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bug#34033: Offloading sometimes hangs

From: Maxim Cournoyer
Subject: bug#34033: Offloading sometimes hangs
Date: Fri, 21 Feb 2020 23:37:06 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)

Hello Ludovic,

Ludovic Courtès <address@hidden> writes:

> Hello,
> Ludovic Courtès <address@hidden> skribis:
>> A simple thing would be to somehow get libssh to pass POLLIN | POLLRDHUP
>> instead of just POLLIN.
> Reported here:
>   https://www.libssh.org/archive/libssh/2019-01/0000000.html
> A fix has been proposed by upstream and should be committed shortly.
>> Additionally, we could change Guile-SSH so that we can specify a timeout
>> when reading from a channel.
> Turns out we can set a per-session timeout, which we already do (see
> #:timeout in ‘open-ssh-session’ in (guix scripts offload)) but
> ‘ssh_channel_read’ would ignore it and instead pass an infinite timeout
> to poll(2):
>   https://www.libssh.org/archive/libssh/2019-01/0000001.html
> This issue happens to be fixed in libssh 0.8.x, so I upgraded our libssh
> package in commit a8b0556ea1e439c89dc1ba33c8864e8b9b811f08.
> (That still doesn’t tell us why our ‘guix offload’ processes would
> occasionally be stuck but at least it ensures the build farm keeps
> making progress even when that happens.)
> Ludo’.

Seems the patch in the response at the URL you linked is awaiting some
feedback/review.  Is this the reason 'guix substitute' hangs for so long
when the substitute server is down? (like 1 minute or so).


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