[arch-general] Linux server crash causing router switch to stop working

[mick howe]

seems so obvious you already illuminated it but some buffer not
clearing old data?

mick in glen innes 2370

On Fri, 11 Feb 2022 at 09:32, David Rosenstrauch via arch-general
<arch-general at lists.archlinux.org> wrote:
>
> Following up on this crash issue I keep having with my Arch server.
> Basically server just completely freezes up - doesn't respond to pings,
> or keyboard/mouse input, and eventually has to just be rebooted.
>
> Good news is:
>
> a) after upgrading everything (including the router firmware) it no
> longer seems to hang my entire router/network (yay!)
>
> b) I was able to get a screenshot of the issue (more details about that
> below)
>
> Bad news is:
>
> It keeps happening! (About once a week or so.)
>
>
> I was able to capture a screenshot from the VM.  (See
> http://darose.net/ServerCrash20220209.png)  Basically this is the only
> thing that's providing me with any detail as to why it's crashing:
> "rcu_preempt detected stalls on cpus/tasks".  But searching on that
> phrase didn't really give any clear indication what the problem might
> be.  Plus the rest of the details from that message got obscured in the
> garbled video output.
>
>
> Any thoughts/suggestions as to what might be happening here / how to
> debug welcome!
>
> Thanks,
>
> DR
>
>
> On 1/21/22 12:54 PM, David Rosenstrauch wrote:
> > Been experiencing a weird issue several times recently that's got me
> > stumped.
> >
> > A couple of weeks ago, my entire home network went dead right in the
> > middle of a zoom call.  Same problem happened again late last night. The
> > problem is intermittent/occasional:  everything runs without issue for
> > several days, then suddenly crashes.
> >
> > I figured the issue was a problem with my wifi router, but after much
> > debugging I don't think that's the case.  I have a new (Arch) linux
> > server I built a few weeks ago.  What seems to be happening is that my
> > server crashes for some reason
>