diff -r 81e878c53615 -r 8a5ea0a9ccc4 src/share/vm/gc_implementation/g1/g1OopClosures.inline.hpp
--- a/src/share/vm/gc_implementation/g1/g1OopClosures.inline.hpp	Fri Oct 05 13:37:08 2012 -0700
+++ b/src/share/vm/gc_implementation/g1/g1OopClosures.inline.hpp	Sat Oct 06 01:17:44 2012 -0700
@@ -111,9 +111,9 @@
 
   oop obj = oopDesc::load_decode_heap_oop(p);
   if (_cm->verbose_high()) {
-    gclog_or_tty->print_cr("[%d] we're looking at location "
+    gclog_or_tty->print_cr("[%u] we're looking at location "
                            "*"PTR_FORMAT" = "PTR_FORMAT,
-                           _task->task_id(), p, (void*) obj);
+                           _task->worker_id(), p, (void*) obj);
   }
   _task->deal_with_reference(obj);
 }