re: xsrc/58133: X server crashes; radeon 5450; modesetting

[matthew green <mrg%eterna23.net@localhost>]

nice work on a good repro!  my remote-attempt that got a crash
in 6 hours but no core or gdb, has now been running for over
4 days without failure again.

i'll have a read throught the various code to see if i can spot
anything.

> Typing "c" for continue in gdb simply continued X without causing the
> expected crash.

FWIW, i've seen this "feature" multiple times, and i don't
think it is directly related to this problem.  something that
X is doing (and that other things can do) seems to set it up.

> - xsrc/external/mit/MesaLib.old/dist/src/gallium/winsys/radeon/drm/radeon_drm_bo.c

this is used on netbsd-10, not MesaLib (but the newer one is
used in -current.)  so it's expected this is what you'd get.