*** old/src/cpu/x86/vm/templateInterpreter_x86_64.cpp	Wed Oct 19 08:37:06 2011
--- new/src/cpu/x86/vm/templateInterpreter_x86_64.cpp	Wed Oct 19 08:37:05 2011

*** 1620,1629 ****
--- 1620,1635 ----
      // interpreter_frame_sender_sp interpreter_frame_sender_sp is
      // the original sp of the caller (the unextended_sp) and
      // sender_sp is fp+16 XXX
      intptr_t* locals = interpreter_frame->sender_sp() + max_locals - 1;
  
+ #ifdef ASSERT
+     if (caller->is_interpreted_frame()) {
+       assert(locals < caller->fp() + frame::interpreter_frame_initial_sp_offset, "bad placement");
+     }
+ #endif
+ 
      interpreter_frame->interpreter_frame_set_locals(locals);
      BasicObjectLock* montop = interpreter_frame->interpreter_frame_monitor_begin();
      BasicObjectLock* monbot = montop - moncount;
      interpreter_frame->interpreter_frame_set_monitor_end(monbot);