Date: Wed, 23 May 2012 16:49:49 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Ian FREISLICH <ianf@clue.co.za> Cc: freebsd-current@freebsd.org Subject: Re: (no subject) Message-ID: <20120523134949.GD2358@deviant.kiev.zoral.com.ua> In-Reply-To: <E1SXBpO-0001ep-Ei@clue.co.za> References: <201205230930.03282.jhb@freebsd.org> <201205221641.13091.jhb@freebsd.org> <E1SWtwE-0000Ru-Eu@clue.co.za> <E1SX3Bt-0000qb-JF@clue.co.za> <E1SXBpO-0001ep-Ei@clue.co.za>
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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.
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