diff -r a7c0f60a1294 -r 294e48b4f704 hotspot/src/share/vm/runtime/mutexLocker.cpp
--- a/hotspot/src/share/vm/runtime/mutexLocker.cpp	Mon Sep 28 15:05:02 2015 +0200
+++ b/hotspot/src/share/vm/runtime/mutexLocker.cpp	Tue Sep 29 11:02:08 2015 +0200
@@ -156,7 +156,7 @@
   // see if invoker of VM operation owns it
   VM_Operation* op = VMThread::vm_operation();
   if (op != NULL && op->calling_thread() == lock->owner()) return;
-  fatal(err_msg("must own lock %s", lock->name()));
+  fatal("must own lock %s", lock->name());
 }
 
 // a stronger assertion than the above
@@ -164,7 +164,7 @@
   if (IgnoreLockingAssertions) return;
   assert(lock != NULL, "Need non-NULL lock");
   if (lock->owned_by_self()) return;
-  fatal(err_msg("must own lock %s", lock->name()));
+  fatal("must own lock %s", lock->name());
 }
 #endif