--- old/src/hotspot/share/classfile/systemDictionary.cpp	2018-08-21 14:24:17.924374113 -0400
+++ new/src/hotspot/share/classfile/systemDictionary.cpp	2018-08-21 14:24:17.470331999 -0400
@@ -1878,7 +1878,7 @@
     // Oops referenced by the protection domain cache table may get unreachable independently
     // of the class loader (eg. cached protection domain oops). So we need to
     // explicitly unlink them here.
-    _pd_cache_table->unlink();
+    _pd_cache_table->trigger_cleanup();
   }
 
   if (do_cleaning) {