Bug from guix pull

This is the output from guix pull:

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Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...

Authenticating channel 'guix', commits 9edb3f6 to ffb616b (33 new commits)...

Building from this channel:

guix https://git.savannah.gnu.org/git/guix.git ffb616b

substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%

substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%

substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%

config.scm 501B 6KiB/s 00:00 [##################] 100.0%

git.scm 101B 6KiB/s 00:00 [##################] 100.0%

hash.scm 132B 40KiB/s 00:00 [##################] 100.0%

module-import 2KiB 21KiB/s 00:00 [##################] 100.0%

module-import-compiled 972KiB/s 00:02 | 1.5MiB transferred

compute-guix-derivation 1007B 151KiB/s 00:00 [##################] 100.0%

Computing Guix derivation for 'x86_64-linux'... \Backtrace:

17 (primitive-load "/gnu/store/zgzaz6c723pjkykiqnpnqr9rmylf69dq-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:

2129:24 12 (run-with-store #<store-connection 256.99 7f48d025d140> #<procedure 7f48c0328aa0 at ./guix/self.scm:12?> ?)

1966:8 11 (_ #<store-connection 256.99 7f48d025d140>)

In ./guix/gexp.scm:

299:22 10 (_ #<store-connection 256.99 7f48d025d140>)

1180:2 9 (_ #<store-connection 256.99 7f48b8ed2b90>)

1046:2 8 (_ #<store-connection 256.99 7f48b8ed2b90>)

892:4 7 (_ #<store-connection 256.99 7f48b8ed2b90>)

In ./guix/store.scm:

2014:12 6 (_ #<store-connection 256.99 7f48b8ed2b90>)

1406:5 5 (map/accumulate-builds #<store-connection 256.99 7f48b8ed2b90> #<procedure 7f48c6e1b7c0 at ./guix/stor?> ?)

1421:15 4 (_ #<store-connection 256.99 7f48b8ed2b90> ("/gnu/store/bxj1khnh32gwzc4ly1nrrddk933ns55k-guile-ssh-?" ?) ?)

1421:15 3 (loop #f)

733:11 2 (process-stderr #<store-connection 256.99 7f48b8ed2b90> _)

In ./guix/serialization.scm:

102:11 1 (read-int #<input-output: file 10>)

80:6 0 (get-bytevector-n* #<input-output: file 10> 8)

./guix/serialization.scm:80:6: 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/zgzaz6c723pjkykiqnpnqr9rmylf69dq-compute-guix-derivation'

failed to compute the derivation for Guix (version: "ffb616b69dced25b840f2e5178062072d89623eb"; system: "x86_64-linux";

host version: "6b677f4299f38ea70e1852388086ee95c2c48622"; pull-version: 1).

Please report the COMPLETE output above by email to <bug-guix@gnu.org>.

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Please let me know if any more information is useful.