--- old/src/cpu/sparc/vm/macroAssembler_sparc.cpp	2013-11-05 11:43:58.607542925 -0800
+++ new/src/cpu/sparc/vm/macroAssembler_sparc.cpp	2013-11-05 11:43:58.367665942 -0800
@@ -3526,8 +3526,11 @@
   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++) {
+  // At this point, (tmp-0) is the last address touched, so don't touch it again.
+  // (It was touched as (tmp-pagesize) but then tmp was post-decremented.)
+  // Skip this address by starting at i=1, and touch a few more pages below.
+  // N.B.  It is important to touch all the down to and including i=StackShadowPages.
+  for (int i = 1; i <= StackShadowPages; i++) {
     set((-i*offset)+STACK_BIAS, Rscratch);
     st(G0, Rtsp, Rscratch);
   }