[Python-checkins] gh-132643: use atomic load for dict in specializer (#132653)

[kumaraditya303]

https://github.com/python/cpython/commit/f3d877a27abca355f9d05decf3e2ce0874983288
commit: f3d877a27abca355f9d05decf3e2ce0874983288
branch: main
author: Kumar Aditya <kumaradi...@python.org>
committer: kumaraditya303 <kumaradi...@python.org>
date: 2025-04-18T15:06:27+05:30
summary:

gh-132643: use atomic load for dict in specializer (#132653)

files:
M Python/specialize.c

diff --git a/Python/specialize.c b/Python/specialize.c
index ceb396c5b54815..48cdcbd2a24cab 100644
--- a/Python/specialize.c
+++ b/Python/specialize.c
@@ -1641,7 +1641,8 @@ specialize_attr_loadclassattr(PyObject *owner, 
_Py_CODEUNIT *instr,
             specialize(instr, is_method ? LOAD_ATTR_METHOD_NO_DICT : 
LOAD_ATTR_NONDESCRIPTOR_NO_DICT);
         }
         else if (is_method) {
-            PyObject *dict = *(PyObject **) ((char *)owner + dictoffset);
+            PyObject **addr = (PyObject **)((char *)owner + dictoffset);
+            PyObject *dict = FT_ATOMIC_LOAD_PTR_ACQUIRE(*addr);
             if (dict) {
                 SPECIALIZATION_FAIL(LOAD_ATTR, 
SPEC_FAIL_ATTR_NOT_MANAGED_DICT);
                 return 0;

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