David Ostrovsky created SSHD-942:
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Summary: SSH session crashes on high latency network
Key: SSHD-942
URL: https://issues.apache.org/jira/browse/SSHD-942
Project: MINA SSHD
Issue Type: Bug
Affects Versions: 1.7.0, 2.0.0, 2.3.0
Reporter: David Ostrovsky
Gerrit users report problem: [1] with {{git clone/fetch/pull}} operations on
high latency network, after upgrading Gerrit to 2.16.x from 2.15.x that
effectively means upgrade of SSHD from 1.6.0 to 1.7.0 and to 2.0.0.
The error on SSHD 2.0.0 (Gerrit 2.16) is:
{noformat}
[2019-09-16 10:27:14,256] [sshd-SshServer[24facb47]-nio2-thread-8] WARN
org.apache.sshd.server.session.ServerSessionImpl :
exceptionCaught(ServerSessionImpl[usexxx@/172.x.x.1:63306])[state=Opened]
SshChannelNotFoundException: Received SSH_MSG_CHANNEL_WINDOW_ADJUST on unknown
channel 0
{noformat}
Note that the attempt to upgrade SSHD in Gerrit to 2.3.0 in this CL: [2],
didn't fix the problem:
{noformat}
[2019-09-17 14:05:27,923] [sshd-SshDaemon[189c6683](port=22)-nio2-thread-4]
WARN org.apache.sshd.server.session.ServerSessionImpl :
exceptionCaught(ServerSessionImpl[<username>@/<ip>:55212])[state=Opened]
SshChannelNotFoundException: Received SSH_MSG_CHANNEL_WINDOW_ADJUST on unknown
channel 3
[2019-09-17 14:05:27,924] [SSH git-upload-pack <repo> (<username>)] ERROR
com.google.gerrit.sshd.BaseCommand : Internal server error (user <username>
account 1000190) during git-upload-pack '<repo path>'
org.apache.sshd.common.channel.WindowClosedException: Already closed:
Window[server/remote](ChannelSession[id=2,
recipient=6]-ServerSessionImpl[<username>@/<ip>:55212])
at org.apache.sshd.common.channel.Window.waitForCondition(Window.java:302)
at org.apache.sshd.common.channel.Window.waitForSpace(Window.java:252)
{noformat}
Also note, that downgrade to 1.7.0: [3] didn't fix the problem either. Only
after downgrade to SSH 1.6.0: [4] the problem disappeared, and only warnings
left in the log:
{noformat}
[2019-09-18 09:24:52,755] [NioProcessor-2] WARN
org.apache.sshd.server.session.ServerConnectionService : Received
SSH_MSG_CHANNEL_CLOSE on unknown channel 12
[2019-09-18 09:24:52,756] [NioProcessor-2] WARN
org.apache.sshd.server.session.ServerConnectionService : Received
SSH_MSG_CHANNEL_CLOSE on unknown channel 13
[2019-09-18 09:25:02,576] [NioProcessor-2] WARN
org.apache.sshd.server.session.ServerConnectionService : Received
SSH_MSG_CHANNEL_CLOSE on unknown channel 15
[2019-09-18 09:25:36,508] [NioProcessor-2] WARN
org.apache.sshd.server.session.ServerConnectionService : Received
SSH_MSG_CHANNEL_CLOSE on unknown channel 18
[2019-09-18 09:25:57,527] [NioProcessor-2] WARN
org.apache.sshd.server.session.ServerConnectionService : Received
SSH_MSG_CHANNEL_CLOSE on unknown channel 19
[2019-09-18 09:30:16,488] [NioProcessor-2] WARN
org.apache.sshd.server.session.ServerConnectionService : Received
SSH_MSG_CHANNEL_CLOSE on unknown channel 21
{noformat}
[1]
[https://bugs.chromium.org/p/gerrit/issues/detail?id=11491|https://bugs.chromium.org/p/gerrit/issues/detail?id=11491&;]
[2] [https://gerrit-review.googlesource.com/c/gerrit/+/207752]
[3] [https://gerrit-review.googlesource.com/c/gerrit/+/237730]
[4] https://gerrit-review.googlesource.com/c/gerrit/+/237731
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