diff -r 74533f63b116 -r d2a62e0f25eb src/share/vm/utilities/workgroup.hpp
--- a/src/share/vm/utilities/workgroup.hpp	Wed Jun 27 15:23:36 2012 +0200
+++ b/src/share/vm/utilities/workgroup.hpp	Thu Jun 28 17:03:16 2012 -0400
@@ -123,7 +123,7 @@
 // Class AbstractWorkGang:
 // An abstract class representing a gang of workers.
 // You subclass this to supply an implementation of run_task().
-class AbstractWorkGang: public CHeapObj {
+class AbstractWorkGang: public CHeapObj<mtInternal> {
   // Here's the public interface to this class.
 public:
   // Constructor and destructor.
@@ -402,7 +402,7 @@
 // subtasks will be identified by integer indices, usually elements of an
 // enumeration type.
 
-class SubTasksDone : public CHeapObj {
+class SubTasksDone: public CHeapObj<mtInternal> {
   uint* _tasks;
   uint _n_tasks;
   // _n_threads is used to determine when a sub task is done.