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Date: Wed, 26 Sep 2012 09:25:36 +0200
From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
To: Andrey Chernov <ache@freebsd.org>, "Kenneth D. Merry" <ken@FreeBSD.ORG>,
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Subject: Re: svn commit: r240822 - head/sys/geom
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On Wed, Sep 26, 2012 at 10:34:07AM +0400, Andrey Chernov wrote:
> On Tue, Sep 25, 2012 at 05:37:12PM -0600, Kenneth D. Merry wrote:
> > >   Use the topology lock to protect list of providers while withering =
them.
> > >   It is possible that provider is destroyed while we are iterating ov=
er the
> > >   list.
> >=20
> > This breaks devices going away in CAM.
> >=20
> > When the da(4) driver calls disk_gone(), it is necessarily holding the =
SIM
> > lock, which is a regular MTX_DEF mutex.  The GEOM topology lock is an sx
> > lock, and of WITNESS blows up because of that:
>=20
> I don't know is it related, but in recent -current I got stable panic at=
=20
> the very last stage of reboot (after buffers syncing):
> reboot after panic: mutex Giant owned at ../../../geom/geom_disk.c:638
> using just plain AHCI disks perhaps attached to CAM.

Yes, that looks very related. Stay tuned.

--=20
Pawel Jakub Dawidek                       http://www.wheelsystems.com
FreeBSD committer                         http://www.FreeBSD.org
Am I Evil? Yes, I Am!                     http://tupytaj.pl

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