linux-kernel - Re: lockdep possible recursive lock in slab parent->list->rlock in rc2

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Date:	Mon, 28 Dec 2009 10:40:03 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	a.p.zijlstra@...llo.nl, cl@...ux-foundation.org
Subject: Re: lockdep possible recursive lock in slab parent->list->rlock in
 rc2

On Sun, Dec 27, 2009 at 02:33:14PM +0200, Pekka Enberg wrote:
> Hi Andi,
> 
> On Sun, 2009-12-27 at 13:06 +0100, Andi Kleen wrote:
> > Get this on a NFS root system while booting
> > This must be a recent change in the last week, 
> > I didn't see it in a post rc1 git* from last week
> > (I haven't done a exact bisect)
> > 
> > It's triggered by the r8169 driver close function, 
> > but looks more like a slab problem?
> > 
> > I haven't checked it in detail if the locks are 
> > really different or just lockdep not knowing 
> > enough classes.
> 
> I broke the lockdep annotations in commit
> ce79ddc8e2376a9a93c7d42daf89bfcbb9187e62 ("SLAB: Fix lockdep annotations
> for CPU hotplug"). Does this fix things for you? Heiko, the following
> patch should fix it for you too.

Works fine here too. Thanks!
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