tsan: disable flaky mmap_stress test

llvm-svn: 259650

Author: dvyukov

compiler-rt/test/tsan/mmap_stress.cc

@@ -47,6 +47,10 @@ void *Worker(void *arg) {
 }
 
 int main() {
+  // This test is flaky on several builders:
+  // https://groups.google.com/d/msg/llvm-dev/KUFPdLhBN3Q/L75rwW9xBgAJ
+  // The cause is unknown (lit hides test output on failures).
+#if 0
   pthread_t th[4];
   for (int i = 0; i < 4; i++) {
     if (pthread_create(&th[i], 0, Worker, 0))
@@ -56,6 +60,7 @@ int main() {
     if (pthread_join(th[i], 0))
       exit(printf("pthread_join failed: %d\n", errno));
   }
+#endif
   fprintf(stderr, "DONE\n");
 }