* primary network interface is not configured. This caused total network outage as this system is the DHCP server for the network. Root cause = systemd. It messed up the network config.
* Full GUI loads at boot. RPi was set to be headless, but systemd pulled in dependencies requiring all of X11 (probably for the hideously awful systemd-ui app, the most user-unfriendly thing I've used. And I've used Microsoft Windows.)
* systemd-logind is broken by default, there's no login consoles.
* load is constantly over 1.5 because of this:
top - 15:21:53 up 4 days, 2:12, 2 users, load average: 1.58, 1.58, 1.50 Tasks: 127 total, 2 running, 125 sleeping, 0 stopped, 0 zombie %Cpu(s): 10.4 us, 14.2 sy, 0.0 ni, 75.2 id, 0.0 wa, 0.0 hi, 0.3 si, 0.0 st KiB Mem: 949408 total, 711404 used, 238004 free, 88224 buffers KiB Swap: 1918972 total, 0 used, 1918972 free. 247176 cached Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 20 0 6416 4972 2748 R 77.6 0.5 4493:41 systemd
Hovers between 77 and 90% CPU utilisation. There's absolutely NOTHING logged as to why.
* shutdown is broken because systemd refuses to shut the system down until one of its broken components responds - which it doesn't in 7 hours of waiting. Only solution is hard poweroff.
Whoever decided this should be the default init in Debian needs to be taken out to pasture and shot thrice.