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Crash because of ownership assert in PyObject_ClearManagedDict #152254
Description
Crash report
Refs #151763
Original description: https://gist.github.com/devdanzin/99b84915b197ae0ade7face262b8af66
Repro:
from unittest.mock import MagicMock
from _testcapi import set_nomemory
set_nomemory(200) # fail allocations from the 200th onward (lands in shutdown GC)
(MagicMock(), undefined_name) # build a MagicMock (managed __dict__), then NameError abandons
# it into a traceback cycle -> survives to shutdown GCI have a fix ready.
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