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[3.15] gh-159285: Fix crash when copying an empty dict fails with MemoryError (GH-159286) - #159287
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…ryError (pythonGH-159286) copy_lock_held_untracked() asserted that the new empty dict was not tracked by the GC without checking whether its allocation had failed, so a debug build dereferenced NULL instead of raising MemoryError. This affected dict.copy(), PyDict_Copy() and _PyDict_CopyAsDict(), which type() uses for the class namespace. (cherry picked from commit f9132f1) Co-authored-by: Christian Aurich Zanettini Martins <christian.aurichzm@gmail.com>
methane
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Oct 13, 2026
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copy_lock_held_untracked() asserted that the new empty dict was not
tracked by the GC without checking whether its allocation had failed,
so a debug build dereferenced NULL instead of raising MemoryError. This
affected dict.copy(), PyDict_Copy() and _PyDict_CopyAsDict(), which
type() uses for the class namespace.
(cherry picked from commit f9132f1)
Co-authored-by: Christian Aurich Zanettini Martins christian.aurichzm@gmail.com