linux-kernel - Re: [PATCH] memory hotplug: fix invalid memory access caused by stale kswapd pointer

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Message-ID: <alpine.DEB.2.00.1206161919580.797@chino.kir.corp.google.com>
Date:	Sat, 16 Jun 2012 19:20:09 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Jiang Liu <jiang.liu@...wei.com>
cc:	Mel Gorman <mgorman@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Keping Chen <chenkeping@...wei.com>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Xishi Qiu <qiuxishi@...wei.com>,
	Jiang Liu <liuj97@...il.com>
Subject: Re: [PATCH] memory hotplug: fix invalid memory access caused by
 stale kswapd pointer

On Thu, 14 Jun 2012, 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@...wei.com>
> Signed-off-by: Jiang Liu <liuj97@...il.com>

Acked-by: David Rientjes <rientjes@...gle.com>
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