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GeezerVison is showing github.com — Data race of `should_auto_add_history` in file `Modules/readline.c` · Issue #154539 · python/cpython

Data race of should_auto_add_history in file Modules/readline.c #154539

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Data race of should_auto_add_history in file Modules/readline.c#154539
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extension-modulesC modules in the Modules dirC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@xxyzz
xxyzz
opened on Jul 23, 2026
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Bug report

Bug description:

Read and write of variable should_auto_add_history in file Modules/readline.c is not atomic, thus could be data race in free thread build. For detailed report please see TSAN-0025 from the parent issue #153852.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

  • gh-154539: Use atomic read and write with should_auto_add_history #154531

Activity

  1. xxyzz
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on Jul 23, 2026
  2. xxyzz
    added a commit that references this issue on Jul 23, 2026

    pythongh-154539: Use atomic read and write with `should_auto_add_hist…

    4be5829
  3. picnixz
    added
    extension-modulesC modules in the Modules dirC modules in the Modules dir
    on Jul 24, 2026
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    extension-modulesC modules in the Modules dirC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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