Hello, recently I found that "guix system" makes a "broken" system for
me.  When I boot a freshly created system, I get something like this:

  In procedure <...> at ./gnu/build/file-systems.scm:282:4 (device)
  In procedure fport_seek: Invalid argument

and I'm thrown at the Guile promt.

The same problem (well, I think it's the same) was also reported by
roptat on #guix:

  https://gnunet.org/bot/log/guix/2017-01-28#T1277485

After bisecting the guix git checkout, I found that commit b1a505baf6¹
was the first one where my system starts to fail.  And indeed when I
reverted this commit on the latest master, guix built a working system.
Moreover, the following simple diff (it's a partial revert of that
commit) "fixes" guix for me:

diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index 6e5c6aa..f05e035 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -294,15 +294,11 @@ partition field reader that returned a value."
 
 (define %partition-label-readers
   (list (partition-field-reader read-ext2-superblock
-                                ext2-superblock-volume-name)
-        (partition-field-reader read-btrfs-superblock
-                                btrfs-superblock-volume-name)))
+                                ext2-superblock-volume-name)))
 
 (define %partition-uuid-readers
   (list (partition-field-reader read-ext2-superblock
-                                ext2-superblock-uuid)
-        (partition-field-reader read-btrfs-superblock
-                                btrfs-superblock-uuid)))
+                                ext2-superblock-uuid)))
 
 (define read-partition-label
   (cut read-partition-field <> %partition-label-readers))
I don't have btrfs anywhere (only ext4).  During bisecting experiments I
used the attached system config (but the config shouldn't matter I think
as I tried various variants, and all gave me the same result).

Any idea how to dig further?  Perhaps there is something I can do in the
Guile prompt.

¹ 
http://git.savannah.gnu.org/cgit/guix.git/commit/?id=b1a505baf61cc771197eb44af9173f31d2bace46

(use-modules (gnu))

(operating-system
  (host-name "leviafan")
  (timezone "Europe/Moscow")
  (locale "en_US.utf8")
  (bootloader (grub-configuration (device "/dev/sda")))
  (initrd (lambda (fs . args)
            (apply base-initrd fs
                   #:extra-modules '("sata_nv") ; for my HDD
                   args)))
  (file-systems (cons (file-system
                        (device "guix")
                        (title 'label)
                        (mount-point "/")
                        (type "ext4"))
                      %base-file-systems))
  (users (cons (user-account
                (name "al")
                (group "users")
                (supplementary-groups '("wheel" "audio" "video"))
                (home-directory "/home/al"))
               %base-user-accounts))
  (packages %base-packages)
  (services (cons* (console-keymap-service "dvorak")
                   %base-services)))

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