user@host ~$ guix pull
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
Authenticating channel 'guix', commits 9edb3f6 to 050be36 (65 new commits)...
Building from this channel:
  guix      https://git.savannah.gnu.org/git/guix.git	050be36
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
 compute-guix-derivation  1005B     77KiB/s 00:00 [##################] 100.0%
Computing Guix derivation for 'x86_64-linux'... /Backtrace:
          15 (primitive-load "/gnu/store/0s55qkdcgpbirx39g94wlsyfp79nmmvl-compute-guix-derivation")
In ice-9/eval.scm:
    155:9 14 (_ _)
    159:9 13 (_ #(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#<directory (guile-u?> ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?))
In ice-9/boot-9.scm:
    152:2 12 (with-fluid* _ _ _)
    152:2 11 (with-fluid* _ _ _)
In ./guix/store.scm:
  2066:24 10 (run-with-store #<store-connection 256.99 7fa3758b23c0> _ #:guile-for-build _ #:system _ #:target _)
   1900:8  9 (_ _)
In ./guix/gexp.scm:
   256:18  8 (_ _)
   1137:2  7 (_ _)
   1003:2  6 (_ _)
    849:4  5 (_ _)
In ./guix/store.scm:
  1948:12  4 (_ #<store-connection 256.99 7fa3758b23c0>)
   1362:5  3 (map/accumulate-builds #<store-connection 256.99 7fa3758b23c0> _ _)
  1373:15  2 (_ #<store-connection 256.99 7fa3758b23c0> _ _)
   719:11  1 (process-stderr #<store-connection 256.99 7fa3758b23c0> _)
In ./guix/serialization.scm:
     80:6  0 (read-int #<input-output: file 10>)

./guix/serialization.scm:80:6: In procedure read-int:
ERROR:
  1. &nar-error:
      file: #f
      port: #<input-output: file 10>
guix pull: error: You found a bug: the program '/gnu/store/0s55qkdcgpbirx39g94wlsyfp79nmmvl-compute-guix-derivation'
failed to compute the derivation for Guix (version: "050be36cbf3a42199f64f2e44c59f1cb1b3afab5"; system: "x86_64-linux";
host version: "995f685e4de49683399715932792e730f918d2a2"; pull-version: 1).
Please report it by email to <bug-guix@gnu.org>.

user@host ~$