NetBSD 9.99.93 kernel crash with Firefox, Lariza and Mate

[Matthias Petermann <mp%petermann-it.de@localhost>]

Hello all,

given here runs a NetBSD 9.99.93 (built from the sources from 
22.01.2022). The system runs with Xorg (Intel KMS) so far quite stable. 
However, several X-applications crash the system reproducibly, each time 
a kernel crash with core dump and reboot happens.

First I noticed this with Firefox. Likewise with Lariza, which I tried 
as an alternative browser. It also happens when I try to start a mate 
session in Xorg.

If I avoid the above applications and use Awesome window manager, I can 
work for hours with multiple xterms without crashing.

I don't see a clear pattern behind this at the moment. I had suspected 
that it might have something to do with hardware acceleration. I have 
turned off hardware acceleration in Firefox because I had display 
problems with it under NetBSD 9.2, but this did not change anything for 
NetBSD 9.99.93.

To get further details, I tried to open one of the core dumps in gdb. 
Unfortunately it can't read the symbols (what would I have to do to make 
it do that?).

```
$ gdb  --symbols=netbsd.0 --quiet --eval-command="file netbsd.0" 
--eval-command="target kvm netbsd.0.core" --eval-command "bt" 
--eval-command "list" --eval-command "info all-registers"

Reading symbols from netbsd.0...
(No debugging symbols found in netbsd.0)
Reading symbols from netbsd.0...
(No debugging symbols found in netbsd.0)
0xffffffff802261f5 in cpu_reboot ()
#0  0xffffffff802261f5 in cpu_reboot ()
#1  0xffffffff80dbe8d4 in kern_reboot ()
#2  0xffffffff80e018c2 in vpanic ()
#3  0xffffffff80e01987 in panic ()
#4  0xffffffff80229017 in trap ()
#5  0xffffffff802210e3 in alltraps ()
#6  0xffffffff80d7a30c in uvn_findpage ()
#7  0xffffffff80d7a70f in uvn_findpages ()
#8  0xffffffff80e7f7d3 in genfs_getpages ()
#9  0xffffffff80e7cd52 in VOP_GETPAGES ()
#10 0xffffffff80d7a0fa in uvn_get ()
#11 0xffffffff80d5b0cc in uvm_fault_internal ()
#12 0xffffffff80228970 in trap ()
#13 0xffffffff802210e3 in alltraps ()
No symbol table is loaded.  Use the "file" command.
```

Has anyone recently observed anything similar?

Kind regards
Matthias