[amv2] CODE-BUG NPE in RTP doing Unassign

2018-08-18 16:55:14,908 INFO  [PEWorker-2] procedure2.ProcedureExecutor: Finished pid=2028, state=SUCCESS, hasLock=false; SplitTableRegionProcedure table=IntegrationTestBigLinkedList, parent=c3f199b5af62ae2ff8f8b6426b21d95d, daughterA=31ccbf098ae615ce30f28ec84c956b8f, daughterB=1890b4c96736f223f31efef11c817c90 in 9.0090sec
2018-08-18 16:55:14,908 INFO  [PEWorker-16] procedure.MasterProcedureScheduler: pid=2038, ppid=2030, state=RUNNABLE:MOVE_REGION_UNASSIGN, hasLock=false; MoveRegionProcedure hri=c3f199b5af62ae2ff8f8b6426b21d95d, source=ve0540.halxg.cloudera.com,16020,1534632630737, destination=ve0540.halxg.cloudera.com,16020,1534632630737 checking lock on c3f199b5af62ae2ff8f8b6426b21d95d
2018-08-18 16:55:14,958 INFO  [PEWorker-16] procedure2.ProcedureExecutor: Initialized subprocedures=[{pid=2095, ppid=2038, state=RUNNABLE:REGION_TRANSITION_DISPATCH, hasLock=false; UnassignProcedure table=IntegrationTestBigLinkedList, region=c3f199b5af62ae2ff8f8b6426b21d95d, server=ve0540.halxg.cloudera.com,16020,1534632630737}]
2018-08-18 16:55:15,008 INFO  [PEWorker-3] procedure.MasterProcedureScheduler: pid=2095, ppid=2038, state=RUNNABLE:REGION_TRANSITION_DISPATCH, hasLock=false; UnassignProcedure table=IntegrationTestBigLinkedList, region=c3f199b5af62ae2ff8f8b6426b21d95d, server=ve0540.halxg.cloudera.com,16020,1534632630737 checking lock on c3f199b5af62ae2ff8f8b6426b21d95d
2018-08-18 16:55:15,085 ERROR [PEWorker-3] procedure2.ProcedureExecutor: CODE-BUG: Uncaught runtime exception: pid=2095, ppid=2038, state=RUNNABLE:REGION_TRANSITION_DISPATCH, hasLock=true; UnassignProcedure table=IntegrationTestBigLinkedList, region=c3f199b5af62ae2ff8f8b6426b21d95d, server=ve0540.halxg.cloudera.com,16020,1534632630737
java.lang.NullPointerException
  at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
  at org.apache.hadoop.hbase.master.assignment.RegionStates.getOrCreateServer(RegionStates.java:1097)
  at org.apache.hadoop.hbase.master.assignment.RegionStates.addRegionToServer(RegionStates.java:1125)
  at org.apache.hadoop.hbase.master.assignment.AssignmentManager.markRegionAsClosing(AssignmentManager.java:1477)
  at org.apache.hadoop.hbase.master.assignment.UnassignProcedure.updateTransition(UnassignProcedure.java:204)
  at org.apache.hadoop.hbase.master.assignment.RegionTransitionProcedure.execute(RegionTransitionProcedure.java:345)
  at org.apache.hadoop.hbase.master.assignment.RegionTransitionProcedure.execute(RegionTransitionProcedure.java:97)
  at org.apache.hadoop.hbase.procedure2.Procedure.doExecute(Procedure.java:873)
  at org.apache.hadoop.hbase.procedure2.ProcedureExecutor.execProcedure(ProcedureExecutor.java:1556)
  at org.apache.hadoop.hbase.procedure2.ProcedureExecutor.executeProcedure(ProcedureExecutor.java:1344)
  at org.apache.hadoop.hbase.procedure2.ProcedureExecutor.access$900(ProcedureExecutor.java:76)
  at org.apache.hadoop.hbase.procedure2.ProcedureExecutor$WorkerThread.run(ProcedureExecutor.java:1854)