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Message-ID: <4FD9624D.3020600@jp.fujitsu.com>
Date: Thu, 14 Jun 2012 13:02:21 +0900
From: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
MIME-Version: 1.0
Subject: Re: [PATCH] memory hotplug: fix invalid memory access caused by stale
 kswapd pointer
References: <1339645491-5656-1-git-send-email-jiang.liu@huawei.com>
In-Reply-To: <1339645491-5656-1-git-send-email-jiang.liu@huawei.com>
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Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Jiang Liu <jiang.liu@huawei.com>
Cc: Mel Gorman <mgorman@suse.de>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Andrew Morton <akpm@linux-foundation.org>, Minchan Kim <minchan@kernel.org>, Hugh Dickins <hughd@google.com>, Keping Chen <chenkeping@huawei.com>, Tony Luck <tony.luck@intel.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Xishi Qiu <qiuxishi@huawei.com>, Jiang Liu <liuj97@gmail.com>, Yasuaki ISIMATU <isimatu.yasuaki@jp.fujitsu.com>

(2012/06/14 12:44), Jiang Liu wrote:
> Function kswapd_stop() will be called to destroy the kswapd work thread
> when all memory of a NUMA node has been offlined. But kswapd_stop() only
> terminates the work thread without resetting NODE_DATA(nid)->kswapd to NULL.
> The stale pointer will prevent kswapd_run() from creating a new work thread
> when adding memory to the memory-less NUMA node again. Eventually the stale
> pointer may cause invalid memory access.
> 
> Signed-off-by: Xishi Qiu<qiuxishi@huawei.com>
> Signed-off-by: Jiang Liu<liuj97@gmail.com>
> 

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>


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