diff -r 45071514f87a -r 8237a91c1cca src/hotspot/share/oops/klassVtable.cpp
--- a/src/hotspot/share/oops/klassVtable.cpp	Tue Apr 03 10:27:46 2018 +0200
+++ b/src/hotspot/share/oops/klassVtable.cpp	Tue Apr 03 13:15:27 2018 +0200
@@ -497,7 +497,7 @@
           // to link to the first super, and we get all the others.
           Handle super_loader(THREAD, super_klass->class_loader());
 
-          if (target_loader() != super_loader()) {
+          if (!oopDesc::equals(target_loader(), super_loader())) {
             ResourceMark rm(THREAD);
             Symbol* failed_type_symbol =
               SystemDictionary::check_signature_loaders(signature, target_loader,
@@ -1226,7 +1226,7 @@
       // if checkconstraints requested
       if (checkconstraints) {
         Handle method_holder_loader (THREAD, target->method_holder()->class_loader());
-        if (method_holder_loader() != interface_loader()) {
+        if (!oopDesc::equals(method_holder_loader(), interface_loader())) {
           ResourceMark rm(THREAD);
           Symbol* failed_type_symbol =
             SystemDictionary::check_signature_loaders(m->signature(),