[JIRA] [core] (JENKINS-23471) Channel reader thread consumes all CPUs

Tue, 17 Jun 2014 09:50:36 -0700

Issue Type: Bug Bug
Assignee: Unassigned
Components: core
Created: 17/Jun/14 4:49 PM
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)
Project: Jenkins
Priority: Major Major
Reporter: Kohsuke Kawaguchi
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