linux-kernel - Re: 0x7f in SectorIdNotFound errors

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Message-Id: <1156878938.6271.124.camel@localhost.localdomain>
Date:	Tue, 29 Aug 2006 20:15:38 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Martin Dorey <mdorey@...earc.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 0x7f in SectorIdNotFound errors

Ar Llu, 2006-08-28 am 12:56 -0700, ysgrifennodd Martin Dorey:
> Aug 14 01:10:33 ithaki kernel: hdb: drive_cmd: status=0x7f { DriveReady
> DeviceFault SeekComplete DataRequest CorrectedError Index Error }
> 
> In hex, that LBAsect is 0x17f7f7f7f7f.  The disk is:

That may well have been f7f7f7f7f7... because several bits will have
been masked (its not 32bit addressed at controller<>device level)

> FS is ext3.  smartctl didn't report any errors but, then, it wouldn't
> necessarily if the problem was garbage fs metadata.  I found a few other
> LKML postings with 0x7f patterns in part of the LBAsect.

If you force an fsck do you see any errors ? I guess not but if you have
a chance to check please do.

I'm not sure where F7 came from as it is not a poison value we typically
use. The fact the value is odd is also significant. Most of the kernel
deals in 1K block sizes so any error/corruption occurred fairly low down
once we got into sectors. That seems to rule out, for example, ext3
metadata corruption because it would be very strange drive geometry to
start a partition on an odd sector boundary, and the ext3 meta data
doesn't go down to sector granularity.

Alan

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