(EE) 0: /nix/store/sgzwfb9k14myjfdxmz7zg6wqhb7mi0d9-xorg-server-21.1.14/bin/X (OsSigHandler+0x33) [0x5c2c33]
(EE) unw_get_proc_name failed: no unwind info found [-10]
What is your services.xserver.videoDrivers ? This looks like issue #342763.
EDIT: I missed you had alrady posted it. Yes, you’re using the intel driver which is currently broken.