Hi,

The GDM service doesn't start anymore.  To test, you can use the attached
xorg-repro.tmpl (guix system vm xorg-repro.tml && run the resulting script).
QEMU will start, and it will start booting, but nothing graphical will start.
If you switch to the last virtual terminal, you will see

[date] localhost shepherd[1]: Respawning xorg-server.
[date] localhost shepherd[1]: Service host-name has been started.
[date] localhost shepherd[1]: Service xorg-server has been started.
[date] localhost shepherd[1]: Respawning xorg-server.
[date] localhost shepherd[1]: Service host-name has been started.
[date] localhost shepherd[1]: Service xorg-server has been started.
[date] localhost shepherd[1]: Respawning xorg-server.
[date] localhost shepherd[1]: Service host-name has been started.
[date] localhost shepherd[1]: Service xorg-server has been started.
[date] localhost shepherd[1]: Respawning xorg-server.
[date] localhost shepherd[1]: Service host-name has been started.
[date] localhost shepherd[1]: Service xorg-server has been started.
[date] localhost shepherd[1]: Respawning xorg-server.
[date] localhost shepherd[1]: Service host-name has been started.
[date] localhost shepherd[1]: Service xorg-server has been started.
[date] localhost shepherd[1]: Respawning xorg-server.
[date]
localhost shepherd[1]: Service host-name has been started.
[date] localhost shepherd[1]: Service xorg-server has been started.
[date] localhost shepherd[1]:   (Respawning too fast.)

GDM used to work for me with commit 75a3413b4e5c1f7443eb944a36ff364f4c4085f4,
but was broken with e9b87da1c3000c53cf9dbf5e737aa4d6546bd909.  To be bisected?

Greetings,
Maxime.

(xorg-repro.templ is based on the vm-image.tmpl configuration)