diff --git a/lib/msan/lit_tests/sync_lock_set_and_test.cc b/lib/msan/lit_tests/sync_lock_set_and_test.cc
new file mode 100644
index 0000000..1023b3e
--- /dev/null
+++ b/lib/msan/lit_tests/sync_lock_set_and_test.cc
@@ -0,0 +1,7 @@
+// RUN: %clangxx_msan -m64 -O0 %s -o %t && %t
+
+int main(void) {
+  int i;
+  __sync_lock_test_and_set(&i, 0);
+  return i;
+}