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Re: Kernel panic, SB validate failed

To: gbakos@xxxxxxxxxxxxxxx
Subject: Re: Kernel panic, SB validate failed
From: Steve Lord <stephen.lord@xxxxxxxx>
Date: Thu, 04 Dec 2003 11:47:27 -0600
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <3FCF7131.9080703@xxxxxxxx>
References: <Pine.SOL.4.58.0312041209470.18049@xxxxxxxx> <3FCF7131.9080703@xxxxxxxx>
Sender: linux-xfs-bounce@xxxxxxxxxxx
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Sending this again, from a real email address....

Steve Lord wrote:

Gaspar Bakos wrote:

Hi,

Just a couple of debug notes in reference to my previous email. These are
the typical messages I get when xfs_checking the partitions on the disk
(booted in a previous xfs linux from another disk):

Something very wierd has happened to your device, all the magic numbers it
is complaining about are almost correct:

0x58665362 is bSfX it is supposed to be BSFX

0x496e is nI, it is supposed to be NI

So it almost looks like your device got case flipped on every other byte. However if you look at the correct values vs the wrong ones, what is actually happening is that a bit is getting pulled high in every 16 bit quantity. This caused B to become
b, F to become f and N to turn into n.

I would blame hardware here - possibly a cable is out of spec, or has come
loose, I cannot see software ever causing this type of corruption.

Having said that, your disk may still be bad, because you may have had
bad data written onto it.

Steve



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