--- old/src/cpu/x86/vm/interp_masm_x86.cpp	2016-09-06 17:16:29.890007721 -0400
+++ new/src/cpu/x86/vm/interp_masm_x86.cpp	2016-09-06 17:16:28.858942053 -0400
@@ -612,6 +612,7 @@
 void InterpreterMacroAssembler::push_l(Register r) {
   subptr(rsp, 2 * wordSize);
   movq(Address(rsp, 0), r);
+  movptr(Address(rsp, Interpreter::expr_offset_in_bytes(1)), NULL_WORD );
 }
 
 void InterpreterMacroAssembler::pop(TosState state) {