--- old/src/share/vm/memory/tenuredGeneration.inline.hpp	2014-12-02 10:21:04.809208134 +0100
+++ new/src/share/vm/memory/tenuredGeneration.inline.hpp	2014-12-02 10:21:04.717208138 +0100
@@ -63,7 +63,7 @@
   if (addr < the_space()->top()) return oop(addr)->size();
   else {
     assert(addr == the_space()->top(), "non-block head arg to block_size");
-    return the_space()->_end - the_space()->top();
+    return the_space()->end() - the_space()->top();
   }
 }