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GeezerVison is showing github.com — bltinmodule.c: lazy_import NULL deref without Python frame · Issue #151510 · python/cpython

bltinmodule.c: lazy_import NULL deref without Python frame #151510

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bltinmodule.c: lazy_import NULL deref without Python frame#151510
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interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)topic-lazy-importstype-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Description

@aisk
aisk
opened on Jun 15, 2026
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Crash report

What happened?

Original gist: https://gist.github.com/devdanzin/cc84f43d7a5c774b47551060c061391f. A PR is on the way.

Summary

builtin___lazy_import___impl (line 321): When globals=NULL and PyEval_GetGlobals() returns NULL (no Python frame), PyDict_Check(globals) dereferences NULL → segfault. Reachable from embedded interpreters.

Fix

Add NULL check for globals after PyEval_GetGlobals().

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

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

No response

Linked PRs

  • gh-151510: Fix __lazy_import__ without frame #151511
  • [3.15] gh-151510: Fix __lazy_import__ without frame (GH-151511) #151610

Activity

  1. aisk
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)
    type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump
    topic-lazy-imports
    on Jun 15, 2026
  2. aisk
    added a parent issue on Jun 15, 2026
    • Umbrella issue: bugs found using cpython-review-toolkit #146102
  3. pablogsal
    added a commit that references this issue on Jun 17, 2026

    gh-151510: Fix __lazy_import__ without frame (#151511)

    eff805b
  4. pablogsal
    closed this as completedon Jun 17, 2026
  5. pablogsal
    added a commit that references this issue on Jun 17, 2026

    [3.15] gh-151510: Fix __lazy_import__ without frame (GH-151511) (#151610

    8fe5897
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    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)topic-lazy-importstype-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

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