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To: Konstantin Belousov <kostikbel@gmail.com>
From: Ian FREISLICH <ianf@clue.co.za>
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Subject: Re: (no subject) (was panic in vfs_lookup/kern_statat_vnhook?)
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Konstantin Belousov wrote:
> On Wed, May 23, 2012 at 03:42:14PM +0200, Ian FREISLICH wrote:
> > John Baldwin wrote:
> > > On Wednesday, May 23, 2012 12:28:53 am Ian FREISLICH wrote:
> > > > (kgdb) frame 7
> > > > #7  0xc0878682 in pmap_enter (pmap=3D0xc09e4060, va=3D3359633408, acc=
> ess=3D7 '\a'
> > ,=20
> > > >     m=3D0xc191bf70, prot=3D7 '\a', wired=3D1) at=20
> > > /usr/src/sys/i386/i386/pmap.c:1596
> > > > 1596                    root =3D vm_page_splay(mpte->pindex, root);
> > > > (kgdb) l
> > > > 1591            root =3D pmap->pm_root;
> > > > 1592            if (root =3D=3D NULL) {
> > > > 1593                    mpte->left =3D NULL;
> > > > 1594                    mpte->right =3D NULL;
> > > > 1595            } else {
> > > > 1596                    root =3D vm_page_splay(mpte->pindex, root);
> > > > 1597                    if (mpte->pindex < root->pindex) {
> > > > 1598                            mpte->left =3D root->left;
> > > > 1599                            mpte->right =3D root;
> > > > 1600                            root->left =3D NULL;
> > >=20
> > > Ok, can you do 'p root', 'p mpte', and 'p *mpte'?
> >=20
> > (kgdb) frame 7
> > #7  0xc0878682 in pmap_enter (pmap=3D0xc09e4060, va=3D3359633408, access=
> =3D7 '\a',=20
> >     m=3D0xc191bf70, prot=3D7 '\a', wired=3D1) at /usr/src/sys/i386/i386/p=
> map.c:1596
> > 1596                    root =3D vm_page_splay(mpte->pindex, root);
> > (kgdb) p root
> > No symbol "root" in current context.
> > (kgdb) p mpte
> > $1 =3D 0x0
> > (kgdb) p *mpte
> > Cannot access memory at address 0x0
> 
> Do you have r235776 in your tree ? This could be another manifestation of
> this bug.

I'm not sure.  I'm still using cvs.  But, it happened with sources
updated last night if that helps.

Ian

-- 
Ian Freislich