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Date:      Fri, 12 Jan 2007 20:06:55 +0100
From:      Pawel Jakub Dawidek <pjd@FreeBSD.org>
To:        Attila Nagy <bra@fsn.hu>
Cc:        freebsd-hackers@freebsd.org, perryh@pluto.rain.com, Kris Kennaway <kris@obsecurity.org>
Subject:   Re: ufs_rename: fvp == tvp (can't happen), but it did
Message-ID:  <20070112190655.GC90718@garage.freebsd.pl>
In-Reply-To: <45A76480.6010108@fsn.hu>
References:  <45A0229F.7070701@fsn.hu> <45a03a95.08FguubdCa9DFcxj%perryh@pluto.rain.com> <45A0DD27.4020704@fsn.hu> <20070111010149.GA2704@xor.obsecurity.org> <45A76480.6010108@fsn.hu>

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On Fri, Jan 12, 2007 at 11:35:44AM +0100, Attila Nagy wrote:
> On 01/11/07 02:01, Kris Kennaway wrote:
> >On Sun, Jan 07, 2007 at 12:44:39PM +0100, Attila Nagy wrote:
> > =20
> >>On 2007.01.07. 1:11, perryh@pluto.rain.com wrote:
> >>   =20
> >>>It sounds as if the caller of ufs_rename() is confused.  You could
> >>>try setting a breakpoint on the printf(), or change it to a panic()
> >>>to get a dump, and try to figure out who the caller is and what is
> >>>going on.
> >>>      =20
> >>Yes this would be very good, especially if this wouldn't be a productio=
n machine or if I could reproduce this on a test system. But neither of thi=
s are true. :(
> >>
> >>Maybe I will try it on a sleepless night, in the maintenance window, th=
anks for the idea.
> >>   =20
> >
> >Try forcing a fsck, sometimes bizarre FS panics are due to filesystem
> >corruption.
> > =20
> I've already thought of that, but in that case the FC array must be bad, =
since going with only the locally attached disks in the mirror, the error d=
oesn't appear...

Silent data corruptions happens, look for example at the "problem with
4T volume under FreeBSD" thread on current@.

I'd suggest configuring geli with data authentication on top of the FC
array. geli will detect silent data corruptions.

--=20
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd@FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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