I opened a ticket upstream. You can find it here:
https://github.com/systemd/systemd/issues/12867
Thank you for your help!
Sorry for the late reply here. Got caught up in other stuff. I did
some digging around. Set the loglevel with systemd-analyze to debug
and also added the debug flag to pam_systemd.so.
What I noticed is that on boot, when 5000+ machines try to
authenticate at once, pam_systemd seems to fall on
Package: systemd
Version: 232-25+deb9u11
Severity: normal
Dear Maintainer,
Systemd does not seem to consistently put sshd processes under the
relevant user's slice. I have a user with 10925 sshd processes related
to its sessions. 7552 of those are put under session scopes in the
user's slice.
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