Date: Thu, 14 Sep 2006 18:40:05 +0400 From: Sergey Zaharchenko <doublef-ctm@yandex.ru> To: Robert Watson <rwatson@FreeBSD.org> Cc: Peter Jeremy <peterjeremy@optushome.com.au>, "Christian S.J. Peron" <csjp@FreeBSD.org>, current@freebsd.org Subject: Re: NULL pointer dereference panic [resurrected] Message-ID: <20060914144005.GA90248@shark.localdomain> In-Reply-To: <20060619092805.F8526@fledge.watson.org> References: <20060618192011.GF715@turion.vk2pj.dyndns.org> <44960E61.5000808@FreeBSD.org> <20060619092805.F8526@fledge.watson.org>
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Hello Robert!
Mon, Jun 19, 2006 at 09:29:25AM +0100 you wrote:
> Wojciech Koszek has been doing some work to debug a related pty/pts/devfs=
=20
> problem, and mentioned to me a day or so ago that he may have identified =
a=20
> workaround (and maybe a fix)? If this panic is a result of the same or a=
=20
> related problem, his work may be relevant. I've CC'd him.
I've observed this same panic on a fresh(er) -CURRENT (and, certainly,
have a dump). This is on a UP system.
(kgdb) frame 14
#14 0xc06f5f24 in vop_stdgetwritemount (ap=3D0xd5c9aa2c)
at /src/usr.src/sys/kern/vfs_default.c:356
356 vfs_ref(mp);
(kgdb) l
351 * will be set to NULL. We only have to prevent this call =
=66rom
352 * returning with a ref to an incorrect mountpoint. It is =
not
353 * harmful to return with a ref to our previous mountpoint.
354 */
355 mp =3D ap->a_vp->v_mount;
356 vfs_ref(mp);
357 if (mp !=3D ap->a_vp->v_mount) {
358 vfs_rel(mp);
359 mp =3D NULL;
360 }
(kgdb) print ap->a_vp->v_mount
$3 =3D (struct mount *) 0x0
Is there any progress in this area?
--=20
DoubleF
No virus detected in this message. Ehrm, wait a minute...
/kernel: pid 56921 (antivirus), uid 32000: exited on signal 9
Oh yes, no virus:)
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