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array iterator segfault on __setstate__() when exhausted #128961

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array iterator segfault on __setstate__() when exhausted#128961
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extension-modulesC modules in the Modules dirtype-crashA hard crash of the interpreter, possibly with a core dump

Description

@tom-pytel
tom-pytel
opened on Jan 17, 2025

Crash report

What happened?

>>> import array
... a = array.array('i')
... it = iter(a)
... list(it)
... it.__setstate__(0)
... 
Segmentation fault (core dumped)

This goes back at least to py 3.8 (checked on that one), PR fix incoming.

CPython versions tested on:

3.14

Operating systems tested on:

Linux

Output from running 'python -VV' on the command line:

Python 3.14.0a4+ (heads/arrayiter:7d97bc8eda, Jan 17 2025, 16:24:27) [GCC 11.4.0]

Linked PRs

Activity

  1. tom-pytel
    added
    type-crashA hard crash of the interpreter, possibly with a core dump
    on Jan 17, 2025
  2. tom-pytel
    added a commit that references this issue on Jan 17, 2025

    pythongh-128961: fix array iterator segfault on __setstate__

    7831074

  3. tom-pytel commented on Jan 17, 2025

    @tom-pytel
    tom-pytel
    on Jan 17, 2025
    ContributorAuthor

    Ping @erlend-aasland

  4. tom-pytel
    added a commit that references this issue on Jan 17, 2025

    test raise StopIteration after pythongh-128961

    8eab735
  5. picnixz
    added
    extension-modulesC modules in the Modules dir
    on Jan 18, 2025
  6. erlend-aasland
    added a commit that references this issue on Jan 18, 2025

    gh-128961: Fix exhausted array iterator crash in __setstate__() (#128962

    4dade05
  7. miss-islington
    added 2 commits that reference this issue on Jan 18, 2025

    pythongh-128961: Fix exhausted array iterator crash in __setstate__() (…

    29cbdab

    pythongh-128961: Fix exhausted array iterator crash in __setstate__() (…

    bf59715

  8. erlend-aasland commented on Jan 18, 2025

    @erlend-aasland
    erlend-aasland
    on Jan 18, 2025
    Contributor

    Fixed with:

    Auto-merge enabled for the backports. Closing as resolved. Thanks for identifying the bug and fixing it, Tomasz!

  9. erlend-aasland
    closed this as completedon Jan 18, 2025

  10. erlend-aasland commented on Jan 18, 2025

    @erlend-aasland
    erlend-aasland
    on Jan 18, 2025
    Contributor

    For the record: this was discovered while the OP was working on #128943.

  11. erlend-aasland
    added 2 commits that reference this issue on Jan 18, 2025

    [3.12] gh-128961: Fix exhausted array iterator crash in __setstate__() (

    405f6d7

    [3.13] gh-128961: Fix exhausted array iterator crash in __setstate__() (

    c75894a
  12. srinivasreddy
    added a commit that references this issue on Jan 21, 2025

    pythongh-128961: Fix exhausted array iterator crash in __setstate__() (…

    e0f3786
  13. serhiy-storchaka
    added this to Struct, memoryview and array issues 🏗️on Jul 13, 2026
  14. github-project-automation
    moved this to Todo in Struct, memoryview and array issues 🏗️on Jul 13, 2026
  15. github-project-automation
    moved this from Todo to Done in Struct, memoryview and array issues 🏗️on Jul 13, 2026
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