❯ guix time-machine --commit=7ae4cfa5aa5b48afc454c392055231a953f5b6c4
Updating channel 'guix' from Git repository at 'https://git.guix.gnu.org/guix.git'...
Computing Guix derivation for 'x86_64-linux'... /Backtrace:
          17 (primitive-load "/gnu/store/hrbg1jl968karbjfvmj8f09srhpf5nw4-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:
  2170:24 12 (run-with-store #<store-connection 256.100 70855b5aeaf0> #<procedure 708559fbe1e0 at guix/self.scm:130?> ?)
   1998:8 11 (_ #<store-connection 256.100 70855b5aeaf0>)
In guix/gexp.scm:
   299:22 10 (_ #<store-connection 256.100 70855b5aeaf0>)
   1180:2  9 (_ #<store-connection 256.100 70854d803aa0>)
   1046:2  8 (_ #<store-connection 256.100 70854d803aa0>)
    892:4  7 (_ #<store-connection 256.100 70854d803aa0>)
In guix/store.scm:
  2055:12  6 (_ #<store-connection 256.100 70854d803aa0>)
   1403:5  5 (map/accumulate-builds #<store-connection 256.100 70854d803aa0> #<procedure 70854a947ae0 at guix/store?> ?)
  1419:15  4 (_ #<store-connection 256.100 70854d803aa0> ("/gnu/store/wgifij2fzpdl2j7k51mw25qjjna40nn8-guile-ssh?" ?) ?)
  1419:15  3 (loop #f)
   713:11  2 (process-stderr #<store-connection 256.100 70854d803aa0> _)
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 time-machine: error: You found a bug: the program '/gnu/store/hrbg1jl968karbjfvmj8f09srhpf5nw4-compute-guix-derivation'
failed to compute the derivation for Guix (version: "7ae4cfa5aa5b48afc454c392055231a953f5b6c4"; system: "x86_64-linux";
host version: "f2c664190f766b489d12d8e21840d7467ecdabe1"; pull-version: 1).
Please report the COMPLETE output above by email to <https://codeberg.org/guix/guix/issues/>.