--- old/src/share/vm/gc/g1/g1BlockOffsetTable.cpp	2016-11-15 18:28:25.879483867 -0500
+++ new/src/share/vm/gc/g1/g1BlockOffsetTable.cpp	2016-11-15 18:28:25.783479017 -0500
@@ -227,7 +227,7 @@
     while (n <= next_boundary) {
       q = n;
       oop obj = oop(q);
-      if (obj->klass_or_null() == NULL) return q;
+      if (obj->klass_or_null_acquire() == NULL) return q;
       n += block_size(q);
     }
     assert(q <= next_boundary && n > next_boundary, "Consequence of loop");