$ guix pull                                          
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
Authenticating channel 'guix', commits 9edb3f6 to 8b2d266 (145 new commits)...
Building from this channel:
  guix      https://git.savannah.gnu.org/git/guix.git   8b2d266
substitute: updating substitutes from 'https://ci.guix.gnu.org'...   0.0%guix substitute: warning: ci.guix.gnu.org: connection failed: No route to host
substitute:                                                                                                                                           
substitute: updating substitutes from 'https://ci.guix.gnu.org'...   0.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'...   0.0%
building /gnu/store/3v0mmwn8rk9c6kw15pqhz1zhn87zhkz4-module-import.drv...
building /gnu/store/vk8zzl9alzi4lq2hqkhv40scl0s89rpc-module-import.drv...
building /gnu/store/0sllnyxrnvjz093gqyb79h63rnx5fzxr-module-import-compiled.drv...
building /gnu/store/g7c0761clfbqab7xh3h1h7b61cqxa80i-module-import-compiled.drv...                                                                    
building /gnu/store/zpgz919g5wqnfclk4ap23qimldaghik4-compute-guix-derivation.drv...
Computing Guix derivation for 'x86_64-linux'... /Backtrace:
          15 (primitive-load "/gnu/store/yd66cyzrr3r31y1vha262ibbgxa8cv0y-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:
  2129:24 10 (run-with-store #<store-connection 256.99 7a0e0b101280> _ #:guile-for-build _ #:system _ #:target _)
   1966:8  9 (_ _)
In ./guix/gexp.scm:
   300:22  8 (_ _)
   1181:2  7 (_ _)
   1047:2  6 (_ _)
    893:4  5 (_ _)
In ./guix/store.scm:
  2014:12  4 (_ #<store-connection 256.99 7a0dfc7de190>)
   1406:5  3 (map/accumulate-builds #<store-connection 256.99 7a0dfc7de190> #<procedure 7a0e0903ab40 at ./guix/stor?> ?)
  1421:15  2 (_ #<store-connection 256.99 7a0dfc7de190> _ _)
   733:11  1 (process-stderr #<store-connection 256.99 7a0dfc7de190> _)
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/yd66cyzrr3r31y1vha262ibbgxa8cv0y-compute-guix-derivation'                                  
failed to compute the derivation for Guix (version: "8b2d26660717a0f352da54acd68e0d61a7c697df"; system: "x86_64-linux";                               
host version: "1.3.0"; pull-version: 1).
Please report the COMPLETE output above by email to <bug-guix@gnu.org>.