[Python-checkins] gh-126366: fix thread safety of dict key iterator (#132693)

[kumaraditya303]

https://github.com/python/cpython/commit/4c3d187d9f143eee930a88a38b90f4842911b8be
commit: 4c3d187d9f143eee930a88a38b90f4842911b8be
branch: main
author: Kumar Aditya <kumaradi...@python.org>
committer: kumaraditya303 <kumaradi...@python.org>
date: 2025-04-18T21:43:49+05:30
summary:

gh-126366: fix thread safety of dict key iterator (#132693)

files:
M Objects/dictobject.c

diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 792a34cc569fe8..ff6dbb8bed3007 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -5495,7 +5495,7 @@ dictiter_iternext_threadsafe(PyDictObject *d, PyObject 
*self,
     ensure_shared_on_read(d);
 
     i = _Py_atomic_load_ssize_relaxed(&di->di_pos);
-    k = _Py_atomic_load_ptr_relaxed(&d->ma_keys);
+    k = _Py_atomic_load_ptr_acquire(&d->ma_keys);
     assert(i >= 0);
     if (_PyDict_HasSplitTable(d)) {
         PyDictValues *values = _Py_atomic_load_ptr_relaxed(&d->ma_values);

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