diff -r 6ddec5389232 -r a1423fe86a18 src/share/vm/memory/genMarkSweep.cpp
--- a/src/share/vm/memory/genMarkSweep.cpp	Fri Oct 02 11:26:25 2009 -0700
+++ b/src/share/vm/memory/genMarkSweep.cpp	Fri Oct 09 15:18:52 2009 -0700
@@ -244,9 +244,12 @@
 
   gch->gen_process_strong_roots(level,
                                 false, // Younger gens are not roots.
+                                true,  // activate StrongRootsScope
                                 true,  // Collecting permanent generation.
                                 SharedHeap::SO_SystemClasses,
-                                &follow_root_closure, &follow_root_closure);
+                                &follow_root_closure,
+                                true,   // walk code active on stacks
+                                &follow_root_closure);
 
   // Process reference objects found during marking
   {
@@ -338,14 +341,19 @@
 
   gch->gen_process_strong_roots(level,
                                 false, // Younger gens are not roots.
+                                true,  // activate StrongRootsScope
                                 true,  // Collecting permanent generation.
                                 SharedHeap::SO_AllClasses,
                                 &adjust_root_pointer_closure,
+                                false, // do not walk code
                                 &adjust_root_pointer_closure);
 
   // Now adjust pointers in remaining weak roots.  (All of which should
   // have been cleared if they pointed to non-surviving objects.)
+  CodeBlobToOopClosure adjust_code_pointer_closure(&adjust_pointer_closure,
+                                                   /*do_marking=*/ false);
   gch->gen_process_weak_roots(&adjust_root_pointer_closure,
+                              &adjust_code_pointer_closure,
                               &adjust_pointer_closure);
 
   adjust_marks();