Not exactly sure what to report, but:

    $ guix pull
    Building from this channel:
      guix      https://git.savannah.gnu.org/git/guix.git   9c6ea3c
    Computing Guix derivation for 'x86_64-linux'... \guix pull: error: You found a bug: the program '/gnu/store/94yr3a44i33635b90lhbji5rixkyijvg-compute-guix-derivation'
    failed to compute the derivation for Guix (version: "9c6ea3cb5617a1928073f41f174765ab14adbaa9"; system: "x86_64-linux";
    host version: "2971ed57345ee4e00058efeaf27c6a0790fdc9dd"; pull-version: 1).
    Please report it by email to <bug-guix@gnu.org>.