--- old/src/hotspot/share/runtime/vframe.cpp	2019-08-13 12:39:55.748324797 +0200
+++ new/src/hotspot/share/runtime/vframe.cpp	2019-08-13 12:39:55.452319664 +0200
@@ -224,7 +224,7 @@
       if (monitor->owner() != NULL) {
         // the monitor is associated with an object, i.e., it is locked
 
-        markWord mark(0);
+        markWord mark(markWord::zero);
         const char *lock_state = "locked"; // assume we have the monitor locked
         if (!found_first_monitor && frame_count == 0) {
           // If this is the first frame and we haven't found an owned
@@ -241,9 +241,12 @@
               )) {
             lock_state = "waiting to lock";
           } else {
+		  	// FIXME: mark is set but not used below.
+			//        Either the comment or the code is broken.
+		  
             // We own the monitor which is not as interesting so
             // disable the extra printing below.
-            mark = markWord(0);
+            mark = markWord(markWord::zero);
           }
         }
         print_locked_object_class_name(st, Handle(THREAD, monitor->owner()), lock_state);