Removing VGA card panics the box on boot

[Marcel Moolenaar]

On Mon, Nov 15, 2004 at 10:16:59AM +0200, Ruslan Ermilov wrote:
> Hi there,
> 
> I needed the unused PCI VGA card for testing another machine,
> so I pulled it out from my AlphaPC 164SX, and that gave me an
> instant panic on boot:
> 
> : Timecounter "i8254" frequency 1193182 Hz quality 0
> : Timecounter "alpha" frequency 533183689 Hz quality 800
> : Timecounters tick every 0.976 msec
> : panic: mtx_lock() of spin mutex (null) @ /usr/src/sys/netinet/igmp.c:431
> : cpuid = 0
> : KDB: enter: panic
> : [thread 100004]
> : Stopped at      kdb_enter+0x48: or      zero,zero,zero  <zero=0x0>
> : db> 
> 
> Putting it back in results in normal behavior (no panic).
> Any hints?

Typically only syscons cares about having a VGA adapter. I don't see
if you have syscons configured or not, but assume you have. I also
don't see it mentioned wether you normally use a serial console or a
graphical console. So, it's hard to come up with any good hints.

My first guess would be: remove syscons (or remove the hint from
/boot/device.hints. Make sure you have a suitable alternative for
the console. I forgot if promcons could survive multi-user mode,
so you may want to have sio(4) or uart(4) lined up as the console.

-- 
 Marcel Moolenaar	  USPA: A-39004		 marcel at xcllnt.net