--- a/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	Wed Sep 04 09:47:51 2019 +0200
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	Wed Sep 04 09:47:55 2019 +0200
@@ -1567,6 +1567,7 @@
 
   // Initialize the G1EvacuationFailureALot counters and flags.
   NOT_PRODUCT(reset_evacuation_should_fail();)
+  _gc_tracer_stw->initialize();
 
   guarantee(_task_queues != NULL, "task_queues allocation failure.");
 }