linux-kernel - Re: kernel BUG in __xfs_get_blocks at fs/xfs/linux-2.6/xfs

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Message-ID: <20060831081726.GV5737019@melbourne.sgi.com>
Date:	Thu, 31 Aug 2006 18:17:26 +1000
From:	David Chinner <dgc@....com>
To:	Yao Fei Zhu <walkinair@...ibm.com>
Cc:	David Chinner <dgc@....com>, linux-kernel@...r.kernel.org,
	haveblue@...ibm.com, xfs@....sgi.com
Subject: Re: kernel BUG in __xfs_get_blocks at fs/xfs/linux-2.6/xfs_aops.c:1293!

On Thu, Aug 31, 2006 at 04:02:36PM +0800, Yao Fei Zhu wrote:
> David Chinner wrote:
> >Hmmmm. We've mapped a range that has been reserved for a delayed
> >allocate extent during a direct I/O. That should not happen as XFS
> >flushes delalloc extents before executing a direct read and holds
> >the I/O lock which will prevent any new writes from mapping new
> >delalloc extents. Something went astray, though. :(
> >
> >Can you give me some more detail on the machine you're running?
> >e.g. How many CPUs, RAM and what type of disk subsystem you are using?
> >That will make it easier for us to try to reproduce this problem.
>
> The test box is an IBM System p5 Linux partition, allocated with
> 0.8 physical POWER5+ cpu processing unit/ 2 virtual processors and 8GB 
> memory.
> The disk is exported by AIX Virtual IO Server.

Nothing too unusual there.

> BTW, I have CONFIG_PPC_64K_PAGES enabled.

But that might be a good place to start. Can you see if you can
reproduce the problem without this config option set?

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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