Re: assertion "pve == NULL" failed

[Andrew Doran <ad%netbsd.org@localhost>]

On Wed, Mar 04, 2020 at 11:41:33AM +0000, Patrick Welche wrote:

> Netbooting (uefi) a -current/amd64 kernel from yesterday morning,
> with a serial console, I just had
> 
> [ 131.6333574] panic: kernel diagnostic assertion "pve == NULL" failed: file "/ 
> [ 131.7633964] cpu8: Begin traceback...
> [ 131.8134059] vpanic() at netbsd:vpanic+0x178
> [ 131.8634212] kern_assert() at netbsd:kern_assert+0x48
> [ 131.9234393] pmap_remove_pv() at netbsd:pmap_remove_pv+0x2e3
> [ 131.9834571] pmap_enter_ma() at netbsd:pmap_enter_ma+0x7aa
> [ 132.0534782] pmap_enter_default() at netbsd:pmap_enter_default+0x29
> [ 132.1234992] uvm_fault_lower_enter() at netbsd:uvm_fault_lower_enter+0x111
> [ 132.2035233] uvm_fault_internal() at netbsd:uvm_fault_internal+0x12c2
> [ 132.2835474] trap() at netbsd:trap+0x6f4
> [ 132.3235594] --- trap (number 6) ---
> [ 132.3635714] 7f7ef58009ee:
> 
> when hitting return at
> 
> /etc/rc.conf is not configured.  Multiuser boot aborted.
> Enter pathname of shell or RETURN for /bin/sh:
> 
> (am in ddb if that helps - unfortunately I cvs updated the source in
> the meantime)

I wonder if this has the same root as ..

https://syzkaller.appspot.com/bug?id=ada8326eeb74dd1bab60e8677adacd95afb04ce7

.. which has been around for a while, but due to small changes in the pmap
it now goes down the path with the assertion more readily.  I don't see the
problem but will look in depth this weekend.

Thank you,
Andrew