Hello World,

Our setup:
* Jenkins 2.32.2 on Debian Linux
  libvirt Plugin for Jenkins
* 8 VMs on the same server, running Windows 7, building our software
  KVM/QEMU VMs, using libvirt
* 4 Ubuntu machines containing 2 VMs each (=8) running Windows 10, testing our software
  KVM/QEMU VMs, using libvirt

We've experienced more and more connection problems lately, all having the same exception:


FATAL: Befehlsausführung fehlgeschlagen
java.io.IOException: Backing channel 'JNLP4-connect connection from build-vm1/192.168.168.160:1033' is disconnected. at hudson.remoting.RemoteInvocationHandler.channelOrFail(RemoteInvocationHandler.java:191) at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:256)
        at com.sun.proxy.$Proxy60.isAlive(Unknown Source)
        at hudson.Launcher$RemoteLauncher$ProcImpl.isAlive(Launcher.java:1043)
        at hudson.Launcher$RemoteLauncher$ProcImpl.join(Launcher.java:1035)
        at hudson.tasks.CommandInterpreter.join(CommandInterpreter.java:154)
        at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:108)
        at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:65)
        at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)
        at hudson.model.Build$BuildExecution.build(Build.java:205)
        at hudson.model.Build$BuildExecution.doRun(Build.java:162)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)
        at hudson.model.Run.execute(Run.java:1728)
        at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
        at hudson.model.ResourceController.execute(ResourceController.java:98)
        at hudson.model.Executor.run(Executor.java:404)
Caused by: java.nio.channels.ClosedChannelException
at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.onReadClosed(ChannelApplicationLayer.java:208) at org.jenkinsci.remoting.protocol.ApplicationLayer.onRecvClosed(ApplicationLayer.java:222) at org.jenkinsci.remoting.protocol.ProtocolStack$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:311)
        at hudson.remoting.Channel.close(Channel.java:1287)
        at hudson.slaves.ChannelPinger$1.onDead(ChannelPinger.java:115)
        at hudson.remoting.PingThread.ping(PingThread.java:130)
        at hudson.remoting.PingThread.run(PingThread.java:86)


These appear randomly on all nodes; we've found no pattern and no way to reproduce them. There are also no more information in the logs.

Has anyone seen the same problems? Any hints what I should check?

TIA and best regards
        Andreas
--
Andreas Tscharner                             <[email protected]>
----------------------------------------------------------------------
"Intruder on level one. All Aliens please proceed to level one."
                                      -- Call in "Alien: Resurrection"

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