--- a/src/hotspot/share/gc/g1/g1Analytics.cpp	Tue Nov 21 09:44:50 2017 +0100
+++ b/src/hotspot/share/gc/g1/g1Analytics.cpp	Tue Nov 21 08:33:54 2017 +0100
@@ -90,7 +90,9 @@
     _non_young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)),
     _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)),
     _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)),
-    _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)) {
+    _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)),
+    _recent_avg_pause_time_ratio(0.0),
+    _last_pause_time_ratio(0.0) {
 
   // Seed sequences with initial values.
   _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime());

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/gtest/gc/g1/test_g1Analytics.cpp	Tue Nov 21 08:33:54 2017 +0100
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/g1/g1Predictions.hpp"
+#include "gc/g1/g1Analytics.hpp"
+#include "unittest.hpp"
+
+TEST_VM(G1Analytics, is_initialized) {
+  G1Predictions p(0.888888); // the actual sigma value doesn't matter
+  G1Analytics a(&p);
+  ASSERT_EQ(a.recent_avg_pause_time_ratio(), 0.0);
+  ASSERT_EQ(a.last_pause_time_ratio(), 0.0);
+}