On Thu, Aug 22, 2002 at 10:23:16AM -0700, Andrey Petrov wrote:

 > I'm not sure if that hme or not but the following patch fixed
 > 'signal 11' during NFS build for me. I have some theory about
 > aliased shared pages, but it's just guess with no prove at this 
 > point.

Please check this patch in.  For a write-back cache, when MOD is cleared,
the cache *must* be written-back, otherwise it is possible for data to
be lost.

 > 
 > 	Andrey
 > 
 > Index: pmap.c
 > ===================================================================
 > RCS file: /cvsroot/syssrc/sys/arch/sparc64/sparc64/pmap.c,v
 > retrieving revision 1.125
 > diff -u -p -r1.125 pmap.c
 > --- pmap.c      2002/08/12 12:04:31     1.125
 > +++ pmap.c      2002/08/22 17:14:52
 > @@ -2805,6 +2805,7 @@ pmap_clear_modify(pg)
 >                                 changed |= 1;
 >                         pv->pv_va &= ~(PV_MOD);
 >                         simple_unlock(&pv->pv_pmap->pm_lock);
 > +                       dcache_flush_page(pa);
 >                 }
 >         splx(s);
 >         pv_check();

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>