"cluster-1-thread-2" - Thread t@66
java.lang.Thread.State: BLOCKED
at com.mongodb.DefaultServer$DefaultServerStateListener.stateChanged(DefaultServer.java:112)

• waiting to lock <772e7c67> (a com.mongodb.DefaultServer$DefaultServerStateListener) owned by "cluster-1-thread-1" t@65
  at com.mongodb.DefaultServer.invalidate(DefaultServer.java:87)
  at com.mongodb.MultiServerCluster.invalidateOldPrimaries(MultiServerCluster.java:215)
  at com.mongodb.MultiServerCluster.handleReplicaSetMemberChanged(MultiServerCluster.java:176)
  at com.mongodb.MultiServerCluster.onChange(MultiServerCluster.java:130)
• locked <ce98b52> (a com.mongodb.MultiServerCluster)
  at com.mongodb.MultiServerCluster.access$100(MultiServerCluster.java:39)
  at com.mongodb.MultiServerCluster$DefaultServerStateListener.stateChanged(MultiServerCluster.java:104)
  at com.mongodb.DefaultServer$DefaultServerStateListener.stateChanged(DefaultServer.java:114)
• locked <38b9bb1d> (a com.mongodb.DefaultServer$DefaultServerStateListener)
  at com.mongodb.ServerStateNotifier.run(ServerStateNotifier.java:106)
• locked <5238b42d> (a com.mongodb.ServerStateNotifier)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
  at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
  at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  at java.lang.Thread.run(Thread.java:662)

Locked ownable synchronizers:

• locked <8bd2087> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)

"cluster-1-thread-1" - Thread t@65
java.lang.Thread.State: BLOCKED
at com.mongodb.MultiServerCluster.onChange(MultiServerCluster.java:114)

• waiting to lock <ce98b52> (a com.mongodb.MultiServerCluster) owned by "cluster-1-thread-2" t@66
  at com.mongodb.MultiServerCluster.access$100(MultiServerCluster.java:39)
  at com.mongodb.MultiServerCluster$DefaultServerStateListener.stateChanged(MultiServerCluster.java:104)
  at com.mongodb.DefaultServer$DefaultServerStateListener.stateChanged(DefaultServer.java:114)
• locked <772e7c67> (a com.mongodb.DefaultServer$DefaultServerStateListener)
  at com.mongodb.ServerStateNotifier.run(ServerStateNotifier.java:106)
• locked <38a2838c> (a com.mongodb.ServerStateNotifier)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
  at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
  at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  at java.lang.Thread.run(Thread.java:662)

Locked ownable synchronizers:

• locked <356a7960> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)