--- old/src/hotspot/share/gc/g1/g1ConcurrentMarkThread.cpp	2020-07-23 16:59:06.826687323 +0200
+++ new/src/hotspot/share/gc/g1/g1ConcurrentMarkThread.cpp	2020-07-23 16:59:06.706685493 +0200
@@ -268,7 +268,8 @@
     // called System.gc() with +ExplicitGCInvokesConcurrent).
     {
       SuspendibleThreadSetJoiner sts_join;
-      g1h->increment_old_marking_cycles_completed(true /* concurrent */);
+      g1h->increment_old_marking_cycles_completed(true /* concurrent */,
+                                                  !_cm->has_aborted() /* liveness_completed */);
 
       _cm->concurrent_cycle_end();
       ConcurrentGCBreakpoints::notify_active_to_idle();