Re: [PATCH] memory hotplug: fix invalid memory access caused bystale kswapd pointer

[Mel Gorman]

On Thu, Jun 14, 2012 at 11:44:51AM +0800, 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@xxxxxxxxxx>
> Signed-off-by: Jiang Liu <liuj97@xxxxxxxxx>
> 

Acked-by: Mel Gorman <mgorman@xxxxxxx>

-- 
Mel Gorman
SUSE Labs
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