From: Kumar Aditya <kumaraditya@python.org>
Date: Fri, 18 Apr 2025 09:36:27 +0000 (+0530)
Subject: gh-132643: use atomic load for dict in specializer (#132653)
X-Git-Tag: v3.14.0b1~423
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f3d877a27abca355f9d05decf3e2ce0874983288;p=thirdparty%2FPython%2Fcpython.git

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

diff --git a/Python/specialize.c b/Python/specialize.c
index ceb396c5b548..48cdcbd2a24c 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;