GNU bug report logs - #53225
shepherd freezes if wireguard is started with dns config enabled

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Nathan Dehnel <ncdehnel <at> gmail.com>
Subject: bug#53225: closed (Re: bug#58926: Shepherd becomes unresponsive
 after an interrupt)
Date: Thu, 17 Nov 2022 10:24:03 +0000

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Your bug report

#53225: shepherd freezes if wireguard is started with dns config enabled

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 53225 <at> debbugs.gnu.org.

-- 
53225: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=53225
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Mathieu Othacehe <othacehe <at> gnu.org>
Cc: 53225-done <at> debbugs.gnu.org, 58926-done <at> debbugs.gnu.org
Subject: Re: bug#58926: Shepherd becomes unresponsive after an interrupt
Date: Thu, 17 Nov 2022 11:23:09 +0100

Hi,

Ludovic Courtès <ludo <at> gnu.org> skribis:

> Mathieu Othacehe <othacehe <at> gnu.org> skribis:
>
>> 1. On my laptop with a Wireguard service trying to reach a non-existing
>> DNS server.
>>
>>             (service wireguard-service-type
>>                      (wireguard-configuration
>>                       (addresses (list "10.0.0.2/24"))
>>                       (dns '("10.0.0.50")) #does not exit
>
> This one is similar to:
>
>   https://issues.guix.gnu.org/53225
>   https://issues.guix.gnu.org/53381
>
> It has to do with the fact that “wg-quick up” blocks until it succeeds
> and that ‘invoke’ gets stuck on ‘waitpid’ until the “wg-quick” process
> terminates.
>
> The solution will be to use something non-blocking instead of ‘invoke’;
> I’m looking into it.

This is fixed in the Shepherd 0.9.3, which landed in Guix commit
283d7318c5b312d7129adb6dbeea6ad205ce89d1.

As I wrote, I’m not sure whether it fixes the nginx situation since I
could not reproduce it.  I’m closing and let’s open a new issue
specifically for nginx if it comes up again with 0.9.3.

Thanks,
Ludo’.

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From: Nathan Dehnel <ncdehnel <at> gmail.com>
To: Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix <at> gnu.org>
Subject: shepherd freezes if wireguard is started with dns config enabled
Date: Wed, 12 Jan 2022 18:27:24 -0600

When dns is specified, wireguard runs wg-quick, which runs resolvconf,
which runs /run/current-system/profile/bin/herd restart, which causes
shepherd to freeze because I guess it doesn't like being given
multiple start commands at once. I'm not sure how to fix it.

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