I've seen this error in journalctl on taskotron-dev:
Mar 28 11:05:07 taskotron-dev01.qa.fedoraproject.org sshd[8869]: pam_systemd(sshd:session): Failed to create session: Maximum number of sessions (8192) reached, refusing further sessions.
After further investigation, I've found out that grokmirror does not terminate ssh sessions at all. See loginctl output: https://paste.fedoraproject.org/paste/vKk9WNvR7Sm6jG~iAPmwQA
Since the fpaste will time out eventually, I attach the loginctl output here.
loginctl
<img alt="loginctl.txt" src="/taskotron/issue/raw/files/fce3d658707e6a911ded90133e7f36de7c296b130eff9fb865ee3a30dc1c76da-loginctl.txt" />
The grokmirror sessions are easily 3 weeks old, and are in closing state. We don't know if this causes some actual problems, users can log in and grokmirror can also pull repos in new tasks. But it doesn't look pretty.
closing
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