--- old/src/hotspot/share/classfile/classLoaderData.cpp	2018-07-30 11:03:20.000000000 -0500
+++ new/src/hotspot/share/classfile/classLoaderData.cpp	2018-07-30 11:03:20.000000000 -0500
@@ -1408,6 +1408,7 @@
       }
       data = data->next();
     }
+    SymbolTable::do_check_concurrent_work();
     JFR_ONLY(post_class_unload_events();)
   }