--- old/src/cpu/x86/vm/macroAssembler_x86.cpp	2013-10-31 15:52:27.458808536 -0700
+++ new/src/cpu/x86/vm/macroAssembler_x86.cpp	2013-10-31 15:52:27.370853644 -0700
@@ -1381,8 +1381,10 @@
   jcc(Assembler::greater, loop);
 
   // Bang down shadow pages too.
-  // The -1 because we already subtracted 1 page.
-  for (int i = 0; i< StackShadowPages-1; i++) {
+  // Skip the first one because that was already touched in the above
+  // loop - the post decrement of temp means it's now a page below the
+  // last touch
+  for (int i = 1; i <= StackShadowPages; i++) {
     // this could be any sized move but this is can be a debugging crumb
     // so the bigger the better.
     movptr(Address(tmp, (-i*os::vm_page_size())), size );