--- old/src/hotspot/share/gc/shared/genCollectedHeap.cpp	2018-04-23 16:50:39.566401372 +0200
+++ new/src/hotspot/share/gc/shared/genCollectedHeap.cpp	2018-04-23 16:50:39.280392457 +0200
@@ -515,9 +515,7 @@
     }
     gen->collect(full, clear_soft_refs, size, is_tlab);
     if (!rp->enqueuing_is_done()) {
-      ReferenceProcessorPhaseTimes pt(NULL, rp->num_queues());
-      rp->enqueue_discovered_references(NULL, &pt);
-      pt.print_enqueue_phase();
+      rp->disable_discovery();
     } else {
       rp->set_enqueuing_is_done(false);
     }