I have onedev's git setup to work with SSH. We have an external tool (GoCD) which polls the repository for each project to detect changes and kick off deployments. It is working but i am encountering an issue.

Periodically all git interactions through ssh begin to fail. It is only temporary and seems to resolve itself given enough time.

When we experience these issues we get the following error in the logs.

2024-02-21 08:09:40,244 ERROR [pool-3-thread-2427] io.onedev.server.git.SshCommand Error executing git command
java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.sshd.common.channel.exception.SshChannelClosedException: write(ChannelOutputStream[ChannelSession[id=0, recipient=0]-ServerSessionImpl[git@/172.21.9.81:58368]] SSH_MSG_CHANNEL_DATA) len=35 - channel already closed
	at io.onedev.commons.utils.command.StreamPumper.waitFor(StreamPumper.java:70)
	at io.onedev.commons.utils.command.PumpInputToOutput.waitFor(PumpInputToOutput.java:26)
	at io.onedev.commons.utils.command.Commandline.execute(Commandline.java:419)
	at io.onedev.commons.utils.command.Commandline.execute(Commandline.java:270)
	at io.onedev.server.git.command.UploadPackCommand.run(UploadPackCommand.java:65)
	at io.onedev.server.git.SshCommand$1.run(SshCommand.java:149)
	at io.onedev.server.util.concurrent.DefaultWorkExecutor$1.call(DefaultWorkExecutor.java:199)
	at io.onedev.server.util.concurrent.DefaultWorkExecutor$1.call(DefaultWorkExecutor.java:195)
	at io.onedev.server.security.SecurityUtils$2.call(SecurityUtils.java:407)
	at io.onedev.server.util.concurrent.DefaultWorkExecutor.lambda$call$0(DefaultWorkExecutor.java:70)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at io.onedev.server.security.SecurityUtils.lambda$inheritSubject$1(SecurityUtils.java:375)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.sshd.common.channel.exception.SshChannelClosedException: write(ChannelOutputStream[ChannelSession[id=0, recipient=0]-ServerSessionImpl[git@/172.21.9.81:58368]] SSH_MSG_CHANNEL_DATA) len=35 - channel already closed
	at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
	at io.onedev.commons.utils.command.StreamPumper.waitFor(StreamPumper.java:68)
	... 14 common frames omitted
Caused by: java.lang.RuntimeException: org.apache.sshd.common.channel.exception.SshChannelClosedException: write(ChannelOutputStream[ChannelSession[id=0, recipient=0]-ServerSessionImpl[git@/172.21.9.81:58368]] SSH_MSG_CHANNEL_DATA) len=35 - channel already closed
	at io.onedev.commons.utils.command.StreamPumper$1.run(StreamPumper.java:40)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
	... 5 common frames omitted
Caused by: org.apache.sshd.common.channel.exception.SshChannelClosedException: write(ChannelOutputStream[ChannelSession[id=0, recipient=0]-ServerSessionImpl[git@/172.21.9.81:58368]] SSH_MSG_CHANNEL_DATA) len=35 - channel already closed
	at org.apache.sshd.common.channel.ChannelOutputStream.write(ChannelOutputStream.java:146)
	at io.onedev.server.util.OutputStreamWrapper.write(OutputStreamWrapper.java:26)
	at io.onedev.commons.utils.com
mand.StreamPumper$1.run(StreamPumper.java:35)
	... 6 common frames omitted