Re: [PATCH] memory hotplug: fix invalid memory access caused by stalekswapd pointer

[KOSAKI Motohiro]

On Wed, Jun 13, 2012 at 11:44 PM, Jiang Liu <jiang.liu@xxxxxxxxxx> 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@xxxxxxxxxx>
> Signed-off-by: Jiang Liu <liuj97@xxxxxxxxx>

Acked-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
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