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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).
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Please provide your journalctl log and graphic driver versions
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