--- old/src/share/vm/asm/assembler.cpp	2013-10-31 15:52:27.458808536 -0700
+++ new/src/share/vm/asm/assembler.cpp	2013-10-31 15:52:27.370853644 -0700
@@ -122,7 +122,7 @@
 void AbstractAssembler::generate_stack_overflow_check( int frame_size_in_bytes) {
   if (UseStackBanging) {
     // Each code entry causes one stack bang n pages down the stack where n
-    // is configurable by StackBangPages.  The setting depends on the maximum
+    // is configurable by StackShadowPages.  The setting depends on the maximum
     // depth of VM call stack or native before going back into java code,
     // since only java code can raise a stack overflow exception using the
     // stack banging mechanism.  The VM and native code does not detect stack
--- old/src/cpu/sparc/vm/macroAssembler_sparc.cpp	2013-10-31 15:52:27.458808536 -0700
+++ new/src/cpu/sparc/vm/macroAssembler_sparc.cpp	2013-10-31 15:52:27.370853644 -0700
@@ -3526,8 +3526,10 @@
   delayed()->sub(Rtsp, Roffset, Rtsp);
 
   // 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++) {
     set((-i*offset)+STACK_BIAS, Rscratch);
     st(G0, Rtsp, Rscratch);
   }
--- 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 );