--- old/src/share/vm/gc/cms/parNewGeneration.cpp	2016-09-20 14:25:18.370499538 +0200
+++ new/src/share/vm/gc/cms/parNewGeneration.cpp	2016-09-20 14:25:18.262499533 +0200
@@ -1286,7 +1286,7 @@
       listhead->forward_to(from_space_obj);
       from_space_obj = listhead;
     }
-    oop observed_overflow_list = _overflow_list;
+    oop observed_overflow_list = oop(_overflow_list);
     oop cur_overflow_list;
     do {
       cur_overflow_list = observed_overflow_list;
@@ -1386,7 +1386,7 @@
     // It's possible that the list is still in the empty(busy) state
     // we left it in a short while ago; in that case we may be
     // able to place back the suffix.
-    oop observed_overflow_list = _overflow_list;
+    oop observed_overflow_list = oop(_overflow_list);
     oop cur_overflow_list = observed_overflow_list;
     bool attached = false;
     while (observed_overflow_list == BUSY || observed_overflow_list == NULL) {
@@ -1405,7 +1405,7 @@
         last = last->list_ptr_from_klass();
       }
       // Atomically prepend suffix to current overflow list
-      observed_overflow_list = _overflow_list;
+      observed_overflow_list = oop(_overflow_list);
       do {
         cur_overflow_list = observed_overflow_list;
         if (cur_overflow_list != BUSY) {