GDM no longer starts.

I just installed arch from scratch on my laptop, installing gnome and gdm. After installing gnome-extras, GDM crashed hard. After rebooting, gdm no longer works. I tried stating gdm manually as root and here's the output:
<5>Child process -415 was already dead.
<5>Child process 411 was already dead.
<5>Unable to kill session worker process
<5>Child process 411 was already dead.
<5>Unable to kill session worker process
<5>Child process -423 was already dead.
<5>Child process 420 was already dead.
<5>Unable to kill session worker process
<5>Child process 420 was already dead.
<5>Unable to kill session worker process
<5>Child process -431 was already dead.
<5>Child process 428 was already dead.
<5>Unable to kill session worker process
<5>Child process 428 was already dead.
<5>Unable to kill session worker process
<5>Child process -439 was already dead.
... repeated a couple thousand times ...
<5>Unable to kill session worker process
<5>Child process 4413 was already dead.
<5>Unable to kill session worker process
<5>Child process -4424 was already dead.
<5>Child process -4424 was already dead.
<5>Child process -4432 was already dead.
<5>Child process -4432 was already dead.
<5>Child process -4440 was already dead.
<5>Child process -4440 was already dead.
<5>Could not start command '/usr/lib/gdm/gdm-session-worker': Too many open files
<3>GLib: g_child_watch_add_full: assertion 'pid > 0' failed
<5>Child process -4448 was already dead.
<5>Child process 4445 was already dead.
<5>Unable to kill session worker process
<5>Child process 4445 was already dead.
<5>Unable to kill session worker process
<5>Tried to look up non-existent conversation gdm-launch-environment
<3>GLib: g_hash_table_find: assertion 'version == hash_table->version' failed
<5>(gdm-display.c:1141):gdm_display_dispose: runtime check failed: (self->priv->status != GDM_DISPLAY_PREPARED)
I'm using gnome on wayland right now, but without GDM, for some reason things just don't work right in gnome (menus appear in strange places, etc).

Please provide your journalctl log and graphic driver versions

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