[JIRA] [core] (JENKINS-24155) Jenkins Slaves Go Offline In Large Quantities and Don't Reconnect Until Reboot

Wed, 10 Dec 2014 11:46:39 -0800

Relevant bits from the thread dump.

NioChannelHub (and a few other things not included for compactness) are waiting on Channel@2323a3cd

NioChannelHub keys=4 gen=5352736: Computer.threadPoolForRemoting [#2]
 
"NioChannelHub keys=4 gen=5352736: Computer.threadPoolForRemoting [#2]" Id=144 Group=main BLOCKED on hudson.remoting.Channel@2d23a3cd owned by "Finalizer" Id=3
        at hudson.remoting.Channel.terminate(Channel.java:804)
        -  blocked on hudson.remoting.Channel@2d23a3cd
        at hudson.remoting.Channel$2.terminate(Channel.java:491)
        at hudson.remoting.AbstractByteArrayCommandTransport$1.terminate(AbstractByteArrayCommandTransport.java:72)
        at org.jenkinsci.remoting.nio.NioChannelHub$NioTransport.abort(NioChannelHub.java:211)
        at org.jenkinsci.remoting.nio.NioChannelHub.run(NioChannelHub.java:631)
        at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
 
        Number of locked synchronizers = 1
        - java.util.concurrent.ThreadPoolExecutor$Worker@1b9eef5


this is held by the Finalizer that is waiting on FifoBuffer@782372ec





Finalizer
 
"Finalizer" Id=3 Group=system WAITING on org.jenkinsci.remoting.nio.FifoBuffer@782372ec
        at java.lang.Object.wait(Native Method)
        -  waiting on org.jenkinsci.remoting.nio.FifoBuffer@782372ec
        at java.lang.Object.wait(Object.java:503)
        at org.jenkinsci.remoting.nio.FifoBuffer.write(FifoBuffer.java:336)
        at org.jenkinsci.remoting.nio.FifoBuffer.write(FifoBuffer.java:324)
        at org.jenkinsci.remoting.nio.NioChannelHub$NioTransport.writeBlock(NioChannelHub.java:222)
        at hudson.remoting.AbstractByteArrayCommandTransport.write(AbstractByteArrayCommandTransport.java:83)
        at hudson.remoting.Channel.send(Channel.java:553)
        -  locked hudson.remoting.Channel@2d23a3cd
        at hudson.remoting.RemoteInvocationHandler.finalize(RemoteInvocationHandler.java:240)
        at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
        at java.lang.ref.Finalizer.runFinalizer(Unknown Source)
        at java.lang.ref.Finalizer.access$100(Unknown Source)
        at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)





It looks like the Finalizer is trying to write to a channel to cleanup an object with remote state and has effectively locked things up because nothing can come along and force the FifoBuffer write to terminate.
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