src/hotspot/share/runtime/vframe.cpp

@@ -244,17 +244,20 @@
            // an inflated monitor that is first on the monitor list in
            // the first frame can block us on a monitor enter.
            markWord mark = monitor->owner()->mark();
            // The first stage of async deflation does not affect any field
            // used by this comparison so the ObjectMonitor* is usable here.
-           if (mark.has_monitor() &&
-               ( // we have marked ourself as pending on this monitor
-                 mark.monitor() == thread()->current_pending_monitor() ||
+           if (mark.has_monitor()) {
+             ObjectMonitor* mon = ObjectSynchronizer::read_monitor(current, monitor->owner(), mark);
+             if (// if the monitor is null we must be in the process of locking
+                 mon == nullptr ||
+                 // we have marked ourself as pending on this monitor
+                 mon == thread()->current_pending_monitor() ||
                  // we are not the owner of this monitor
-                 !mark.monitor()->is_entered(thread())
-               )) {
-             lock_state = "waiting to lock";
+                 !mon->is_entered(thread())) {
+               lock_state = "waiting to lock";
+             }
            }
          }
          print_locked_object_class_name(st, Handle(current, monitor->owner()), lock_state);
  
          found_first_monitor = true;