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Re: xfs bug in 2.6.26-rc9

To: Mikael Abrahamsson <swmike@xxxxxxxxx>
Subject: Re: xfs bug in 2.6.26-rc9
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Mon, 14 Jul 2008 17:30:35 +1000
Cc: linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <alpine.DEB.1.10.0807111215040.30192@xxxxxxxxxxxxxxxx>
Mail-followup-to: Mikael Abrahamsson <swmike@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
References: <alpine.DEB.1.10.0807110939520.30192@xxxxxxxxxxxxxxxx> <20080711084248.GU29319@disturbed> <alpine.DEB.1.10.0807111215040.30192@xxxxxxxxxxxxxxxx>
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On Fri, Jul 11, 2008 at 12:21:56PM +0200, Mikael Abrahamsson wrote:
> On Fri, 11 Jul 2008, Dave Chinner wrote:
>
>> That aside, what was the assert failure reported prior to the oops? 
>> i.e. paste the lines in the log before the ---[ cut here ]--- line? One 
>> of them will start with 'Assertion failed:', I think....
>
> These ones?
>
> Jul  8 04:44:56 via kernel: [554197.888008] Assertion failed: whichfork == 
> XFS_ATTR_FORK || ip->i_delayed_blks == 0, file: fs/xfs/xfs_bmap.c, line: 5879
> Jul  9 03:25:21 via kernel: [42940.748007] Assertion failed: whichfork == 
> XFS_ATTR_FORK || ip->i_delayed_blks == 0, file: fs/xfs/xfs_bmap.c, line: 5879

That implies a flush to disk failed to write everything, but no error was
reported back to the flush. Not particularly conclusive what caused
your problem.

That being said, it's not a fatal error - it simply means that
the bmap will return a bogus block number reported for the delalloc
extent that still exists. 

This implies an in-memory error, not an on-disk error...

> I should also say that this assert failue happened two nights in a row so 
> I guess it's fairly reproducible (didn't happen on the 10th, and today,  
> the 11th it seems to have panic:ed around 03:30 (I start the  
> defragmentation via cron at 03:00) which I think is related.

Can you find the file it is failing on and run 'xfs_bmap -vvp
<file>' to just extract the extent map outside the context of
xfs_fsr?

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx


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