diff -r 32a1f7bf0c21 -r 6e0aac35bfa9 src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp
--- a/src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp	Fri Oct 01 21:48:40 2010 -0700
+++ b/src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp	Fri Oct 01 16:43:05 2010 -0400
@@ -37,11 +37,10 @@
 class DirtyCardQueue: public PtrQueue {
 public:
   DirtyCardQueue(PtrQueueSet* qset_, bool perm = false) :
-    PtrQueue(qset_, perm)
-  {
-    // Dirty card queues are always active.
-    _active = true;
-  }
+    // Dirty card queues are always active, so we create them with their
+    // active field set to true.
+    PtrQueue(qset_, perm, true /* active */) { }
+
   // Apply the closure to all elements, and reset the index to make the
   // buffer empty.  If a closure application returns "false", return
   // "false" immediately, halting the iteration.  If "consume" is true,