bug#45828: guix build: error: got unexpected path `Backtrace:' from substituter

[Christopher Baines]

Leo Famulari <leo@famulari.name> writes:

> Recently, many people on the #guix IRC channel reported frequent
> non-deterministic failures of any operation involving substitution, like
> this:
>
> ------
> $ ./pre-inst-env guix build --no-grafts poezio mpdris2 sonata beets-bandcamp 
> beets
> substitute: 
> guix build: error: got unexpected path `Backtrace:' from substituter
> ------
>
> `guix describe` reports commit b4384e61165623b16b77b8cab16c81423c6853ed
> for both my user's Guix and the guix-dameon.

I might have managed to reproduce the error happening on the daemon
side:

→ /gnu/store/4j8vn0gbqz5adj1y02nnwcfwmqsjgj8s-guix-1.2.0-6.799f066/bin/guix 
substitute --query
info /gnu/store/3c01q1f16kljfry70qjg6cs6k8winfzg-guix-package-cache 
/gnu/store/6lk8anal4s62gk3d30vgxppykbd5jcfj-guix-85e97c969 
/gnu/store/9zl2zbh3q2jnbfvxgnhw8j3f637ni7z4-guix-cli 
/gnu/store/ihricijvy16zwkd2n671xlyrn02sqhf9-guix-manual 
/gnu/store/m3j427qnlp81vsdj3x9ds7s4i051r1vz-guix-system-tests 
/gnu/store/mbv9j7wwqvwnr5awzbi126jdsj3h64h5-guix-packages 
/gnu/store/n2m1ay7kpa5f4fls4vvcy46ar1fdl0wk-guix-system 
/gnu/store/p4q9ajlb3l7x8xglqs6fflch2iwjqwaj-guix-module-union 
/gnu/store/snhx33fgjj2xnc5vy96sr3c8jqw9c7s0-guix-85e97c969-modules 
/gnu/store/vnrlvz9pxl5qrpy5x8y51v6awz7yzn8q-guix-packages-base 
/gnu/store/z4wj18vyzaas2yqb0577cc3japy4fi7z-guix-config 
/gnu/store/zdjfbsj1a94vdbbg9r0cx4jcqnwxazxs-guix-translated-texinfo
Backtrace:
In ice-9/boot-9.scm:
  1736:10  5 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
           4 (apply-smob/0 #<thunk 7f23d4f2e380>)
In ice-9/boot-9.scm:
    718:2  3 (call-with-prompt _ _ #<procedure default-prompt-handle…>)
In ice-9/eval.scm:
    619:8  2 (_ #(#(#<directory (guile-user) 7f23d4b70f00>)))
In guix/ui.scm:
  2127:12  1 (run-guix-command _ . _)
In guix/scripts/substitute.scm:
   1256:4  0 (guix-substitute . _)

guix/scripts/substitute.scm:1256:4: In procedure guix-substitute:
Throw to key `bad-response' with args `("Bad Response-Line: ~s" (""))'.


It's hard to tell if that's actually consistent with the error
though. Repeating the same test after the restart of guix-publish on
ci.guix.gnu.org works without printing a backtrace.

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