Re: kern/53072: netbsd-8 regression: startx (nv driver) crashes system

[Roy Bixler <rcbixler%nyx.net@localhost>]

On Mon, Mar 05, 2018 at 08:00:02AM +0000, matthew green wrote:
> The following reply was made to PR kern/53072; it has been noted by GNATS.
> 
> From: matthew green <mrg%eterna.com.au@localhost>
> To: gnats-bugs%NetBSD.org@localhost, rcbixler%nyx.net@localhost
> Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
>     netbsd-bugs%netbsd.org@localhost
> Subject: re: kern/53072: netbsd-8 regression: startx (nv driver) crashes system
> Date: Mon, 05 Mar 2018 18:57:19 +1100
> 
>  > _KERNEL_OPT_NARCNET(0,104,c011e2a5,8,c0fff385,0,104,c0f73de5,dabefc5c,da=
>  befc40) a
>  > t 0
>  > __kernel_end(104,0,c0f73de5,dabefc5c,c2b6ed40,6,dabefce4,dabefc50,c0947c=
>  9a,c0f73
>  > de5) at dabefc5c
>  > vpanic(c0f73de5,dabefc5c,dabefcd8,c0120935,c0f73de5,dabefce4,dabefce4,1,=
>  dabed2c0
>  > ,13246) at vpanic+0x131
>  > snprintf(c0f73de5,dabefce4,dabefce4,1,dabed2c0,13246,8,0,0,0) at snprint=
>  f
>  > trap_tss() at trap_tss
>  > --- trap via task gate ---
>  > _KERNEL_OPT_BEEP_ONHALT_COUNT+0x2:
>  
>  this is from crash(8)?  can you try gdb, see if it can trace
>  through the trap and where it really is happening?
>  
>  this probably is some teardown issue, as it seems that X tries
>  and then fails, and then we crash.  can you try the vesa driver
>  for now, it should have a reasonably performance until we
>  figure this problem out.
>  
>  
>  .mrg.
>  

I've run out of time for now, but I was able to confirm that a kernel
built from CVS as of 27 Feb. 2018 0900Z doesn't have the problem, but
a kernel build from CVS as of 27 Feb. 2018 1000Z does have the
problem.  I also confirmed that I am unable to use X at all with the
latter.  I tried the vesa driver and the wsfb driver with vesa mode
and those crash as well.  I guess, if I want to use X, I'll be
restricted to using the 27 Feb. 2018 0900Z build or -current.

-- 
Roy Bixler <rcbixler%nyx.net@localhost>
"The fundamental principle of science, the definition almost, is this: the
sole test of the validity of any idea is experiment."
-- Richard P. Feynman