--- old/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.cpp	2014-08-05 14:39:25.821869816 +0200
+++ new/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.cpp	2014-08-05 14:39:25.608672853 +0200
@@ -288,7 +288,7 @@
           while (p < to) {
             Prefetch::write(p, interval);
             oop m = oop(p);
-            assert(m->is_oop_or_null(), "check for header");
+            assert(m->is_oop_or_null(), err_msg("check for header: " PTR_FORMAT, p2i(m)));
             m->push_contents(pm);
             p += m->size();
           }
@@ -296,7 +296,7 @@
         } else {
           while (p < to) {
             oop m = oop(p);
-            assert(m->is_oop_or_null(), "check for header");
+            assert(m->is_oop_or_null(), err_msg("check for header: " PTR_FORMAT, p2i(m)));
             m->push_contents(pm);
             p += m->size();
           }