[Nix-dev] Delays on ssh connection

[Carles Pagès]

Hi all,

My system (nixos 14.12.231.139ead2) is in a state that, when
connecting through ssh there is a delay of ~30s. It happened to me a
while ago and was 'solved' with a reboot.

Looking at the logs, I see:
feb 10 09:33:03 pica sshd[9346]: pam_unix(sshd:session): session
opened for user xxx by (uid=0)
feb 10 09:33:03 pica systemd-logind[1748]: New session 66 of user xxx.
feb 10 09:33:28 pica sshd[9346]: pam_systemd(sshd:session): Failed to
create session: Connection timed out

Also, the log is full of:
feb 10 09:33:04 pica systemd[1]: Looping too fast. Throttling
execution a little.

Seems like there is something wrong with systemd. Trying to look for
an explanation, I've found people commenting on similar issues that
were triggered by systemd crashes, but not exactly what I see.

Going back in the log, the 'throttling' starts to appear after this:
feb 09 02:15:01 pica
/nix/store/8xg2yyyj651nik95lqmwza4xn0h7d7na-cron-4.1/bin/cron[24928]:
(root) CMD (/nix/store/8iq0r1d7na-cron-4.1/bin/cron[24928]: (root) CMD
(/nix/store/8iq0r1l97dzcsvkv33zg465gxlsx56dl-systemd-217/bin/systemctl
start ul97dzcsvkv33zg465gxlsx56dl-systemd-217/bin/systemctl start
update-locatedb.service)

Though there's previous executions of that cron task that didn't
trigger the issue.

Any clues on what might be wrong and/or how to solve this?