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From "Roberto Deandrea (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SSHD-911) Deadlock in Apache SshClient used for local port forwarding
Date Thu, 18 Apr 2019 10:10:00 GMT
Roberto Deandrea created SSHD-911:

             Summary: 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
         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

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 ?


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