| I would almost say this issue is a duplicate of JENKINS-53297 however that issue seems to be specific to k8s version 1.11 and we're using 1.10 (in Google. But after updating the plugin to `1.12.6` we are now getting an excessive amounts (at least half the pods created) of
NoClassDefFoundError: hudson/util/ProcessTree$Linux$LinuxProcess
errors from the jnlp pods. I also don't know if this issue directly contributes to the problem I described in an email thread https://groups.google.com/forum/#!topic/jenkinsci-users/PrASp_sfH8Q Here's an example log from the jnlp pod:
Sep 19, 2018 2:19:24 PM org.jenkinsci.remoting.util.AnonymousClassWarnings warn
WARNING: Attempt to (de-)serialize anonymous class org.jenkinsci.plugins.durabletask.FileMonitoringTask$FileMonitoringController$1; see: https://jenkins.io/redirect/serialization-of-anonymous-classes/
Sep 19, 2018 2:19:27 PM org.csanchez.jenkins.plugins.kubernetes.KubernetesSlave$SlaveDisconnector call
INFO: Disabled slave engine reconnects.
Sep 19, 2018 2:19:27 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Terminated
Sep 19, 2018 2:19:27 PM hudson.util.ProcessTree get
WARNING: Error while determining if vetoers exist
hudson.remoting.RemotingSystemException: hudson.remoting.ChannelClosedException: Channel "hudson.remoting.Channel@294efba:JNLP4-connect connection to jenkins-agent/172.21.241.19:50000": channel is already closed
at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:299)
at com.sun.proxy.$Proxy5.fetch3(Unknown Source)
at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:209)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.util.ProcessTree.get(ProcessTree.java:399)
at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1096)
at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1087)
at hudson.remoting.UserRequest.perform(UserRequest.java:212)
at hudson.remoting.UserRequest.perform(UserRequest.java:54)
at hudson.remoting.Request$2.run(Request.java:369)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:93)
at java.lang.Thread.run(Thread.java:748)
Caused by: hudson.remoting.ChannelClosedException: Channel "hudson.remoting.Channel@294efba:JNLP4-connect connection to jenkins-agent/172.21.241.19:50000": channel is already closed
at hudson.remoting.Channel.send(Channel.java:717)
at hudson.remoting.Request.call(Request.java:160)
at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:286)
... 16 more
Caused by: java.nio.channels.ClosedChannelException
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.onReadClosed(ChannelApplicationLayer.java:209)
at org.jenkinsci.remoting.protocol.ApplicationLayer.onRecvClosed(ApplicationLayer.java:222)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:832)
at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:287)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:181)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.switchToNoSecure(SSLEngineFilterLayer.java:283)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processWrite(SSLEngineFilterLayer.java:503)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processQueuedWrites(SSLEngineFilterLayer.java:248)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doSend(SSLEngineFilterLayer.java:200)
at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doCloseSend(SSLEngineFilterLayer.java:213)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.doCloseSend(ProtocolStack.java:800)
at org.jenkinsci.remoting.protocol.ApplicationLayer.doCloseWrite(ApplicationLayer.java:173)
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer$ByteBufferCommandTransport.closeWrite(ChannelApplicationLayer.java:314)
at hudson.remoting.Channel.close(Channel.java:1450)
at hudson.remoting.Channel.close(Channel.java:1403)
at hudson.remoting.Channel$CloseCommand.execute(Channel.java:1270)
at hudson.remoting.Channel$1.handle(Channel.java:565)
at hudson.remoting.AbstractByteBufferCommandTransport.processCommand(AbstractByteBufferCommandTransport.java:203)
at hudson.remoting.AbstractByteBufferCommandTransport.receive(AbstractByteBufferCommandTransport.java:189)
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.onRead(ChannelApplicationLayer.java:187)
at org.jenkinsci.remoting.protocol.ApplicationLayer.onRecv(ApplicationLayer.java:207)
at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecv(ProtocolStack.java:669)
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.BIONetworkLayer.access$2200(BIONetworkLayer.java:48)
at org.jenkinsci.remoting.protocol.impl.BIONetworkLayer$Reader.run(BIONetworkLayer.java:283)
... 4 more
Sep 19, 2018 2:19:27 PM hudson.util.ProcessTree get
WARNING: Failed to load winp. Reverting to the default
java.lang.NoClassDefFoundError: hudson/util/ProcessTree$Linux$LinuxProcess
at hudson.util.ProcessTree.get(ProcessTree.java:418)
at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1096)
at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1087)
at hudson.remoting.UserRequest.perform(UserRequest.java:212)
at hudson.remoting.UserRequest.perform(UserRequest.java:54)
at hudson.remoting.Request$2.run(Request.java:369)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:93)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: hudson.util.ProcessTree$Linux$LinuxProcess
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:171)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 12 more
Sep 19, 2018 2:19:27 PM hudson.remoting.Request$2 run
INFO: Failed to send back a reply to the request hudson.remoting.Request$2@6361b1fd: hudson.remoting.ChannelClosedException: Channel "hudson.remoting.Channel@294efba:JNLP4-connect connection to jenkins-agent/172.21.241.19:50000": channel is already closed
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