Comment # 26 on bug 1098630 from Franck Bui

Looking at the logs, there's an error before the one reported by David:

  ...
  Jun 21 07:31:39 virt kernel: Netfilter messages via NETLINK v0.30.
  Jun 21 07:31:39 virt kernel: ip_set: protocol 6
  Jun 21 07:32:03 virt runuser[2667]: pam_systemd(runuser:session): Failed to
create session: Connection timed out
  ...

Apparently there's something wrong when pam_systemd try to communicate with
logind in order to create the session.

logind seems to be stuck and the D-Bus timeout expired.

I'll see if I can reproduce the issue.