--- old/src/share/vm/gc/cms/concurrentMarkSweepGeneration.hpp	2016-09-20 11:59:16.082110760 +0200
+++ new/src/share/vm/gc/cms/concurrentMarkSweepGeneration.hpp	2016-09-20 11:59:15.978110756 +0200
@@ -540,7 +540,7 @@
 
   // Overflow list of grey objects, threaded through mark-word
   // Manipulated with CAS in the parallel/multi-threaded case.
-  oop _overflow_list;
+  oopDesc* volatile _overflow_list;
   // The following array-pair keeps track of mark words
   // displaced for accommodating overflow list above.
   // This code will likely be revisited under RFE#4922830.