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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"bltinmodule.c: lazy_import NULL deref without Python frame","articleBody":"# Crash report\n\n### What happened?\n\nOriginal gist: https://gist.github.com/devdanzin/cc84f43d7a5c774b47551060c061391f. A PR is on the way.\n\n## Summary\n\n`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.\n\n## Fix\n\nAdd NULL check for `globals` after `PyEval_GetGlobals()`.\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\n_No response_\n\n### Output from running 'python -VV' on the command line:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-151511\n* gh-151610\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/aisk","@type":"Person","name":"aisk"},"datePublished":"2026-06-15T15:45:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/151510/cpython/issues/151510"}