diff --git a/compiler-rt/test/sanitizer_common/TestCases/Posix/create_thread_loop.cpp b/compiler-rt/test/sanitizer_common/TestCases/Posix/create_thread_loop.cpp
--- a/compiler-rt/test/sanitizer_common/TestCases/Posix/create_thread_loop.cpp
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/create_thread_loop.cpp
@@ -2,8 +2,8 @@
 
 // RUN: %clangxx -O3 -pthread %s -o %t && %run %t 1000
 
-// Inconsistently fails on Android.
-// UNSUPPORTED: android
+// Inconsistently fails on Android and can timeout on darwin platforms.
+// UNSUPPORTED: android, darwin
 
 #include <pthread.h>
 #include <stdlib.h>