--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/compiler-rt/test/tsan/race_on_barrier.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,34 @@
+// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+
+// pthread barriers are not available on OS X
+// UNSUPPORTED: darwin
+
+#include "test.h"
+
+pthread_barrier_t B;
+int Global;
+
+void *Thread1(void *x) {
+  pthread_barrier_init(&B, 0, 2);
+  barrier_wait(&barrier);
+  pthread_barrier_wait(&B);
+  return NULL;
+}
+
+void *Thread2(void *x) {
+  barrier_wait(&barrier);
+  pthread_barrier_wait(&B);
+  return NULL;
+}
+
+int main() {
+  barrier_init(&barrier, 2);
+  pthread_t t;
+  pthread_create(&t, NULL, Thread1, NULL);
+  Thread2(0);
+  pthread_join(t, NULL);
+  pthread_barrier_destroy(&B);
+  return 0;
+}
+
+// CHECK:      WARNING: ThreadSanitizer: data race