diff -r 7939b3c4e408 -r c25572739e7c src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp
--- a/src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp	Wed Aug 08 10:21:23 2018 +0800
+++ b/src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp	Wed Aug 08 15:31:06 2018 +0200
@@ -489,7 +489,7 @@
 }
 
 G1GCParPhaseTimesTracker::G1GCParPhaseTimesTracker(G1GCPhaseTimes* phase_times, G1GCPhaseTimes::GCParPhases phase, uint worker_id) :
-    _phase_times(phase_times), _phase(phase), _worker_id(worker_id) {
+  _start_time(), _phase(phase), _phase_times(phase_times), _worker_id(worker_id) {
   if (_phase_times != NULL) {
     _start_time = Ticks::now();
   }