page fault while in kernel mode - after upgrade from 12.2 to 13.0

[Mark Johnston]

On Wed, May 05, 2021 at 06:35:32PM +0200, Michael Schmiedgen wrote:
> On 04.05.2021 21:02, Mark Johnston wrote:
> > This looks like fairly random kernel memory corruption.  Are you able to
> > build an INVARIANTS kernel and test that?  Assuming you're using 13.0,
> > you'd grab the 13.0 sources, add "options INVARIANT_SUPPORT" and
> > "options INVARIANTS" to the GENERIC kernel configuration in
> > sys/amd64/conf, and do a "make buildkernel installkernel".
> 
> Below some info with an INVARIANTS kernel. Please let me know if I can provide
> further information. Thank you!

Thanks, this helped a lot.  I believe https://reviews.freebsd.org/D30129
will fix the problem.  That patch is against the main branch but applies
cleanly to 13.0.