src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp

@@ -2880,11 +2880,11 @@
     if (addr != NULL) {
       if (start_array != NULL) {
         start_array->allocate_block(addr);
       }
       oop(addr)->update_contents(cm);
-      assert(oop(addr)->is_oop_or_null(), "should be an oop now");
+      assert(oop(addr)->is_oop_or_null(), err_msg("should be an oop now: " PTR_FORMAT, p2i(oop(addr))));
     }
   }
 }
 
 // Skip over count live words starting from beg, and return the address of the

@@ -3364,11 +3364,11 @@
     Copy::aligned_conjoint_words(source(), destination(), words);
   }
 
   oop moved_oop = (oop) destination();
   moved_oop->update_contents(compaction_manager());
-  assert(moved_oop->is_oop_or_null(), "Object should be whole at this point");
+  assert(moved_oop->is_oop_or_null(), err_msg("Object should be whole at this point: " PTR_FORMAT, p2i(moved_oop)));
 
   update_state(words);
   assert(destination() == (HeapWord*)moved_oop + moved_oop->size(), "sanity");
   return is_full() ? ParMarkBitMap::full : ParMarkBitMap::incomplete;
 }