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  1. Jenkins
  2. JENKINS-23471

Channel reader thread consumes all CPUs

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      Description

      On ci.jenkins-ci.org I noticed that there are a lot of channel reader threads claiming to be connected to remote-slave-6.

      ps output indicates that these threads are eating up CPUs, even though the method names suggest they should be blocking.

      "Channel reader thread: remote-slave-6" prio=10 tid=0x0000000004be5800 nid=0x1f59 runnable [0x00007fb6722e1000]
         java.lang.Thread.State: RUNNABLE
              at com.trilead.ssh2.channel.ChannelInputStream.read(ChannelInputStream.java:77)
              at hudson.remoting.FlightRecorderInputStream.read(FlightRecorderInputStream.java:82)
              at hudson.remoting.ChunkedInputStream.readHeader(ChunkedInputStream.java:68)
              at hudson.remoting.ChunkedInputStream.readUntilBreak(ChunkedInputStream.java:93)
              at hudson.remoting.ChunkedCommandTransport.readBlock(ChunkedCommandTransport.java:33)
              at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34)
              at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48)
      
      "Channel reader thread: remote-slave-6" prio=10 tid=0x0000000004be4000 nid=0x71d8 runnable [0x00007fb673ffe000]
         java.lang.Thread.State: RUNNABLE
              at com.trilead.ssh2.channel.ChannelInputStream.read(ChannelInputStream.java:79)
              at hudson.remoting.FlightRecorderInputStream.read(FlightRecorderInputStream.java:82)
              at hudson.remoting.ChunkedInputStream.readHeader(ChunkedInputStream.java:68)
              at hudson.remoting.ChunkedInputStream.readUntilBreak(ChunkedInputStream.java:93)
              at hudson.remoting.ChunkedCommandTransport.readBlock(ChunkedCommandTransport.java:33)
              at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34)
              at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48)
      
      "Channel reader thread: remote-slave-6" prio=10 tid=0x0000000004e48800 nid=0x4edc runnable [0x00007fb6719d8000]
         java.lang.Thread.State: RUNNABLE
              at com.trilead.ssh2.channel.ChannelInputStream.read(ChannelInputStream.java:79)
              at hudson.remoting.FlightRecorderInputStream.read(FlightRecorderInputStream.java:82)
              at hudson.remoting.ChunkedInputStream.readHeader(ChunkedInputStream.java:67)
              at hudson.remoting.ChunkedInputStream.readUntilBreak(ChunkedInputStream.java:93)
              at hudson.remoting.ChunkedCommandTransport.readBlock(ChunkedCommandTransport.java:33)
              at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34)
              at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48)
      
      "Channel reader thread: remote-slave-6" prio=10 tid=0x0000000004df2000 nid=0x406d runnable [0x00007fb67b432000]
         java.lang.Thread.State: RUNNABLE
              at com.trilead.ssh2.channel.ChannelInputStream.read(ChannelInputStream.java:79)
              at hudson.remoting.FlightRecorderInputStream.read(FlightRecorderInputStream.java:82)
              at hudson.remoting.ChunkedInputStream.readHeader(ChunkedInputStream.java:68)
              at hudson.remoting.ChunkedInputStream.readUntilBreak(ChunkedInputStream.java:93)
              at hudson.remoting.ChunkedCommandTransport.readBlock(ChunkedCommandTransport.java:33)
              at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34)
              at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48)
      
      

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            Assignee:
            Unassigned Unassigned
            Reporter:
            kohsuke Kohsuke Kawaguchi
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              Updated:
              Resolved: