@verius @archaeme Yeah there isn't much of use in journalctl

Dec 13 07:50:22 wrongthink systemd[1]: mysql.service: Failed to kill control group /lxc/800/s
Dec 13 07:50:22 wrongthink systemd[1]: mysql.service: Failed to kill control group /lxc/800/s
Dec 13 07:50:22 wrongthink systemd[1]: mysql.service: Failed to kill control group /lxc/800/s
Dec 13 07:50:22 wrongthink systemd[1]: mysql.service: Failed to kill control group /lxc/800/s
Dec 13 07:50:22 wrongthink systemd[1]: Failed to start MySQL Community Server.
-- Subject: Unit mysql.service has failed
-- Defined-By: systemd
Dec 13 07:50:22 wrongthink systemd[1]: mysql.service: Unit entered failed state.
Dec 13 07:50:22 wrongthink systemd[1]: mysql.service: Failed with result 'exit-code'.
Dec 13 07:50:22 wrongthink systemd[1]: mysql.service: Service hold-off time over, scheduling
Dec 13 07:50:22 wrongthink systemd[1]: Stopped MySQL Community Server.