Date: Thu, 3 Feb 2011 09:18:58 +1100
From: Dave Chinner <david@fromorbit.com>
To: Andy Isaacson <adi@hexapodia.org>
Cc: linux-kernel@vger.kernel.org, xfs@oss.sgi.com
Subject: Re: XFS stat/statvfs problems with 2.6.38-rc2-00175-g6fb1b30
Message-ID: <20110202221858.GS11040@dastard>
References: <20110202023644.GA25214@hexapodia.org>
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On Tue, Feb 01, 2011 at 06:36:44PM -0800, Andy Isaacson wrote:
> Since updating past 2.6.37, I'm seeing du(1) sometimes report files
> taking up 8GB even though ls(1) reports the correct size (hundreds of
> bytes).  At the same time, df reports that the filesystem is 95% or 100%
> full (although I can still write to the filesystem).  Repeated du calls
> show persistent results (once st_blocks is wrong, it stays wrong).
> Rebooting clears the problem for a few hours, then it seems to come
> back, although the exact files affected seems to change.  xfs_check
> doesn't find any errors, and rebooting into 2.6.37 clears up the problem
> entirely.
> 
> There's nothing in dmesg indicating a problem:
> 
> Jan 27 08:04:37 pyron kernel: [    0.000000] Linux version 2.6.38-rc2-00175-g6fb1b30 (adi@pyron) (gcc version 4.4.5 (Debian 4.4.5-10) ) #75 SMP Thu Jan 27 00:39:11 PST 2011
> Jan 27 08:04:37 pyron kernel: [    8.420170] SGI XFS with ACLs, security attributes, large block/inode numbers, no debug enabled
> Jan 27 08:04:37 pyron kernel: [    8.434527] XFS mounting filesystem dm-8
> Jan 27 08:04:37 pyron kernel: [    8.676644] Starting XFS recovery on filesystem: dm-8 (logdev: internal)
> Jan 27 08:04:37 pyron kernel: [    8.734279] Ending XFS recovery on filesystem: dm-8 (logdev: internal)
> Jan 27 08:04:37 pyron kernel: [    8.762724] XFS mounting filesystem dm-9
> Jan 27 08:04:37 pyron kernel: [    8.957986] Ending clean XFS mount for filesystem: dm-9
> Jan 27 08:04:37 pyron kernel: [    8.985909] XFS mounting filesystem dm-10
> Jan 27 08:04:37 pyron kernel: [    9.098404] Starting XFS recovery on filesystem: dm-10 (logdev: internal)
> Jan 27 08:04:37 pyron kernel: [    9.205018] Ending XFS recovery on filesystem: dm-10 (logdev: internal)
> 
> 
> /d1 is a 200GB XFS on DM on AHCI SATA on a Core i7 desktop board.
> The erroneous statvfs reports are visible in this munin graph:
> http://web.hexapodia.org/~adi/tmp/20110201-df-pyron.png
> (the filesystem is actually 72% full currently, and should be linearly
> filling as is visible around Jan 26.)

It'll be the excessive specualtive preallocation bug introduced in
.38-rc1  which is fixed in .38-rc3.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com
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