1 files changed, 40 insertions, 0 deletions
diff --git a/test/tsan/cond_race.cc b/test/tsan/cond_race.cc
new file mode 100644
index 000000000000..fa42fafca4d2
--- /dev/null
+++ b/test/tsan/cond_race.cc
@@ -0,0 +1,40 @@
+// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+// CHECK-NOT: unlock of unlocked mutex
+// CHECK: ThreadSanitizer: data race
+// CHECK: pthread_cond_signal
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <unistd.h>
+
+struct Ctx {
+  pthread_mutex_t m;
+  pthread_cond_t c;
+  bool done;
+};
+
+void *thr(void *p) {
+  Ctx *c = (Ctx*)p;
+  pthread_mutex_lock(&c->m);
+  c->done = true;
+  pthread_mutex_unlock(&c->m);
+  pthread_cond_signal(&c->c);
+  return 0;
+}
+
+int main() {
+  Ctx *c = new Ctx();
+  pthread_mutex_init(&c->m, 0);
+  pthread_cond_init(&c->c, 0);
+  pthread_t th;
+  pthread_create(&th, 0, thr, c);
+  pthread_mutex_lock(&c->m);
+  while (!c->done)
+    pthread_cond_wait(&c->c, &c->m);
+  pthread_mutex_unlock(&c->m);
+  // w/o this sleep, it can be reported as use-after-free
+  sleep(1);
+  delete c;
+  pthread_join(th, 0);
+}