*** old/src/share/vm/services/mallocTracker.hpp	Mon Feb  9 11:39:11 2015
--- new/src/share/vm/services/mallocTracker.hpp	Mon Feb  9 11:39:11 2015

*** 162,171 ****
--- 162,175 ----
      MallocMemorySnapshot* s = const_cast<MallocMemorySnapshot*>(this);
      return s->by_type(mtThreadStack)->malloc_count();
    }
  
    void copy_to(MallocMemorySnapshot* s) {
+     // Need to make sure that mtChunks don't get deallocated while the
+     // copy is going on, because their size is adjusted using this
+     // buffer in make_adjustment().
+     ThreadCritical tc;
      s->_tracking_header = _tracking_header;
      for (int index = 0; index < mt_number_of_types; index ++) {
        s->_malloc[index] = _malloc[index];
      }
    }