diff -r 4ed308e0e89b -r 5b4242996d8c src/hotspot/share/oops/instanceKlass.cpp
--- a/src/hotspot/share/oops/instanceKlass.cpp	Tue Nov 20 09:35:15 2018 +0100
+++ b/src/hotspot/share/oops/instanceKlass.cpp	Tue Nov 20 10:08:18 2018 +0100
@@ -1282,7 +1282,6 @@
     JavaThread *jt = (JavaThread *)THREAD;
     {
       // Atomic creation of array_klasses
-      MutexLocker mc(Compile_lock, THREAD);   // for vtables
       MutexLocker ma(MultiArray_lock, THREAD);
 
       // Check if update has already taken place