--- old/src/cpu/x86/vm/sharedRuntime_x86_64.cpp	2014-03-20 11:28:56.907637111 +0100
+++ new/src/cpu/x86/vm/sharedRuntime_x86_64.cpp	2014-03-20 11:28:56.611761946 +0100
@@ -1998,7 +1998,8 @@
   // Generate stack overflow check
 
   if (UseStackBanging) {
-    __ bang_stack_with_offset(StackShadowPages*os::vm_page_size());
+    // See AbstractAssembler::generate_stack_overflow_check
+    __ bang_stack_with_offset((StackShadowPages+1)*os::vm_page_size());
   } else {
     // need a 5 byte instruction to allow MT safe patching to non-entrant
     __ fat_nop();
@@ -3477,11 +3478,15 @@
   // restore rbp before stack bang because if stack overflow is thrown it needs to be pushed (and preserved)
   __ movptr(rbp, Address(rdi, Deoptimization::UnrollBlock::initial_info_offset_in_bytes()));
 
-  // Stack bang to make sure there's enough room for these interpreter frames.
+#ifdef ASSERT
+  // Compilers generate code that bang the stack by as much as the
+  // interpreter would need. So this stack banging should never
+  // trigger a fault. Verify that it does not on non product builds.
   if (UseStackBanging) {
     __ movl(rbx, Address(rdi, Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes()));
     __ bang_stack_size(rbx, rcx);
   }
+#endif
 
   // Load address of array of frame pcs into rcx
   __ movptr(rcx, Address(rdi, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes()));
@@ -3670,11 +3675,15 @@
   // restore rbp before stack bang because if stack overflow is thrown it needs to be pushed (and preserved)
   __ movptr(rbp, Address(rdi, Deoptimization::UnrollBlock::initial_info_offset_in_bytes()));
 
-  // Stack bang to make sure there's enough room for these interpreter frames.
+#ifdef ASSERT
+  // Compilers generate code that bang the stack by as much as the
+  // interpreter would need. So this stack banging should never
+  // trigger a fault. Verify that it does not on non product builds.
   if (UseStackBanging) {
     __ movl(rbx, Address(rdi ,Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes()));
     __ bang_stack_size(rbx, rcx);
   }
+#endif
 
   // Load address of array of frame pcs into rcx (address*)
   __ movptr(rcx, Address(rdi, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes()));