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[3.14] gh-144295: Fix data race in dict method lookup and global load (gh-144312)#144346
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…l load (pythongh-144312)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()`.(cherry picked from commite666a01)Co-authored-by: Sam Gross <colesbury@gmail.com>
06f9c8c intopython:3.14 51 checks passed
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In
_Py_dict_lookup_threadsafe_stackref, callensure_shared_on_read()toprevent a race between the lookup and concurrent dict resizes, which may free
the PyDictKeysObject (i.e., it ensures that the resize uses QSBR).
(cherry picked from commite666a01)
new_keys_objectindictobject.c#144295