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In the following programs, we call check_reentrant_insertion("s") twice, after multiple of update and clear of dict, the Python interpreter crashes.
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def check_reentrant_insertion(mutate):
 class Mutating:
 def __del__(self):
 mutate(d)
 d = {k: Mutating() for k in 'abcdefghijklmnopqr'}
 for k in list(d):
 d[k] = k
def test_reentrant_insertion():
 check_reentrant_insertion("s")
 def mutate(d):
 d.update(DictTest.__dict__)
 d.clear()
 check_reentrant_insertion(test_reentrant_insertion())
test_reentrant_insertion()
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System Info: Ubuntu 16.04
Python Version: Python 3.9.1