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From "Roberto Deandrea (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SSHD-911) Deadlock in Apache SshClient used for local port forwarding
Date Fri, 19 Apr 2019 07:27:00 GMT

    [ https://issues.apache.org/jira/browse/SSHD-911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16821745#comment-16821745
] 

Roberto Deandrea commented on SSHD-911:
---------------------------------------

Hi,

More info for troubleshooting...

The problem happens when the SSH client is disconnecting from the SSH server and a quite large
number of client data connections (i.e 20/30 connections) are flowing to target servers...

Description of the DEADLOCK attached to this issue:

 

Thread #1328 name: sshd-SshClient[6fd5a3a4]-nio2-thread-8

org.apache.sshd.client.channel.ClientChannelPendingMessagesQueue.clearPendingQueue(ClientChannelPendingMessagesQueue.java:247)
WAITLOCK pendingQueue

......................

--- org.apache.sshd.common.session.helpers.AbstractSession.doWritePacket(AbstractSession.java:766) LOCKED 
encodeLock

......................

 

Thread #1320 name: sshd-SshClient[6fd5a3a4]-nio2-thread-1
org.apache.sshd.common.session.helpers.AbstractSession.doWritePacket(AbstractSession.java:759)
WAITLOCK encodeLock

............................................

org.apache.sshd.client.channel.ClientChannelPendingMessagesQueue.handleIncomingMessage(ClientChannelPendingMessagesQueue.java:152) LOCKED

 pendingQueue

 

Let me know if you need further info.

 

Kind regards

Roberto Deandrea

 

 

> Deadlock in Apache SshClient used for local port forwarding
> -----------------------------------------------------------
>
>                 Key: SSHD-911
>                 URL: https://issues.apache.org/jira/browse/SSHD-911
>             Project: MINA SSHD
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Roberto Deandrea
>            Assignee: Goldstein Lyor
>            Priority: Major
>         Attachments: spxp.usrdump.20382184@AIX72.DMZ.20190417205240026.log
>
>
> Hi Lyor,
> We have an Apache SSHD 2.2.0 client and server SSH pair used for local port forwarding
of different protocols.
> In our lab environment we found that sometimes when the SSH client for any reason is
disconnecting from the SSH server, a DEADLOCK happens on the sshClient regarding the threads
in the thread pool.
> We are using builtin nio2 implementation for our SshClient.
> The deadlock is regarding the ClientChannelPendingMessagesQueue class added to fix routing
problems for local port forwarding in the past.
> Attached you can find the thread dump taken after the deadlock happend.
>  
> Can you please troubleshoot this problem ?
> [^spxp.usrdump.20382184@AIX72.DMZ.20190417205240026.log]



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