--- old/src/share/vm/gc/g1/sparsePRT.cpp	2016-09-12 15:41:05.534114443 +0200
+++ new/src/share/vm/gc/g1/sparsePRT.cpp	2016-09-12 15:41:05.418114438 +0200
@@ -283,7 +283,7 @@
 
 // ----------------------------------------------------------------------
 
-SparsePRT* SparsePRT::_head_expanded_list = NULL;
+SparsePRT* volatile SparsePRT::_head_expanded_list = NULL;
 
 void SparsePRT::add_to_expanded_list(SparsePRT* sprt) {
   // We could expand multiple times in a pause -- only put on list once.