--- old/src/hotspot/share/gc/z/zHeap.cpp	2018-10-18 14:45:48.139324791 +0200
+++ new/src/hotspot/share/gc/z/zHeap.cpp	2018-10-18 14:45:47.817310965 +0200
@@ -22,6 +22,7 @@
  */
 
 #include "precompiled.hpp"
+#include "gc/shared/fill.hpp"
 #include "gc/shared/oopStorage.hpp"
 #include "gc/z/zAddress.hpp"
 #include "gc/z/zGlobals.hpp"
@@ -74,6 +75,9 @@
   assert(_heap == NULL, "Already initialized");
   _heap = this;
 
+  // Heap not parsable
+  Fill::set_disabled();
+
   // Update statistics
   ZStatHeap::set_at_initialize(heap_max_size(), heap_max_reserve_size());
 }