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From "Roger Hart (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SSHD-711) Apache hangs sending file
Date Tue, 08 Nov 2016 00:24:58 GMT
Roger Hart created SSHD-711:
-------------------------------

             Summary: Apache hangs sending file
                 Key: SSHD-711
                 URL: https://issues.apache.org/jira/browse/SSHD-711
             Project: MINA SSHD
          Issue Type: Bug
    Affects Versions: 1.1.0
            Reporter: Roger Hart
            Priority: Minor


We're running 1.1.0 but I get the same problem with 1.2.0. When sending a file to a particular
server we have problems on some machines but not others. I've attached a DEBUG log for a "good"
machine and a "bad" machine.  For the "bad" machine, the system hangs midway through sending
the file. Here are the final log entries.

My theory is that "normally" you see a "Writing X bytes" message, followed by a "Finished
writing" message, followed by a "Read Y bytes" message. But on the "bad" machine there seems
to be 2 "Write" messages before the hang. I think this is because there are 2 threads putting
a write request in the write queue and both are written out to the socket. I'm wondering if
this can cause the max packet size specified in the SSH_MSG_CHANNEL_OPEN_CONFIRMATION message
to be exceeded. The "good" machine has fewer threads than the "bad" machine, and we've also
observed that a smaller files is less likely to hit the problem.

Do you think this theory is valid?

Thanks,
Roger


10:29:22.448 7-Nov-16 -0800 | (lient.channel.ChannelSubsystem) handleData(ChannelSubsystem[id=0,
recipient=0]-ClientSessionImpl[USER@/X.X.X.X:22][sftp]) SSH_MSG_CHANNEL_DATA len=19
10:29:22.450 7-Nov-16 -0800 | (che.sshd.common.channel.Window) waitForSpace(ChannelSubsystem[id=0,
recipient=0]-ClientSessionImpl[USER@/X.X.X.X:22][sftp]: client remote window) available: 1073741779
10:29:22.450 7-Nov-16 -0800 | (che.sshd.common.channel.Window) waitAndConsume(ChannelSubsystem[id=0,
recipient=0]-ClientSessionImpl[USER@/X.X.X.X:22][sftp]: client remote window) - requested=32768,
available=1073741779
10:29:22.463 7-Nov-16 -0800 | (shd.common.io.nio2.Nio2Session) Writing 32820 bytes
10:29:22.464 7-Nov-16 -0800 | (che.sshd.common.channel.Window) waitForSpace(ChannelSubsystem[id=0,
recipient=0]-ClientSessionImpl[USER@/X.X.X.X:22][sftp]: client remote window) available: 1073709011
10:29:22.464 7-Nov-16 -0800 | (che.sshd.common.channel.Window) waitAndConsume(ChannelSubsystem[id=0,
recipient=0]-ClientSessionImpl[USER@/X.X.X.X:22][sftp]: client remote window) - requested=31,
available=1073709011
10:29:22.464 7-Nov-16 -0800 | (shd.common.io.nio2.Nio2Session) Writing 84 bytes
10:29:22.534 7-Nov-16 -0800 | (shd.common.io.nio2.Nio2Session) Finished writing
10:29:22.534 7-Nov-16 -0800 | (shd.common.io.nio2.Nio2Session) Finished writing




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