Jenkins slave jobs failing on "Unexpected termination of channel"

Question

I am currently seeing a set of errors across my builds.

Is this expected behaviour if you loose Jenkins (say to a box crash, or a kill -9)?

Or is there something worse going on (like a bad network connection)?

The stack and error is:

hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:158)         at $Proxy175.join(Unknown Source)   at hudson.Launcher$RemoteLauncher$ProcImpl.join(Launcher.java:861)     at hudson.Launcher$ProcStarter.join(Launcher.java:345)     at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:82)         at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:58)         at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)         at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:703)         at hudson.model.Build$RunnerImpl.build(Build.java:178)  at hudson.model.Build$RunnerImpl.doRun(Build.java:139)     at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:473)         at hudson.model.Run.run(Run.java:1410)  at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)     at hudson.model.ResourceController.execute(ResourceController.java:88)         at hudson.model.Executor.run(Executor.java:238) Caused by: hudson.remoting.RequestAbortedException: java.io.IOException: Unexpected termination of the channel   at hudson.remoting.Request.abort(Request.java:273)     at hudson.remoting.Channel.terminate(Channel.java:732)     at hudson.remoting.Channel$ReaderThread.run(Channel.java:1157) Caused by: java.io.IOException: Unexpected termination of the channel  at hudson.remoting.Channel$ReaderThread.run(Channel.java:1133) Caused by: java.io.EOFException    at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2554)         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1297)         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)         at hudson.remoting.Channel$ReaderThread.run(Channel.java:1127) 

Answer 1

You'll see that error if the Jenkins master loses connectivity with the slave. It could be due to any of the three issues you listed above:

• Manually killing the slave process

• The slave server becoming unavailable

• A network problem between the master and the slave

Answer 2

I resolved it by a simple restart of the master Jenkins server.