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From: "Desai, Kashyap" <Kashyap.Desai@lsi.com>
To: "freebsd-scsi@freebsd.org" <freebsd-scsi@freebsd.org>,
	"freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org>
Date: Fri, 6 Apr 2012 15:31:39 +0530
Thread-Topic: Kernel crash at "softdep_deallocate_dependencies"
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Cc: "Kenneth D.Merry" <ken@FreeBSD.org>, "McConnell,
	Stephen" <Stephen.McConnell@lsi.com>
Subject: Kernel crash at "softdep_deallocate_dependencies"
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X-List-Received-Date: Fri, 06 Apr 2012 10:01:48 -0000

Hi, Thanks in advance for looking this query and hoping for some help from =
File system experts.

We have a RAID 0 volume which has partition (created using sysinstall fdisk=
 option).
While IOs are in progress removing one of the volume member kernel panic is=
 hit with the following messages

g_vfs_done():(da0:da0s1d[WRITE(offset=3D6358872064, length=3D2048)]mpslsi0:=
0:error =3D 6
0:/home: got error 6 while accessing filesystem
0): panic: softdep_deallocate_dependencies: unrecovered I/O error
lost device

Note:
1. The issue is also seen on a RAID 0 volume which does not have a partitio=
n on it.
2. Issue was observed on both SAS and SATA drives.
3. When we send IOs to the driver without FS (using "dd" command), kernel p=
anic never seen.


I have searched on this topic and looks like something wrong with FS. _but_=
 I don't have any trigger to support that this is not Driver issue.

When we tried below options: (disable Journal on FS) Things does not change=
. We still see kernel panic.

umount <filesystem>
tunefs -j disable <filesystem>
mount <filesystem>
cd <filesystem>
rm .sujournal


Any thoughts ?

` Kashyap