linux-kernel - Re: [PATCH] [4/4] SLAB: Fix node add timer race in cache

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Date:	Mon, 15 Feb 2010 11:32:50 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andi Kleen <andi@...stfloor.org>, penberg@...helsinki.fi,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	haicheng.li@...el.com, rientjes@...gle.com
Subject: Re: [PATCH] [4/4] SLAB: Fix node add timer race in cache_reap

On Mon, Feb 15, 2010 at 05:15:35PM +1100, Nick Piggin wrote:
> On Thu, Feb 11, 2010 at 09:54:04PM +0100, Andi Kleen wrote:
> > 
> > cache_reap can run before the node is set up and then reference a NULL 
> > l3 list. Check for this explicitely and just continue. The node
> > will be eventually set up.
> 
> How, may I ask? cpuup_prepare in the hotplug notifier should always
> run before start_cpu_timer.

I'm not fully sure, but I have the oops to prove it :)

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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