Removing VGA card panics the box on boot

[Ruslan Ermilov]

On Mon, Nov 15, 2004 at 11:12:49AM -0500, John Baldwin wrote:
> On Monday 15 November 2004 03:16 am, 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?
> 
> Sounds like something is messing with free'd memory through a stale pointer 
> and happens to be trashing that spin mutex as a result.  Not sure on how to 
> track it down however.
> 
The funny thing is that it happens in exactly this same place,
and only when I pull the VGA card out.  ;)


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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