1 files changed, 38 insertions, 0 deletions
diff --git a/test/tsan/inlined_memcpy_race.cc b/test/tsan/inlined_memcpy_race.cc
new file mode 100644
index 000000000000..a95576a83c9a
--- /dev/null
+++ b/test/tsan/inlined_memcpy_race.cc
@@ -0,0 +1,38 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+#include <pthread.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+int x[4], z[4];
+
+void *MemCpyThread(void *a) {
+  memcpy((int*)a, z, 16);
+  return NULL;
+}
+
+void *MemSetThread(void *a) {
+  sleep(1);
+  memset((int*)a, 0, 16);
+  return NULL;
+}
+
+int main() {
+  pthread_t t[2];
+  // Race on x between memcpy and memset
+  pthread_create(&t[0], NULL, MemCpyThread, x);
+  pthread_create(&t[1], NULL, MemSetThread, x);
+  pthread_join(t[0], NULL);
+  pthread_join(t[1], NULL);
+  printf("PASS\n");
+  return 0;
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK:   #0 memset
+// CHECK:   #1 MemSetThread
+// CHECK:  Previous write
+// CHECK:   #0 memcpy
+// CHECK:   #1 MemCpyThread
+