--- old/src/hotspot/share/oops/oop.cpp	2018-04-20 00:47:05.000000000 +0100
+++ new/src/hotspot/share/oops/oop.cpp	2018-04-20 00:47:05.000000000 +0100
@@ -41,6 +41,10 @@
 void oopDesc::print_on(outputStream* st) const {
   if (this == NULL) {
     st->print_cr("NULL");
+  } else if (*((juint*)this) == badHeapWordVal) {
+    st->print("BAD WORD");
+  } else if (*((juint*)this) == badMetaWordVal) {
+    st->print("BAD META WORD");
   } else {
     klass()->oop_print_on(oop(this), st);
   }