page fault panic in vm system

Peter Avalos peter at
Sun Jul 10 01:50:39 PDT 2011

On Sat, Jul 09, 2011 at 01:15:21PM -1000, Peter Avalos wrote:
> On Sat, Jul 09, 2011 at 04:01:29PM -0700, Matthew Dillon wrote:
> > 
> >     This is vm_page_rb_tree_RB_LOOKUP() .. the red-black lookup code
> >     for a vm_page in an object.  Called from vm_page_lookup().
> > 
> >     Currently the global vm_token protects that field.  I didn't see any
> >     particular race there but the problem could be related to a more
> >     general reference count problem with VM objects.
> > 
> Ok, so it looks like it's the original panic then.  Are the vmcores any
> help to figure out what's going on?

I just got the same panic on a more recent kernel, but the backtrace
looks the same.  It's available at:

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