2618345 - Error: RawDataStash.ChunkHarvester stopping because of exception: java.lang.IllegalArgumentException: Comparison method violates its general contract! in Introscope EM logs - Solution Manager

• You notice suddenly all of the data from Introscope EM (Enterprise Manager) has vanished.
• In the Introscope EM logs you see the following error:

^{[ERROR] [Raw Data Stash] [Manager] RawDataStash.ChunkHarvester stopping because of exception: java.lang.IllegalArgumentException: Comparison method violates its general contract!
java.lang.IllegalArgumentException: Comparison method violates its general contract!
at java.util.TimSort.mergeHi(TimSort.java:895)
at java.util.TimSort.mergeAt(TimSort.java:512)
at java.util.TimSort.mergeForceCollapse(TimSort.java:453)
at java.util.TimSort.sort(TimSort.java:250)
at java.util.Arrays.sort(Arrays.java:1438)
at com.wily.introscope.spec.server.TopNFilter.sortMetrics(TopNFilter.java:354)
at com.wily.introscope.spec.server.beans.metricdata.TimeslicedResultSet.toArray(TimeslicedResultSet.java:701)
at com.wily.introscope.console.thornhill.manager.agent.subscription.SubscriptionSetMonitor.fireSubscriptions(SubscriptionSetMonitor.java:1284)
at com.wily.introscope.console.thornhill.manager.agent.subscription.SubscriptionSetMonitor$MetricDataNotification.handleData(SubscriptionSetMonitor.java:1317)
at com.wily.introscope.server.beans.metricdata.AConstructDataManager$AMetricDataQueryConnector.handleData(AConstructDataManager.java:208)
at com.wily.introscope.server.beans.metricdata.live.AsyncQueryTracker.stopHarvest(AsyncQueryTracker.java:360)
at com.wily.introscope.server.beans.metricdata.live.LiveMetricSubscriptionManager.stopHarvest(LiveMetricSubscriptionManager.java:528)
at com.wily.introscope.server.beans.metricdata.live.RawDataStash$ChunkHarvester.run(RawDataStash.java:298)
at java.lang.Thread.run(Thread.java:745)}

• Introscope EM 9.5
• Introscope EM 9.7
• Introscope EM 10.1 
• Solution Manager 7.1
• Solution Manager 7.2

KBA , XX-PART-WILY , Introscope by CA Technologies , Problem