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)
      
      

          [JENKINS-23471] Channel reader thread consumes all CPUs

          Kohsuke Kawaguchi created issue -
          Kohsuke Kawaguchi made changes -
          Attachment New: threads.txt [ 26106 ]
          Daniel Beck made changes -
          Labels New: remoting
          SCM/JIRA link daemon made changes -
          Resolution New: Fixed [ 1 ]
          Status Original: Open [ 1 ] New: Resolved [ 5 ]
          Daniel Beck made changes -
          Labels Original: remoting New: lts-candidate remoting
          Oliver Gondža made changes -
          Labels Original: lts-candidate remoting New: 1.580.1-fixed remoting
          R. Tyler Croy made changes -
          Workflow Original: JNJira [ 156099 ] New: JNJira + In-Review [ 195346 ]

            Unassigned Unassigned
            kohsuke Kohsuke Kawaguchi
            Votes:
            2 Vote for this issue
            Watchers:
            4 Start watching this issue

              Created:
              Updated:
              Resolved: