Index: test/tsan/signal_recursive.cc
===================================================================
--- test/tsan/signal_recursive.cc
+++ test/tsan/signal_recursive.cc
@@ -119,6 +119,7 @@
   Init();
   pthread_t busy_thread;
   pthread_create(&busy_thread, NULL, &BusyThread, NULL);
+  sleep(1); // Tsan deadlocks on FreeBSD under high load without this sleep
   CollectGarbage(busy_thread);
   pthread_join(busy_thread, 0);
   fprintf(stderr, "DONE\n");