On Fri, Apr 28, 2017 at 11:29:50AM -0500, Christopher Allan Webber wrote:
> I am getting this error right now on multiple machines:
> 
>   substitute: updating list of substitutes from 'http://mirror.hydra.gnu.org'... 100.0%
>   substitute: updating list of substitutes from 'http://mirror.hydra.gnu.org'... 100.0%
>   substitute: updating list of substitutes from 'http://mirror.hydra.gnu.org'...  66.7%Backtrace:
>   substitute: In ice-9/boot-9.scm:
>   substitute:  160: 9 [catch #t #<catch-closure 1d5ba00> ...]
>   substitute: In unknown file:
>   substitute:    ?: 8 [apply-smob/1 #<catch-closure 1d5ba00>]
>   substitute: In ice-9/boot-9.scm:
>   substitute:   66: 7 [call-with-prompt prompt0 ...]
>   substitute: In ice-9/eval.scm:
>   substitute:  432: 6 [eval # #]
>   substitute: In ice-9/boot-9.scm:
>   substitute: 2412: 5 [save-module-excursion #<procedure 1d7c900 at ice-9/boot-9.scm:4084:3 ()>]
>   substitute: 4089: 4 [#<procedure 1d7c900 at ice-9/boot-9.scm:4084:3 ()>]
>   substitute: 1734: 3 [%start-stack load-stack ...]
>   substitute: 1739: 2 [#<procedure 1d8eb40 ()>]
>   substitute: In unknown file:
>   substitute:    ?: 1 [primitive-load "/gnu/store/nqy9m6hhnkkfwr5wyq5bac96v9s9hc9i-guix-0.12.0-9.25a4/bin/.guix-real"]
>   substitute: In guix/ui.scm:
>   substitute: 1255: 0 [run-guix-command substitute "--query"]
>   substitute:
>   substitute: guix/ui.scm:1255:8: In procedure run-guix-command:
>   substitute: guix/ui.scm:1255:8: Throw to key `bad-response' with args `("Bad Response-Line: ~s" (""))'.
>   guix environment: error: build failed: substituter `substitute' died unexpectedly

Same here. It kills the Guix process even if --fallback is used.