--- a/src/hotspot/share/runtime/os.cpp	Thu Nov 15 14:01:10 2018 -0800
+++ b/src/hotspot/share/runtime/os.cpp	Thu Nov 15 17:55:41 2018 -0500
@@ -85,6 +85,8 @@
 
 static size_t cur_malloc_words = 0;  // current size for MallocMaxTestWords
 
+DEBUG_ONLY(bool os::_mutex_init_done = false;)
+
 void os_init_globals() {
   // Called from init_globals().
   // See Threads::create_vm() in thread.cpp, and init.cpp.