--- old/src/share/vm/gc/g1/dirtyCardQueue.cpp	2016-04-06 17:17:17.290383583 +0200
+++ new/src/share/vm/gc/g1/dirtyCardQueue.cpp	2016-04-06 17:17:17.194383582 +0200
@@ -160,7 +160,7 @@
   size_t limit = DirtyCardQueue::byte_index_to_index(buffer_size());
   size_t i = DirtyCardQueue::byte_index_to_index(node->index());
   for ( ; i < limit; ++i) {
-    jbyte* card_ptr = static_cast<jbyte*>(buf[i]);
+    volatile jbyte* card_ptr = static_cast<volatile jbyte*>(buf[i]);
     assert(card_ptr != NULL, "invariant");
     if (!cl->do_card_ptr(card_ptr, worker_i)) {
       result = false;           // Incomplete processing.