Found here, but this crash is unrelated, so opening a new issue.
The following could be simplified, but it crashes because PyDict_Next creates borrowed references.
import pickle
from random import getrandbits
class Bad:
def __eq__(self, other):
if not ENABLED:
return False
break_things()
return getrandbits(4) == 0
def __hash__(self):
return getrandbits(1)
def __reduce__(self):
break_things()
return (Bad, (), ())
def __setstate__(self, *args):
break_things()
def __del__(self):
break_things()
def __getattr__(self):
break_things()
def break_things():
if getrandbits(6) == 0:
collection.clear()
TRIALS = 10_000
SIZE = 50
for i in range(TRIALS):
try:
ENABLED = False
collection = {Bad():Bad() for _ in range(SIZE)}
for bad in collection:
bad.bad = bad
bad.collection = collection
ENABLED = True
pickle.loads(pickle.dumps(collection))
except RuntimeError as e:
assert "changed size during iteration" in str(e)
print("ok")
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Found here, but this crash is unrelated, so opening a new issue.
The following could be simplified, but it crashes because PyDict_Next creates borrowed references.