #154578

Activity

  1. xxyzz
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on Jul 24, 2026
  2. xxyzz
    added a commit that references this issue on Jul 24, 2026

    pythongh-154577: Fix data race in `Modules/cjkcodecs/multibytecodec.c`

    f7625e0
  3. StanFromIreland
    added a parent issue on Jul 25, 2026
    • Free-threading data races in CPython: 15 findings (9 new + 6 residual of existing FT work) #153852
  4. StanFromIreland
    added
    extension-modulesC modules in the Modules dirC modules in the Modules dir
    on Jul 25, 2026
  5. StanFromIreland
    added this to Codecs and encodings issueson Jul 25, 2026
  6. StanFromIreland
    added
    topic-free-threading
    on Jul 25, 2026
  7. xxyzz
    added a commit that references this issue on Jul 26, 2026

    pythongh-154577: Fix data race in `Modules/cjkcodecs/multibytecodec.c`

    3ba7336
  8. github-project-automation
    added this to Project_VKon Oct 18, 2026
  9. github-project-automation
    moved this to Todo in Project_VKon Oct 18, 2026
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    extension-modulesC modules in the Modules dirC modules in the Modules dirtopic-free-threadingtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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    • Codecs and encodings issues
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