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gh-144295: Fix data race in dict method lookup and global load#144312
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In `_PyDict_GetMethodStackRef`, only use the fast-path unicode lookupwhen the dict is owned by the current thread or already marked as shared.This prevents a race between the lookup and concurrent dict resizes,which may free the PyDictKeysObject (i.e., it ensures that the resizeuses QSBR).Address a similar issue in `_Py_dict_lookup_threadsafe_stackref` bycalling `ensure_shared_on_read()`.
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In
_PyDict_GetMethodStackRef, only use the fast-path unicode lookup when the dict is owned by the current thread or already marked as shared. This prevents a race between the lookup and concurrent dict resizes, which may free the PyDictKeysObject (i.e., it ensures that the resize uses QSBR).Address a similar issue in
_Py_dict_lookup_threadsafe_stackrefby callingensure_shared_on_read().new_keys_objectindictobject.c#144295