GNU bug report logs - #56674
[Shepherd] Use of ‘waitpid’, ‘system*’, etc. in service code can cause deadlocks

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Message #24 received at 56674 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: 56674 <at> debbugs.gnu.org
Cc: Mathieu Othacehe <othacehe <at> gnu.org>, 58926 <at> debbugs.gnu.org
Subject: Re: bug#58926: Shepherd becomes unresponsive after an interrupt
Date: Mon, 14 Nov 2022 17:32:35 +0100

Hello!

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

> These fresh Shepherd commits install a non-blocking ‘system*’ replacement:
>
>   975b0aa service: Provide a non-blocking replacement of 'system*'.
>   039c7a8 service: Spawn a fiber responsible for process monitoring.
>
> We’ll have to do more testing and probably go for a 0.9.3 release soon.

Shepherd commit ada88074f0ab7551fd0f3dce8bf06de971382e79 passes my
tests.  It definitely solves the wireguard example and similar things
(uses of ‘system*’ in service constructors/destructors); I can’t tell
for sure about nginx because I haven’t been able to reproduce it in a
VM.  I’m interested in ways to reproduce it.

It does look like we could go with 0.9.3 real soon now.

Ludo’.

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