--- old/src/hotspot/share/code/nmethod.cpp	2017-10-13 11:45:00.256313147 -0400
+++ new/src/hotspot/share/code/nmethod.cpp	2017-10-13 11:44:59.704436083 -0400
@@ -1661,8 +1661,7 @@
 // This code must be MP safe, because it is used from parallel GC passes.
 bool nmethod::test_set_oops_do_mark() {
   assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
-  nmethod* observed_mark_link = _oops_do_mark_link;
-  if (observed_mark_link == NULL) {
+  if (_oops_do_mark_link == NULL) {
     // Claim this nmethod for this thread to mark.
     if (Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_link, (nmethod*)NULL) == NULL) {
       // Atomically append this nmethod (now claimed) to the head of the list: