general protection fault on boot.

[John Baldwin]

On Wednesday 09 September 2009 1:38:59 pm John Baldwin wrote:
> On Wednesday 09 September 2009 12:32:51 pm Vincent Hoffman wrote:
> > Hi all,
> >           I've been running the 8.0-BETAs in a xen virtual machine
> > (hvm/fully virtualised) for testing and something between r196730 and
> > r196746 causes a general protection fault on boot. I'll try and narrow
> > it down if i get a chance but I'm a a bit busy at the moment.
> >  
> > backtrace is available at
> > http://unsane.co.uk/~jhary/freebsd/GPF-09-09-09.gif 
> > Xen dom0 is a centos5.3 box using the xen-3.3.1 rpms from
> > http://www.gitco.de/linux/i386/centos/5/rpms/  if thats of any use.
> > 
> > Let me know if I need to provide any more info.
> 
> Hmm, can you try reverting 196737?  Or actually, can you print out the value 
> of %ebx ('p $ebx' in ddb will work I think)?  I wonder if this patch would 
> fix it:
> 
> Index: pmap.c
> ===================================================================
> --- pmap.c	(revision 196974)
> +++ pmap.c	(working copy)
> @@ -999,7 +999,7 @@
>  		 * coherence domain.
>  		 */
>  		mfence();
> -		for (; sva < eva; sva += cpu_clflush_line_size)
> +		for (; sva <= eva; sva += cpu_clflush_line_size)
>  			clflush(sva);
>  		mfence();
>  	} else {

This patch is probably bogus.  I am curious what %ebx is however.

-- 
John Baldwin