src/hotspot/share/c1/c1_Runtime1.cpp

@@ -703,10 +703,13 @@
   NOT_PRODUCT(_monitorenter_slowcase_cnt++;)
   if (PrintBiasedLockingStatistics) {
     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
   }
   Handle h_obj(thread, obj);
+  if (!UseFastLocking) {
+    lock->set_obj(obj);
+  }
   assert(obj == lock->obj(), "must match");
   ObjectSynchronizer::enter(h_obj, lock->lock(), THREAD);
 JRT_END