--- old/src/share/vm/oops/instanceRefKlass.cpp	2015-10-08 22:15:46.955321022 +0200
+++ new/src/share/vm/oops/instanceRefKlass.cpp	2015-10-08 22:15:46.908322144 +0200
@@ -91,7 +91,7 @@
 
 bool InstanceRefKlass::owns_pending_list_lock(JavaThread* thread) {
   if (java_lang_ref_Reference::pending_list_lock() == NULL) return false;
-  Handle h_lock(thread, java_lang_ref_Reference::pending_list_lock());
+  Handle h_lock(thread, oopDesc::bs()->write_barrier(java_lang_ref_Reference::pending_list_lock()));
   return ObjectSynchronizer::current_thread_holds_lock(thread, h_lock);
 }
 
@@ -104,7 +104,7 @@
   // to hold the pending list lock. We want to free this handle.
   HandleMark hm;
 
-  Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
+  Handle h_lock(THREAD, oopDesc::bs()->write_barrier(java_lang_ref_Reference::pending_list_lock()));
   ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD);
   assert(ObjectSynchronizer::current_thread_holds_lock(
            JavaThread::current(), h_lock),
@@ -122,7 +122,7 @@
   // to hold the pending list lock. We want to free this handle.
   HandleMark hm;
 
-  Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
+  Handle h_lock(THREAD, oopDesc::bs()->write_barrier(java_lang_ref_Reference::pending_list_lock()));
   assert(ObjectSynchronizer::current_thread_holds_lock(
            JavaThread::current(), h_lock),
          "Lock should be held");