GDM failure on logout

Question

When I try to log out or switch user I see only the console and can log in and out to both my users. Nothing crashes.
This didn't help https://wiki.archlinux.org/index.php/GD … _on_logout
What I did from the very beginning:
1. At Arch installation I've created a user hg1 in group hg1
2. Recently assigned hg1 to users and made users the primary group for the user hg1
3. Removed the group named hg1
4. Created a new user using
useradd -m -g users -s /bin/bash agg
and asigned a passwd for it.
5. While reviewing the /etc/group I saw the user hg1 is no longer in the wheel group but I did nothing about that.
6. Tried logging out and switching between users for the very first time on that system.
# cat /etc/group
root:x:0:root
bin:x:1:root,bin,daemon
daemon:x:2:root,bin,daemon
sys:x:3:root,bin
adm:x:4:root,daemon
tty:x:5:
disk:x:6:root
lp:x:7:daemon
mem:x:8:
kmem:x:9:
wheel:x:10:root
ftp:x:11:
mail:x:12:
uucp:x:14:
log:x:19:root
utmp:x:20:
locate:x:21:
rfkill:x:24:
smmsp:x:25:
http:x:33:
games:x:50:
lock:x:54:
uuidd:x:68:
dbus:x:81:
network:x:90:
video:x:91:
audio:x:92:
optical:x:93:
floppy:x:94:
storage:x:95:
scanner:x:96:
input:x:97:
power:x:98:
nobody:x:99:
users:x:100:hg1
systemd-journal:x:190:
systemd-journal-gateway:x:191:
systemd-timesync:x:192:
systemd-network:x:193:
systemd-bus-proxy:x:194:
systemd-resolve:x:195:
systemd-journal-remote:x:999:
systemd-journal-upload:x:998:
avahi:x:84:
polkitd:x:102:
colord:x:124:
rtkit:x:133:
gdm:x:120:
git:x:997:
brlapi:x:996:
proc:x:26:

Answer 1

It seems like a Mutter or GDM bug. After installation and creation of hg1 I've set it to autologin using Gnome GUI. Then:
- I created the user agg
- tested logging out / user switching functionality and saw the bug
- in the Gnome GUI I've disabled the autologin setting
- now logging out and switching works but with Mutter crashing and quickly restarting each time
I'll wait a few weeks, post a bug report and post my findings here.