https://github.com/python/cpython/commit/ac539e7e0d1622c61988f30c91acfd4c06521ced
commit: ac539e7e0d1622c61988f30c91acfd4c06521ced
branch: main
author: Kumar Aditya <kumaradi...@python.org>
committer: kumaraditya303 <kumaradi...@python.org>
date: 2025-05-27T22:42:08+05:30
summary:
gh-132917: fix data race on `last_mem` in free-threading gc (#134692)
files:
M Python/gc_free_threading.c
diff --git a/Python/gc_free_threading.c b/Python/gc_free_threading.c
index d2ea5b5e06ba43..5aaa68c5b51f95 100644
--- a/Python/gc_free_threading.c
+++ b/Python/gc_free_threading.c
@@ -2062,7 +2062,7 @@ gc_should_collect_mem_usage(GCState *gcstate)
// 70,000 new container objects.
return true;
}
- Py_ssize_t last_mem = gcstate->last_mem;
+ Py_ssize_t last_mem = _Py_atomic_load_ssize_relaxed(&gcstate->last_mem);
Py_ssize_t mem_threshold = Py_MAX(last_mem / 10, 128);
if ((mem - last_mem) > mem_threshold) {
// The process memory usage has increased too much, do a collection.
@@ -2245,7 +2245,8 @@ gc_collect_internal(PyInterpreterState *interp, struct
collection_state *state,
// Store the current memory usage, can be smaller now if breaking cycles
// freed some memory.
- state->gcstate->last_mem = get_process_mem_usage();
+ Py_ssize_t last_mem = get_process_mem_usage();
+ _Py_atomic_store_ssize_relaxed(&state->gcstate->last_mem, last_mem);
// Append objects with legacy finalizers to the "gc.garbage" list.
handle_legacy_finalizers(state);
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