This error, Cannot contact <slave name>: java.lang.InterruptedException,

• no other messages, just one line.
• happen most often during network I/O intense process like downloading.. also seen during shell script running, building software and tarring files, git merge... while other metrics like cpu usage, memory usage and disk usage are pretty normal/stable, not high load.
• This error will/will not lead the job to fail. 

• This message will show in build logs and it happens on many slaves, some of the slaves are VMs on server, some of them are physical server.
• many affected jobs have parallel branches.
• network seems working well.
• also it might be correlated to, (shown in slave's log on master machine, this one does not happen often, but at least one time it synced with the error in question): 

• • INFO: Failed to synchronize IO streams on the channel hudson.remoting.Channel@762efe5d:channel java.lang.InterruptedException     at java.lang.Object.wait(Native Method) at hudson.remoting.Request.call(Request.java:172) at hudson.remoting.Channel.call(Channel.java:951) at hudson.remoting.Channel.syncIO(Channel.java:1679) at hudson.Launcher$RemoteLaunchCallable$1.join(Launcher.java:1315) at sun.reflect.GeneratedMethodAccessor164.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:927) at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:901) at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:850) at hudson.remoting.UserRequest.perform(UserRequest.java:210) at hudson.remoting.UserRequest.perform(UserRequest.java:53) at hudson.remoting.Request$2.run(Request.java:364) 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 java.lang.Thread.run(Thread.java:748)

     

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