guix reconfigure works and doesn't hang if I add (mount? #f) and reboot and 
mount it manually, like:

>                        (file-system
>                         (device "/dev/mapper/dayas-sys")
>                         (mount-point "/x")
>                         (type "btrfs")
>                         (needed-for-boot? #f)
 (mount? #f)
>                         (dependencies (list dayas-sys)))
>                        %base-file-systems))

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