--- old/src/hotspot/share/runtime/frame.cpp	2018-04-20 00:47:15.000000000 +0100
+++ new/src/hotspot/share/runtime/frame.cpp	2018-04-20 00:47:15.000000000 +0100
@@ -953,6 +953,7 @@
   } else {
     OopMapCache::compute_one_oop_map(m, bci, &mask);
   }
+  // mask.print();
   mask.iterate_oop(&blk);
 }