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

[David Rosenstrauch]

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