Re: domU freeze

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Oct 07, 2021 at 01:02:16PM +0000, Emmanuel Dreyfus wrote:
> Hello
> 
> I have the case of a domU that hangs every few hours. I am looking for
> hints about how to investigate it. 
> 
> The machine is quite critical, hence I had to setup a watcher scripts
> that reboots it when it stops answering pings. That makes manual inspection
> difficult.
> 
> A very frustrating point: this machine has been fine for years, and it 
> started crashing when I migrated it to a new dom0 (copied the kernel,
> rsync the filesystem). When I experienced a few crashes, I moved it 
> back to the dom0 where it worked fine, but now it keeps crashing.
> 
> dom0: NetBSD 9.2 / Xen 4.15.0
> domU: NetBSD 9.0 i386 PVH+shim. It uses ipf a lot.
> 
> I thought about rebuilding with a DDB_COMMANDONENTER that tells something
> (but what?), but it would not help since the machine does not panic. 
> Is there a way to script a domU into DDB from the dom0?

Yes, try
++++++
on the domU's console

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--