*** old/src/share/vm/opto/output.cpp	Thu Mar  6 11:59:59 2014
--- new/src/share/vm/opto/output.cpp	Thu Mar  6 11:59:58 2014

*** 169,180 ****
--- 169,185 ----
  
  bool Compile::need_stack_bang(int frame_size_in_bytes) const {
    // Determine if we need to generate a stack overflow check.
    // Do it if the method is not a stub function and
    // has java calls or has frame size > vm_page_size/8.
+   // The debug VM checks that deoptimization doesn't trigger an
+   // unexpected stack overflow (compiled method stack banging should
+   // guarantee it doesn't happen) so we always need the stack bang in
+   // a debug VM.
    return (UseStackBanging && stub_function() == NULL &&
-           (has_java_calls() || frame_size_in_bytes > os::vm_page_size()>>3));
+            NOT_DEBUG(|| true)));
  }
  
  bool Compile::need_register_stack_bang() const {
    // Determine if we need to generate a register stack overflow check.
    // This is only used on architectures which have split register