$ guix pull 
Updating channel 'nonguix' from Git repository at 'https://gitlab.com/nonguix/nonguix'...
Authenticating channel 'nonguix', commits 897c1a4 to 026b5b5 (172 new commits)...
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
Authenticating channel 'guix', commits 9edb3f6 to c371555 (7,104 new commits)...
Building from these channels:
  guix      https://git.savannah.gnu.org/git/guix.git   c371555
  nonguix   https://gitlab.com/nonguix/nonguix  026b5b5
substitute: updating substitutes from 'https://ci.guix.gnu.org'...   0.0%guix substitute: warning: ci.guix.gnu.org: host not found: Temporary failure in name resolution
substitute: 
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building /gnu/store/cmdhw4i6ln70g5gqwdk3crl9rcl58qlj-module-import.drv...
building /gnu/store/s6ba4v9g1kkx4jcz89zg4nz5hx0355q0-module-import.drv...
building /gnu/store/k2l4a55hx9z3lbs0abmm1rp7myq44b6v-module-import-compiled.drv...
building /gnu/store/jcrn0p00ab7fqx15mxf8kpjcj36bzd6w-module-import-compiled.drv...
building /gnu/store/8631kgbhp20qpm1cgh82krfxdqqq064n-compute-guix-derivation.drv...
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Backtrace:: 
          17 (primitive-load "/gnu/store/kp6x4l48fw37pkyh1jcb4h9i2w94q0kj-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:
  2168:24 12 (run-with-store #<store-connection 256.99 7f4f0bed9140> #<procedure 7f4ef60b4910 at ./guix/self.scm:13?> ?)
   1996:8 11 (_ #<store-connection 256.99 7f4f0bed9140>)
In ./guix/gexp.scm:
   299:22 10 (_ #<store-connection 256.99 7f4f0bed9140>)
   1180:2  9 (_ #<store-connection 256.99 7f4ef30fe370>)
   1046:2  8 (_ #<store-connection 256.99 7f4ef30fe370>)
    892:4  7 (_ #<store-connection 256.99 7f4ef30fe370>)
In ./guix/store.scm:
  2053:12  6 (_ #<store-connection 256.99 7f4ef30fe370>)
   1401:5  5 (map/accumulate-builds #<store-connection 256.99 7f4ef30fe370> #<procedure 7f4ef0c3b960 at ./guix/stor?> ?)
  1417:15  4 (_ #<store-connection 256.99 7f4ef30fe370> ("/gnu/store/1h366x1c1k8w50fy6daxbrxz2rw1in2i-guile-gcry?" ?) ?)
  1417:15  3 (loop #f)
   711:11  2 (process-stderr #<store-connection 256.99 7f4ef30fe370> _)
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/kp6x4l48fw37pkyh1jcb4h9i2w94q0kj-compute-guix-derivation'
failed to compute the derivation for Guix (version: "c371555a4b46a5c9288f54753b0f158f9c4b8abc"; system: "x86_64-linux";
host version: "868a1e7f320616e6a13aa23ea1ab86f7d40ddfdb"; pull-version: 1).
Please report the COMPLETE output above by email to <bug-guix@gnu.org>.