diff -r 716c746165b2 -r 32c6cc430526 src/hotspot/share/classfile/systemDictionary.cpp
--- a/src/hotspot/share/classfile/systemDictionary.cpp	Tue Jan 08 17:37:57 2019 -0800
+++ b/src/hotspot/share/classfile/systemDictionary.cpp	Wed Jan 09 22:59:49 2019 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1787,14 +1787,17 @@
   assert(k != NULL, "just checking");
   assert_locked_or_safepoint(Compile_lock);
 
-  // Link into hierachy. Make sure the vtables are initialized before linking into
+  k->set_init_state(InstanceKlass::loaded);
+  // make sure init_state store is already done.
+  // The compiler reads the hierarchy outside of the Compile_lock.
+  // Access ordering is used to add to hierarchy.
+
+  // Link into hierachy.
   k->append_to_sibling_list();                    // add to superklass/sibling list
   k->process_interfaces(THREAD);                  // handle all "implements" declarations
-  k->set_init_state(InstanceKlass::loaded);
+
   // Now flush all code that depended on old class hierarchy.
   // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97)
-  // Also, first reinitialize vtable because it may have gotten out of synch
-  // while the new class wasn't connected to the class hierarchy.
   CodeCache::flush_dependents_on(k);
 }