"jmx@10.173.26.72:36000":
  waiting to lock monitor 0x00002ab8ba5e45c8 (object 0x00000005c038d7d0, a java.util.LinkedHashSet),
  which is held by "TaskQueueChecker"
 
"TaskQueueChecker":
  waiting for ownable synchronizer 0x00000005c03db8f8, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
  which is held by "NodeJobServer-0004"
 
"NodeJobServer-0004":
  waiting to lock monitor 0x00002ab8ba5e45c8 (object 0x00000005c038d7d0, a java.util.LinkedHashSet),
  which is held by "TaskQueueChecker"
 
Java stack information for the threads listed above:
===================================================
 
"jmx@10.173.26.72:36000":
  at org.jppf.server.nio.nodeserver.TaskQueueChecker.removeIdleChannel(TaskQueueChecker.java:183)
  - waiting to lock <0x00000005c038d7d0> (a java.util.LinkedHashSet)
  at org.jppf.server.nio.nodeserver.NodeNioServer.updateConnectionStatus(NodeNioServer.java:274)
  at org.jppf.server.nio.nodeserver.NodeNioServer.addConnection(NodeNioServer.java:182)
  at org.jppf.server.nio.nodeserver.NodeNioServer.nodeConnected(NodeNioServer.java:506)
  at org.jppf.server.nio.nodeserver.AbstractNodeContext$2.jmxWrapperConnected(AbstractNodeContext.java:414)
  at org.jppf.management.JMXConnectionWrapper.fireConnected(JMXConnectionWrapper.java:523)
  at org.jppf.management.JMXConnectionWrapper.performConnection(JMXConnectionWrapper.java:227)
  at org.jppf.management.JMXConnectionThread.run(JMXConnectionThread.java:56)
  at java.lang.Thread.run(Thread.java:745)
 
"TaskQueueChecker":
  at sun.misc.Unsafe.park(Native Method)
  - parking to wait for  <0x00000005c03db8f8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
  at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209)
  at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
  at org.jppf.nio.StateTransitionManager.transitionChannel(StateTransitionManager.java:137)
  at org.jppf.nio.StateTransitionManager.transitionChannel(StateTransitionManager.java:123)
  at org.jppf.server.nio.nodeserver.AbstractNodeContext.submit(AbstractNodeContext.java:465)
  at org.jppf.server.nio.nodeserver.TaskQueueChecker.dispatchJobToChannel(TaskQueueChecker.java:321)
  - locked <0x0000000790f63a18> (a org.jppf.nio.SelectionKeyWrapper)
  at org.jppf.server.nio.nodeserver.TaskQueueChecker.dispatch(TaskQueueChecker.java:256)
  - locked <0x0000000790f63a18> (a org.jppf.nio.SelectionKeyWrapper)
  - locked <0x00000005c038d7d0> (a java.util.LinkedHashSet)
  at org.jppf.server.nio.nodeserver.TaskQueueChecker.run(TaskQueueChecker.java:214)
  at java.lang.Thread.run(Thread.java:745)
 
"NodeJobServer-0004":
  at org.jppf.server.nio.nodeserver.TaskQueueChecker.removeIdleChannel(TaskQueueChecker.java:183)
  - waiting to lock <0x00000005c038d7d0> (a java.util.LinkedHashSet)
  at org.jppf.server.nio.nodeserver.NodeNioServer.updateConnectionStatus(NodeNioServer.java:274)
  at org.jppf.server.nio.nodeserver.NodeNioServer.access$000(NodeNioServer.java:48)
  at org.jppf.server.nio.nodeserver.NodeNioServer$1.executionStatusChanged(NodeNioServer.java:109)
  at org.jppf.server.nio.nodeserver.AbstractNodeContext.fireExecutionStatusChanged(AbstractNodeContext.java:500)
  at org.jppf.server.nio.nodeserver.AbstractNodeContext.setState(AbstractNodeContext.java:369)
  at org.jppf.server.nio.nodeserver.AbstractNodeContext.setState(AbstractNodeContext.java:46)
  at org.jppf.nio.StateTransitionManager.transitionChannel(StateTransitionManager.java:152)
  - locked <0x0000000791211b40> (a org.jppf.nio.SelectionKeyWrapper)
  at org.jppf.nio.StateTransitionTask.run(StateTransitionTask.java:79)
  - locked <0x0000000791211b40> (a org.jppf.nio.SelectionKeyWrapper)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  at java.lang.Thread.run(Thread.java:745)