Comment # 19 on bug 937237 from Dinar Valeev

rescue system have udev rule:
SUBSYSTEM=="tty",
KERNEL=="tty[a-zA-Z]*|hvc*|xvc*|hvsi*|ttysclp*|sclp_line*|3270/tty*",
TAG+="systemd"


systemctl status --all dev-hvc0.device
��� dev-hvc0.device
   Loaded: loaded
   Active: inactive (dead)

Oct 05 15:08:44 Rescue systemd[1]: Job dev-hvc0.device/start timed out.
Oct 05 15:08:44 Rescue systemd[1]: Timed out waiting for device
dev-hvc0.device.
Oct 05 15:08:44 Rescue systemd[1]: Job dev-hvc0.device/start failed with result
'timeout'.