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Re: -mm: xfs lockdep warning

To: Torsten Kaiser <just.for.lkml@xxxxxxxxxxxxxx>
Subject: Re: -mm: xfs lockdep warning
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 5 Oct 2010 14:17:29 -0400
Cc: Tejun Heo <tj@xxxxxxxxxx>, Yang Ruirui <ruirui.r.yang@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Alex Elder <aelder@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <AANLkTikzvD6B=8bGp6h2+bjV5BimErqLOgt2Ujsn053C@xxxxxxxxxxxxxx>
References: <201009161546.16909.ruirui.r.yang@xxxxxxxxx> <20100917005227.GJ24409@dastard> <20100920191355.GA28443@xxxxxxxxxxxxx> <AANLkTi=45J+=ytj=NC4bYTVJFRakNQQiFd35K7mrf+Gq@xxxxxxxxxxxxxx> <4CA997DF.5030008@xxxxxxxxxx> <20101004092107.GJ4681@dastard> <AANLkTi=3jjoCtYoK0endt8OM=omygO284WN2ZQZ=jceo@xxxxxxxxxxxxxx> <4CAB5779.5020901@xxxxxxxxxx> <4CAB5874.9060106@xxxxxxxxxx> <AANLkTikzvD6B=8bGp6h2+bjV5BimErqLOgt2Ujsn053C@xxxxxxxxxxxxxx>
Sender: Christoph Hellwig <hch@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-08-17)
On Tue, Oct 05, 2010 at 08:09:58PM +0200, Torsten Kaiser wrote:
> Here is the complete log from bootup until the hang happened the second time.
> I just logged into KDE and then started the upgrade of KOffice, which
> meant that the package manager started to compile 4 programs each with
> -j5. After a few minutes the load got to ~18 and probably at the point
> where filecache and GCCs filled up my 4GB RAM the system got stuck.
> The mouse so longer moved and SysRq+S did not work. The log was
> captured via serial console on a second system.
> 
> I will try tomorrow with frame pointers enabled..

Lots of hangs in sync_page and dm-crypt in the stack is unfortunately
something we've seen quite a few times, and it usually points to that
layer.  In the best case we might just have a similar workqueue priority
issue somewhere in the dm-crypt or maybe just md code. 

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