--- a/src/hotspot/share/runtime/biasedLocking.cpp	Tue Apr 03 10:27:46 2018 +0200
+++ b/src/hotspot/share/runtime/biasedLocking.cpp	Tue Apr 03 13:15:27 2018 +0200
@@ -254,7 +254,7 @@
   BasicLock* highest_lock = NULL;
   for (int i = 0; i < cached_monitor_info->length(); i++) {
     MonitorInfo* mon_info = cached_monitor_info->at(i);
-    if (mon_info->owner() == obj) {
+    if (oopDesc::equals(mon_info->owner(), obj)) {
       log_trace(biasedlocking)("   mon_info->owner (" PTR_FORMAT ") == obj (" PTR_FORMAT ")",
                                p2i((void *) mon_info->owner()),
                                p2i((void *) obj));