From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Lameter <cl@linux-foundation.org>
Subject: Re: No, really, stop trying to delete slab until you've finished
 making slub perform as well
Date: Thu, 14 Aug 2008 09:45:16 -0500
Message-ID: <48A444FC.8090908@linux-foundation.org>
References: <20080805210125.A897.KOSAKI.MOTOHIRO@jp.fujitsu.com> <48986AC6.5030406@linux-foundation.org> <20080813194222.E77F.KOSAKI.MOTOHIRO@jp.fujitsu.com> <48A2DD2C.3090602@linux-foundation.org> <48A3DBAC.6010109@cs.helsinki.fi>
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Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	KOSAKI Motohiro <m-kosaki@ceres.dti.ne.jp>,
	Matthew Wilcox <matthew@wil.cx>, akpm@linux-foundation.org,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Mel Gorman <mel@skynet.ie>, andi@firstfloor.org,
	Rik van Riel <riel@redhat.com>
To: Pekka Enberg <penberg@cs.helsinki.fi>
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Pekka Enberg wrote:
> This patch hard locks  on my 2-way 64-bit x86 machine (sysrq doesn't 
> respond) when I run hackbench.
Hmmm.. Then the issue may be different than we thought. Lock may be 
taken recursively in some situations.
Can you enable lockdep?