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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 dirtopic-free-threadingtype-bugAn unexpected behavior, bug, or error

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@xxyzz
xxyzz
opened on Jul 24, 2026

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

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  1. xxyzz
    added
    type-bugAn 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
  4. StanFromIreland
    added
    extension-modulesC 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
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