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Date:      Tue, 28 Aug 2007 18:53:31 +0200
From:      Pawel Jakub Dawidek <pjd@FreeBSD.org>
To:        Pascal Hofstee <caelian@gmail.com>
Cc:        current@FreeBSD.org
Subject:   Re: ZFS kernel panic
Message-ID:  <20070828165331.GA39562@garage.freebsd.pl>
In-Reply-To: <1188311242.1052.11.camel@trinity>
References:  <1188311242.1052.11.camel@trinity>

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On Tue, Aug 28, 2007 at 04:27:22PM +0200, Pascal Hofstee wrote:
> Hi,
>=20
> For the last couple of weeks now I've occasionally been getting kernel
> panics through ZFS (usually during heavy disk-i/o on the ZFS volume)
> usually at the time this happened i was busy in X and therefore unable
> to get to the console and force a kernel-dump. Today though it seems i
> was lucky and actually managed to catch a kernel panic while in console
> mode. Below is the actual panic message, i tried looking at the actual
> backtrace but all the interesting frames are purely addresses without
> any symbol information. I'll assume this is because of zfs and friends
> being loaded as KLDs. Any information on how to provide a proper
> backtrace including all symbols involved would be appreciated.
>=20
> uname -a:
> FreeBSD trinity.zion 7.0-CURRENT FreeBSD 7.0-CURRENT #29: Sun Aug 26
> 20:19:12 CEST 2007     pascal@trinity.zion:/usr/obj/usr/src/sys/TRINITY
> i386
>=20
> panic: ZFS: I/O failure (write on <unknown> off 0: zio 0xc66a9cf0 [L0
> ZFS plain file] 20000L/20000P DVA[0]=3D<0:a126e0000:20000> fletcher2
> uncompressed LE contiguous birth=3D7004722 fill=3D1
> cksum=3D2dc0c354bd8ccc27:85745b74c1352a7f:72188a8646f7f624:28d89f21264ed4=
f2): e^

When you don't use redundant configuration (no mirror, no raidz, no
copies>1) then ZFS is going to panic on a write failure. It looks like
ZFS found a bad block on your disk.

--=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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