1 files changed, 41 insertions, 0 deletions
diff --git a/lib/tsan/lit_tests/mutex_robust2.cc b/lib/tsan/lit_tests/mutex_robust2.cc
new file mode 100644
index 000000000..5bd7ff682
--- /dev/null
+++ b/lib/tsan/lit_tests/mutex_robust2.cc
@@ -0,0 +1,41 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && not %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+
+pthread_mutex_t m;
+int x;
+
+void *thr(void *p) {
+  pthread_mutex_lock(&m);
+  x = 42;
+  return 0;
+}
+
+int main() {
+  pthread_mutexattr_t a;
+  pthread_mutexattr_init(&a);
+  pthread_mutexattr_setrobust(&a, PTHREAD_MUTEX_ROBUST);
+  pthread_mutex_init(&m, &a);
+  pthread_t th;
+  pthread_create(&th, 0, thr, 0);
+  sleep(1);
+  if (pthread_mutex_trylock(&m) != EOWNERDEAD) {
+    fprintf(stderr, "not EOWNERDEAD\n");
+    exit(1);
+  }
+  x = 43;
+  pthread_join(th, 0);
+  fprintf(stderr, "DONE\n");
+}
+
+// This is a false positive, tsan must not bark at the data race.
+// But currently it does.
+// CHECK-NOT: WARNING: ThreadSanitizer WARNING: double lock of mutex
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK-NOT: EOWNERDEAD
+// CHECK: DONE
+// CHECK-NOT: WARNING: ThreadSanitizer
+