pfd@FoodCons4:~> guix pull
Updating channel 'guix' from Git repository at 
'https://git.savannah.gnu.org/git/guix.git'...
Authenticating channel 'guix', commits 9edb3f6 to 6ea75bb (55 new 
commits)...
Building from this channel:
  guix https://git.savannah.gnu.org/git/guix.git   6ea75bb
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 
100.0%
building 
/gnu/store/8isdkksaf2gf3s6c0i7kjbivdmqchnjy-compute-guix-derivation.drv...
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 
100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 
100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
-substitute: updating substitutes from 
'https://bordeaux.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 
100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 
100.0%
graphviz-minimal-7.0.1-doc  971KiB 
                                                                                                                                                                                                34.7MiB/s 
00:00 ▕██████████████████▏ 100.0%
-guix substitute: warning: while fetching 
https://ci.guix.gnu.org/nar/lzip/mzfkrxd4w8vqrmyrx169wj8wyw7r8i37-bash: 
server is somewhat slow
guix substitute: warning: try `--no-substitutes' if the problem persists
Backtrace:
In ice-9/boot-9.scm:
  1752:10 19 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
          18 (apply-smob/0 #<thunk 7f164e9162e0>)
In ice-9/boot-9.scm:
    724:2 17 (call-with-prompt _ _ #<procedure default-prompt-handle?>)
In ice-9/eval.scm:
    619:8 16 (_ #(#(#<directory (guile-user) 7f164e91bc80>)))
In guix/ui.scm:
   2275:7 15 (run-guix . _)
  2238:10 14 (run-guix-command _ . _)
In ice-9/boot-9.scm:
  1752:10 13 (with-exception-handler _ _ #:unwind? _ # _)
  1752:10 12 (with-exception-handler _ _ #:unwind? _ # _)
In guix/scripts/substitute.scm:
   856:15 11 (_)
    650:2 10 (process-substitution _ _ _ #:cache-urls _ #:acl _ # _ # ?)
In ice-9/boot-9.scm:
  1752:10  9 (with-exception-handler _ _ #:unwind? _ # _)
In guix/scripts/substitute.scm:
    467:7  8 (download-nar #<<narinfo> path: "/gnu/store/mzfkrxd4w8?> ?)
In ice-9/boot-9.scm:
  1747:15  7 (with-exception-handler #<procedure 7f164e9ffa80 at ic?> ?)
  1685:16  6 (raise-exception _ #:continuable? _)
  1683:16  5 (raise-exception _ #:continuable? _)
  1685:16  4 (raise-exception _ #:continuable? _)
  1780:13  3 (_ #<&compound-exception components: (#<&error> #<&irri?>)
  1685:16  2 (raise-exception _ #:continuable? _)
  1683:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
ERROR:
  1. &http-get-error:
      uri: #<<uri> scheme: https userinfo: #f host: "ci.guix.gnu.org" 
port: #f path: "/nar/lzip/mzfkrxd4w8vqrmyrx169wj8wyw7r8i37-bash" query: 
#f fragment: #f>
      code: 504
      reason: "Gateway Time-out"
Backtrace:
          17 (primitive-load 
"/gnu/store/wgjfic7h24szx3dpp42xfsabv7q6fz20-compute-guix-derivation")
In ice-9/eval.scm:
    155:9 16 (_ _)
    159:9 15 (_ #(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#<directory (guile-u?> 
?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?))
In ice-9/boot-9.scm:
    152:2 14 (with-fluid* _ _ _)
    152:2 13 (with-fluid* _ _ _)
In guix/store.scm:
  2210:24 12 (run-with-store #<store-connection 256.99 7f02941940a0> 
#<procedure 7f027c085730 at guix/self.scm:1365?> ?)
   2038:8 11 (_ #<store-connection 256.99 7f02941940a0>)
In guix/gexp.scm:
   300:22 10 (_ #<store-connection 256.99 7f02941940a0>)
   1218:2  9 (_ #<store-connection 256.99 7f02941940a0>)
   1085:2  8 (_ #<store-connection 256.99 7f02941940a0>)
    926:4  7 (_ #<store-connection 256.99 7f02941940a0>)
In guix/store.scm:
  2095:12  6 (_ #<store-connection 256.99 7f02941940a0>)
   1433:5  5 (map/accumulate-builds #<store-connection 256.99 
7f02941940a0> #<procedure 7f0285c82ac0 at guix/store.?> ?)
  1449:15  4 (_ #<store-connection 256.99 7f02941940a0> 
("/gnu/store/a5893a538104sw14mkyhczfvml1vlz7c-guix-daemo?" ?) ?)
  1449:15  3 (loop #f)
   746:11  2 (process-stderr #<store-connection 256.99 7f02941940a0> _)
\In guix/serialization.scm:
   101:11  1 (read-int #<input-output: file 10>)
     79:6  0 (get-bytevector-n* #<input-output: file 10> 8)

guix/serialization.scm:79:6: In procedure get-bytevector-n*:
ERROR:
  1. &nar-error:
      file: #f
      port: #<input-output: file 10>
guix pull: error: You found a bug: the program 
'/gnu/store/wgjfic7h24szx3dpp42xfsabv7q6fz20-compute-guix-derivation'
failed to compute the derivation for Guix (version: 
"6ea75bb9bcc52521f0bb3f121799745fdc17f1c9"; system: "x86_64-linux";
host version: "871a744e976a70480b8f2040400b00e9bd5a7a79"; pull-version: 1).
Please report the COMPLETE output above by email to <bug-guix@gnu.org>.