kpanic on install >32GB of RAM [SEC=UNCLASSIFIED]

[Kostik Belousov]

On Thu, Oct 21, 2010 at 09:50:03AM -0700, Sean Bruno wrote:
> On Thu, 2010-10-21 at 05:48 -0700, Andriy Gapon wrote:
> > on 20/10/2010 21:28 Sean Bruno said the following:
> > > I guess, I could replace the kernel on the CD and have them reburn it?
> > 
> > That should work.
> > BTW, here I described "yet another" way of building custom recovery/installation
> > CDs that I use:
> > http://wiki.freebsd.org/AvgLiveCD
> > 
> 
> Before I get started on this, it looks like something else is going on.
> 
> Here is a panic + trace on the latest 9-current snap shot.  "hammer
> time" indeed.  
> 
> Suggestions are welcome!
> 
> 
> http://people.freebsd.org/~sbruno/9-current-panic.png
> 
> http://people.freebsd.org/~sbruno/9-current-trace-panic.png

It feels like msgbufp variable has absurd value. Can you arrange
to get the output of verbose boot, esp. the SMAP lines ?
Also, you could add printfs near amd64/amd64/machdep.c:1517
	/* Map the message buffer. */
	msgbufp = (struct msgbuf *)PHYS_TO_DMAP(phys_avail[pa_indx]);
to show the values of all participants, i.e. msgbufp, pa_indx
and phys_avail[pa_indx].
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