Over the last 24 hours, <root@common-lisp…> has received a number of messages from exim complaining about null message ids. This seems to have ended with a message about an exim4 panic.
This seems to be because I put a "TaskMax" limit to exim4 (via /etc/systemd/system/exim4.service.d/cpu.conf and /sys/fs/cgroup/pids/system.slice/exim4.service) - the monitoring server croaked about too many processes active (and exim4 alone had about 200 or so, IIRC)
I guess that wasn't the smoothest way, but we (EH+me) couldn't see another (clean) way.
Furthermore, a few things have CPU quotas now; see /etc/systemd/system/*/cpu.conf for details.
I notice that clam-av seems not to be running as well:
Jun 30 06:33:35 common-lisp amavis[23388]: (23388-13) (!)connect to /var/run/clamav/clamd.ctl failed, attempt #1: Can't connect to a UNIX socket /var/run/clamav/clamd.ctl: No such file or directory
I don’t have time to look into things at the moment, but will have time in about six hours or so.
If anyone has a chance to poke around to figure out what is wrong before then, please report to this thread.
This message was already in the logs two weeks ago, so it's not my fault ;)
It seems that amavis tries to contact a clamd service and, failing that, just starts clamav each time. So "only" some more load, not a mail classification problem, AFAICS.