--- old/src/share/vm/services/mallocTracker.hpp	2015-02-09 11:39:11.474842000 -0500
+++ new/src/share/vm/services/mallocTracker.hpp	2015-02-09 11:39:11.062921000 -0500
@@ -164,6 +164,10 @@
   }
 
   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];