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From: John Baldwin <jhb@freebsd.org>
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Cc: pluknet <pluknet@gmail.com>
Subject: Re: 8.0RC1: panic: softdep_deallocate_dependencies: unrecovered I/O
	error
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On Thursday 22 October 2009 3:17:38 pm pluknet wrote:
> Hi.
>=20
> I saw this panic just on=D1=81e during system shutdown, which
> runs under VirtualBox. Sorry, I don't remember more details.
>=20
> Unread portion of the kernel message buffer:
> ad0: FAILURE - device detached
> g_vfs_done():ad0s1e[WRITE(offset=3D7380582400, length=3D131072)]error =3D=
 6
> /usr: got error 6 while accessing filesystem
> panic: softdep_deallocate_dependencies: unrecovered I/O error

Generally speaking UFS does not cope well with disk I/O errors and disks
going away (note that ad0 failed and detached before your panic).

=2D-=20
John Baldwin