Found one Java-level deadlock:
=============================
"TCP agent connection handler #159021 with /10.116.113.11:54776":
  waiting for ownable synchronizer 0x00000002ce4a6770, (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync),
  which is held by "IOHub#1: Worker[channel:java.nio.channels.SocketChannel[connected local=/10.116.241.122:8181 remote=10.116.113.11/10.116.113.11:54776]] / Computer.threadPoolForRemoting [#12366]"
"IOHub#1: Worker[channel:java.nio.channels.SocketChannel[connected local=/10.116.241.122:8181 remote=10.116.113.11/10.116.113.11:54776]] / Computer.threadPoolForRemoting [#12366]":
  waiting to lock monitor 0x00007f75cc5900f8 (object 0x00000002ce4de778, a org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer),
  which is held by "TCP agent connection handler #159021 with /10.116.113.11:54776"

Java stack information for the threads listed above:
===================================================
"TCP agent connection handler #159021 with /10.116.113.11:54776":
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000002ce4a6770> (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:967)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1283)
	at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:727)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.getNextSend(ProtocolStack.java:857)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.doSend(ProtocolStack.java:686)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processWrite(SSLEngineFilterLayer.java:518)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processQueuedWrites(SSLEngineFilterLayer.java:248)
	- locked <0x00000002ce4a6800> (a java.lang.Object)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doSend(SSLEngineFilterLayer.java:200)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.doSend(ProtocolStack.java:692)
	at org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer.doSend(ConnectionHeadersFilterLayer.java:497)
	- locked <0x00000002ce4de778> (a org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.doSend(ProtocolStack.java:692)
	at org.jenkinsci.remoting.protocol.ApplicationLayer.write(ApplicationLayer.java:157)
	at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.start(ChannelApplicationLayer.java:230)
	at org.jenkinsci.remoting.protocol.ProtocolStack.init(ProtocolStack.java:201)
	at org.jenkinsci.remoting.protocol.ProtocolStack.access$700(ProtocolStack.java:106)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Builder.build(ProtocolStack.java:554)
	at org.jenkinsci.remoting.engine.JnlpProtocol4Handler.handle(JnlpProtocol4Handler.java:153)
	at jenkins.slaves.JnlpSlaveAgentProtocol4.handle(JnlpSlaveAgentProtocol4.java:205)
	at hudson.TcpSlaveAgentListener$ConnectionHandler.run(TcpSlaveAgentListener.java:260)
"IOHub#1: Worker[channel:java.nio.channels.SocketChannel[connected local=/10.116.241.122:8181 remote=10.116.113.11/10.116.113.11:54776]] / Computer.threadPoolForRemoting [#12366]":
	at org.jenkinsci.remoting.protocol.FilterLayer.onRecvRemoved(FilterLayer.java:133)
	- waiting to lock <0x00000002ce4de778> (a org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.getNextRecv(ProtocolStack.java:929)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecv(ProtocolStack.java:663)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processRead(SSLEngineFilterLayer.java:369)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecv(SSLEngineFilterLayer.java:117)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecv(ProtocolStack.java:669)
	at org.jenkinsci.remoting.protocol.NetworkLayer.onRead(NetworkLayer.java:136)
	at org.jenkinsci.remoting.protocol.impl.NIONetworkLayer.ready(NIONetworkLayer.java:160)
	at org.jenkinsci.remoting.protocol.IOHub$OnReady.run(IOHub.java:795)
	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

Found 1 deadlock.