gh-158820: Add null checks to avoid segfaults with lazy imports at shutdown - #158821
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Destructors can run after finalization has cleared the interpreter's lazy_modules set and lazy_pending_submodules dict. Declaring or resolving a lazy import from one of them passed NULL to PySet_Add(), PySet_Discard() or the pending-submodules lookup. Treat the bookkeeping as a no-op once the state is gone, as the other readers of this state already do.
brittanyrey
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ericsnowcurrently,
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pablogsal and
warsaw
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October 5, 2026 01:57
pablogsal
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Oct 5, 2026
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October 5, 2026 21:18
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Additional finalizers can run after
finalize_modules()has cleared the interpreter'slazy_modulesset andlazy_pending_submodulesdict. In the perfect storm, this can lead to a seg fault when accessing either container without checking if the object is still allocated.