Issue 234: SshException: Received SSH_MSG_CHANNEL_DATA on unknown channel 0
Status:  AwaitingInformation
Owner: ----
Cc:
Reported by code-rev...@gtempaccount.com, Sep 24, 2009
Reported by Shawn Pearce <sop@google.com> on Thu Jun 25 08:00:46 PDT 2009
Source: JIRA GERRIT-235
Affected Version: 2.0.15

I suspect this exception sometimes occurs when a client disconnects abruptly.

2009-06-25 07:52:24,409::WARN : org.apache.sshd.server.session.ServerSession
- Exception caught
org.apache.sshd.common.SshException: Received SSH_MSG_CHANNEL_DATA on unknown
channel 0
	at org.apache.sshd.common.session.AbstractSession.getChannel
(AbstractSession.java:958)
	at org.apache.sshd.common.session.AbstractSession.channelData
(AbstractSession.java:862)
	at org.apache.sshd.server.session.ServerSession.handleMessage
(ServerSession.java:196)
	at org.apache.sshd.common.session.AbstractSession.decode(AbstractSession.java:
490)
	at org.apache.sshd.common.session.AbstractSession.messageReceived
(AbstractSession.java:214)
	at org.apache.sshd.common.AbstractSessionIoHandler.messageReceived
(AbstractSessionIoHandler.java:58)
	at org.apache.mina.core.filterchain.DefaultIoFilterChain
$TailFilter.messageReceived(DefaultIoFilterChain.java:721)
	at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived
(DefaultIoFilterChain.java:433)
	at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200
(DefaultIoFilterChain.java:47)
	at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl
$1.messageReceived(DefaultIoFilterChain.java:801)
	at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived
(IoFilterAdapter.java:119)
	at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived
(DefaultIoFilterChain.java:433)
	at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived
(DefaultIoFilterChain.java:425)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor.read
(AbstractPollingIoProcessor.java:603)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor.process
(AbstractPollingIoProcessor.java:563)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor.process
(AbstractPollingIoProcessor.java:552)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400
(AbstractPollingIoProcessor.java:56)
	at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run
(AbstractPollingIoProcessor.java:891)
	at org.apache.mina.util.NamePreservingRunnable.run
(NamePreservingRunnable.java:64)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask
(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:
907)
	at java.lang.Thread.run(Thread.java:619)
Sep 24, 2009
#1 sop+code@google.com
(No comment was entered for this change.)
Owner: ---
Nov 17, 2009
#2 sop+code@google.com
Hasn't shown up in a while, nor have I been able to cause it on any sort of recent 
MINA SSHD build.
Status: CannotReproduce
May 25, 2012
Project Member #3 de...@spotify.com
Martin says this is due to SSH ControlMaster being set to auto/on, we see this problem regularly and I have asked users to disable controlmaster for the gitserver.
Status: AwaitingInformation
Cc: mf...@codeaurora.org