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GeezerVison is showing github.com — pylifecycle.c: Multiple init/fini cleanup bugs · Issue #149630 · python/cpython

pylifecycle.c: Multiple init/fini cleanup bugs #149630

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pylifecycle.c: Multiple init/fini cleanup bugs#149630
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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

Description

@Wulian233
Wulian233
opened on May 10, 2026
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Bug report

Bug description:

Parent: #146102

https://gist.github.com/devdanzin/b022ff2d1304a4b2b8d3d8750abd8da5

pylifecycle.c: Multiple init/fini cleanup bugs

Summary

5 bugs in interpreter lifecycle:

  1. new_interpreter (line 2534): return status bypasses switch-back after save_tstate detach → thread state corruption.
  2. pycore_init_builtins (line 860): Direct return leaks bimod ref.
  3. add_main_module (line 2762): bimod/loader refs leaked on PyDict_SetItemString failure.
  4. finalize_clear_modules_dict (line 1685): Return value of PyObject_CallMethodNoArgs never DECREF'd.
  5. init_sys_streams (line 3019-3031): Unchecked PySys_SetObject for stdin/stdout (stderr correctly checked).

CPython versions tested on:

CPython main branch, 3.15

Operating systems tested on:

No response

Linked PRs

  • gh-149630: Fix pylifecycle multiple init/fini cleanup bugs  #149631

Activity

  1. Wulian233
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on May 10, 2026
  2. picnixz
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)
    on May 10, 2026
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