GNU bug report logs - #55444
elogind startup race between shepherd and dbus-daemon

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Message #10 received at 55444 <at> debbugs.gnu.org (full text, mbox):

From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 55444 <at> debbugs.gnu.org
Subject: Re: bug#55444: elogind startup race between shepherd and dbus-daemon
Date: Mon, 23 May 2022 22:27:20 -0400

Hi,

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

> Hello!
>
> Currently (40a729a0e6f1d660b942241416c1e2c567616d4d), shepherd and
> dbus-daemon compete to start elogind: shepherd tries to start it
> eagerly, and dbus-daemon starts it on-demand upon bus activation.
>
> Sometimes dbus-daemon wins, and thus shepherd tries a few times to start
> it anyway, leading to the infamous:
>
>   elogind is already running as PID 123

Do we have a system test that sometimes reproduce it, or at least the
above message?  I have some branch where I introduce some D-Bus
synchronization primitives I had started to fix
https://issues.guix.gnu.org/issue/52051, which ended up being fixed
differently (bumping the timeout value); perhaps it could be of use
here.

Thanks,

Maxim

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