bug#41625: [PATCH v2] offload: Handle a possible EOF response from read-repl-response.

[Marius Bakke <marius@gnu.org>]

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Maxim Cournoyer <maxim.cournoyer@gmail.com> skriver:

>> Is running ‘guix offload test /etc/guix/machines.scm overdrive1’ on
>> berlin enough to reproduce the issue?  If so, we could monitor/strace
>> sshd on overdrive1 to get a better understanding of what’s going on.
>
> It's actually difficult to trigger it; it seems to happen mostly on the
> first try after a long time without connecting to the machine; on the
> 2nd and later tries, everything is smooth.  Waiting a few minutes is not
> enough to re-trigger the problem.
>
> I've managed to see the problem a few lucky times with:
>
> --8<---------------cut here---------------start------------->8---
> while true; do guix offload test /etc/guix/machines.scm overdrive1; done
> --8<---------------cut here---------------end--------------->8---

I used to be able to reproduce it by inducing a high load on the target
machine and just let Guix keep trying to connect.  But now I did that,
and set overload threshold to 0.0 for good measure, and Guix has been
waiting patiently for two hours without failure.

So AFAICT this bug has been fixed.  Perhaps Berlin or the Overdrive
simply needs to be updated?

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