Re: systemd-shutdown disarms hardware watchdog when finished

[Lennart Poettering <lennart@xxxxxxxxxxxxxx>]

On Mi, 29.05.24 10:51, Andreas Svensson (andreas.svensson@xxxxxxxx) wrote:

> Hello,
>
> I have a system that should keep the hardware watchdog active while
> rebooting the system. It has worked fine up to systemd version v254.
>
> I noticed that since systemd version v254 my system stops the hardware
> watchdog after systemd-shutdown completes. I think it's the
> watchdog_free_device function that's responsible.
>
> The watchdog_free_device function will call watchdog_set_device(NULL) from
> watchdog.h. Since commit f81048f8 the watchdog will be disarmed and stopped
> if changed in watchdog_set_device.
>
> There's a comment just above watchdog_free_device in shutdown.c that
> contradicts what's actually happening right now: "Note that the watchdog is
> explicitly not stopped here".
>
> Is this the intended behavior? Anything I can do to get my system back to
> its behavior before version v254 where my hardware watchdog is still
> active/running after systemd-shutdown has finished?

Yes, this is a bug and a regression.

Can you file an issue on github about this please?

(even better provide a PR that fixes this)

Lennart

--
Lennart Poettering, Berlin