bug#53668: Updating substitutes on LAN hosts dies unexpectedly

[Maxim Cournoyer]

Hi Simon,

Simon Streit <simon@netpanic.org> writes:

> Hello,
>
> quite often, and quite randomly I run into this situation that whenever
> Guix tries to rebuild a profile, and sometimes while downloading from
> local Guix hosts sharing their store items, the process will crash with
> the following error:
>
> ~ $1 reconfigure
> substitute: updating substitutes from 'http://192.168.0.157:3000'...  
> 56.3%Backtrace:
> substitute: In ice-9/boot-9.scm:
> substitute:   1752:10 17 (with-exception-handler _ _ #:unwind? _ # _)
> substitute: In unknown file:
> substitute:           16 (apply-smob/0 #<thunk 7f309a1caf60>)
> substitute: In ice-9/boot-9.scm:
> substitute:     724:2 15 (call-with-prompt _ _ #<procedure 
> default-prompt-handle…>)
> substitute: In ice-9/eval.scm:
> substitute:     619:8 14 (_ #(#(#<directory (guile-user) 7f309a1c4c80>)))
> substitute: In guix/ui.scm:
> substitute:    2206:7 13 (run-guix . _)
> substitute:   2169:10 12 (run-guix-command _ . _)
> substitute: In ice-9/boot-9.scm:
> substitute:   1752:10 11 (with-exception-handler _ _ #:unwind? _ # _)
> substitute:   1752:10 10 (with-exception-handler _ _ #:unwind? _ # _)
> substitute: In guix/scripts/substitute.scm:
> substitute:    757:18  9 (_)
> substitute:    348:26  8 (process-query #<output: file 4> _ #:cache-urls _ 
> #:acl _)
> substitute: In guix/substitutes.scm:
> substitute:    365:27  7 (lookup-narinfos/diverse _ _ #<procedure 
> 7f309690d320 …> …)
> substitute:    322:31  6 (lookup-narinfos _ _ #:open-connection _ # _)
> substitute:    245:26  5 (fetch-narinfos _ _ #:open-connection _ # _)
> substitute: In ice-9/boot-9.scm:
> substitute:   1685:16  4 (raise-exception _ #:continuable? _)
> substitute:   1685:16  3 (raise-exception _ #:continuable? _)
> substitute:   1780:13  2 (_ #<&compound-exception components: 
> (#<&assertion-fail…>)
> substitute:   1685:16  1 (raise-exception _ #:continuable? _)
> substitute:   1685:16  0 (raise-exception _ #:continuable? _)
> substitute:
> substitute: ice-9/boot-9.scm:1685:16: In procedure raise-exception:
> substitute: Wrong type (expecting exact integer): #f
> guix system: error: 
> `/gnu/store/kcc8zh1fhp05wgw2m48w3gk228j39f5q-guix-1.3.0-21.e427593/bin/guix 
> substitute' died unexpectedly

I suffer from this routinely on my slow HDD machine.  I attribute the
failure to some timeout that isn't reported correctly by guile-ssh.
Perhaps related to
https://github.com/artyom-poptsov/guile-ssh/issues/29; there's a new
update of guile-ssh to try that Artyom has put up on guix-patches; we
should test it.

Thanks,

Maxim