serv process are not killed (SSHd)

[bruestel]

• Gitea version (or commit ref): 1.7.3 built with go1.11.5 : bindata, sqlite, pam
• Git version: 2.21.0
• Operating system: Arch Linux
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist: https://gist.github.com/bruestel/6e94ac1229e7860230fc481f3e8f384c

Description

Our CI server is checking the git repositories every minute. After a couple of minutes (less than an hour) all the memory is used and the CPU load is very high.
It seems to me that with each ssh connection from our CI there is a new process (/usr/bin/gitea serv key-9 --config=/etc/gitea/app.ini) created. The process gets never disposed.

I've cleaned my logs (#4450) but it didn't help. I think it is a different problem.

Thanks for your help.

[lunny]

@bruestel yes, every ssh request will create a new process but it should be ended some seconds after finished it's work. So maybe you can find some logs to track why it did not end.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs during the next 2 weeks. Thank you for your contributions.

[zeripath]

Hmm... I suspect that these are due to deadlocked processes.

I think it's time to review serv.go again to check if there are deadlocks.

[lunny]

gitea serv will invoke git command and blocked util that command returned. If the command is blocked, it will always wait.

[zeripath]

OK, So both serv and hook appear to be only using private urls which is good - but each action it does is within a new session. We may be better to actually just make serv and hook do all of their logic in a private url and then return their results in simplified fashion to serv/hook.

[lunny]

@zeripath I like your idea. But that may not the reason of this issue.

[zeripath]

It depends on the cause I guess, and although moving the logic won't immediately fix what I suspect is the problem - it will help formulate the complete solution. (It should also make both serv and hook faster as they won't need to make multiple internal API requests - and we might be able to drop the gitlogger.)

I suspect that there's deadlock in hook caused by the calls to send the webhooks.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs during the next 2 weeks. Thank you for your contributions.

[stale]

This issue has been automatically closed because of inactivity. You can re-open it if needed.