--- old/src/share/vm/runtime/vframe.hpp	2015-10-08 22:16:05.257883899 +0200
+++ new/src/share/vm/runtime/vframe.hpp	2015-10-08 22:16:05.208885070 +0200
@@ -250,6 +250,7 @@
  public:
   // Constructor
   MonitorInfo(oop owner, BasicLock* lock, bool eliminated, bool owner_is_scalar_replaced) {
+    assert(owner == oopDesc::bs()->write_barrier(owner), "expect to-space copy");
     if (!owner_is_scalar_replaced) {
       _owner = owner;
       _owner_klass = NULL;
@@ -265,6 +266,7 @@
   // Accessors
   oop        owner() const {
     assert(!_owner_is_scalar_replaced, "should not be called for scalar replaced object");
+    assert(_owner == oopDesc::bs()->write_barrier(_owner), "expect to-space copy");
     return _owner;
   }
   oop   owner_klass() const {