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Re: latest -git: kernel BUG at fs/xfs/support/debug.c:54!

To: Vegard Nossum <vegard.nossum@xxxxxxxxx>
Subject: Re: latest -git: kernel BUG at fs/xfs/support/debug.c:54!
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 18 Jul 2008 08:40:12 +1000
Cc: Eric Sandeen <sandeen@xxxxxxxxxx>, Tim Shimmin <xfs-masters@xxxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Johannes Weiner <hannes@xxxxxxxxxxxx>
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On Thu, Jul 17, 2008 at 09:29:39PM +0200, Vegard Nossum wrote:
> On Thu, Jul 17, 2008 at 9:18 PM, Vegard Nossum <vegard.nossum@xxxxxxxxx> 
> wrote:
> > Thanks, you are right. I have adjusted my configuration, but I am
> > still able to produce this:
> >
> > BUG: unable to handle kernel paging request at b62a66e0
> > IP: [<c030ef88>] xfs_alloc_fix_freelist+0x28/0x490
> 
> FWIW, this is fs/xfs/xfs_alloc.c:1817:
> 
>         if (!pag->pagf_init) {

Which kind of implies that we've got a bogus fsbno
that we're using as the basis of allocation.....

What is the corruption you are inducing? Can you produce
a xfs_metadump image of the filesystem and put it up somewhere
that we can access it?

I suspect that we are not validating the block numbers coming
out of the various btrees as landing inside the filesystem....

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx


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