Leo Famulari 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 #) In ice-9/boot-9.scm: 718:2 3 (call-with-prompt _ _ #) In ice-9/eval.scm: 619:8 2 (_ #(#(#))) 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.