linux-kernel - Re: Kernel crash in xfs_iflush_cluster (was Somebody take a look please!...)

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Date:	Fri, 16 Apr 2010 10:01:10 +0200
From:	"Janos Haar" <janos.haar@...center.hu>
To:	"Dave Chinner" <david@...morbit.com>
Cc:	<xiyou.wangcong@...il.com>, <linux-kernel@...r.kernel.org>,
	<kamezawa.hiroyu@...fujitsu.com>, <linux-mm@...ck.org>,
	<xfs@....sgi.com>, <axboe@...nel.dk>
Subject: Re: Kernel crash in xfs_iflush_cluster (was Somebody take a look please!...)


----- Original Message ----- 
From: "Dave Chinner" <david@...morbit.com>
To: "Janos Haar" <janos.haar@...center.hu>
Cc: <xiyou.wangcong@...il.com>; <linux-kernel@...r.kernel.org>; 
<kamezawa.hiroyu@...fujitsu.com>; <linux-mm@...ck.org>; <xfs@....sgi.com>; 
<axboe@...nel.dk>
Sent: Thursday, April 15, 2010 11:23 AM
Subject: Re: Kernel crash in xfs_iflush_cluster (was Somebody take a look 
please!...)


> On Thu, Apr 15, 2010 at 09:00:49AM +0200, Janos Haar wrote:
>> Dave,
>>
>> The corruption + crash reproduced. (unfortunately)
>>
>> http://download.netcenter.hu/bughunt/20100413/messages-15
>>
>> Apr 14 01:06:33 alfa kernel: XFS mounting filesystem sdb2
>>
>> This was the point of the xfs_repair more times.
>
> OK, the inodes that are corrupted are different, so there's still
> something funky going on here. I still would suggest replacing the
> RAID controller to rule that out as the cause.

News:

(reminder from the actual state:
xfs_repair fixed the fs, than kernel reported again the corruption and 
crashed, i wrote the provious letter to report this.)

Yesterday i have stopped the service, and run xfs_repair (new version only) 
on 2 FS, but it was clean!
(this shows me, the reported corruption was only in memory, or the kernel 
repaired it on the reboot.)
(The XFS_Debug turned on before.)
Today morning i have another messages in the syslog from the sdb2 again.
At this point, i don't know what to think.

http://download.netcenter.hu/bughunt/20100413/messages-16

Regards,
Janos


>
> FWIW, do you have any other servers with similar h/w, s/w and
> workloads? If so, are they seeing problems?
>
> Can you recompile the kernel with CONFIG_XFS_DEBUG enabled and
> reboot into it before you repair and remount the filesystem again?
> (i.e. so that we know that we have started with a clean filesystem
> and the debug kernel) I'm hoping that this will catch the corruption
> much sooner, perhaps before it gets to disk. Note that this will
> cause the machine to panic when corruption is detected, and it is
> much,much more careful about checking in memory structures so there
> is a CPU overhead involved as well.
>
> Cheers,
>
> Dave.
> -- 
> Dave Chinner
> david@...morbit.com
> --
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