586cd08e1bbf8d6b1a960dc94f46235fde0d68c1
Old gdm and lightdm start the user-session during login before they destroy the greeter-session. Therefore, the user-session will take over the VT from the greeter. We recently prevented this by never allowing multiple sessions on the same VT. Fix this now, by explicitly allowing this if the owning session is a GREETER. Note that gdm no longer behaves like this. Instead, due to wayland, they always use a different VT for each session. All other login-managers are highly encouraged to destroy the greeter-session _before_ starting the user-session. We now work around this, but this will probably not last forever (and will already have nasty side-effects on the greeter-session).
systemd - System and Service Manager
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