--- old/src/share/vm/opto/output.cpp	2015-10-14 13:54:25.431618335 +0200
+++ new/src/share/vm/opto/output.cpp	2015-10-14 13:54:25.330620777 +0200
@@ -908,7 +908,7 @@
             method->is_native() ||
             num_mon > 0 ||
             !GenerateSynchronizationCode,
-            "monitors must always exist for synchronized methods");
+            "monitors must always exist for synchronized methods, bci: %d");
 
     // Build the growable array of ScopeValues for exp stack
     GrowableArray<MonitorValue*> *monarray = new GrowableArray<MonitorValue*>(num_mon);