Re: [PATCH] mm: bugfix: set current->reclaim_state to NULL whilereturning from kswapd()

[David Rientjes]

On Tue, 6 Nov 2012, Aaditya Kumar wrote:

> From: Takamori Yamaguchi <takamori.yamaguchi@xxxxxxxxxxx>
> 
> In kswapd(), set current->reclaim_state to NULL before returning, as
> current->reclaim_state holds reference to variable on kswapd()'s stack.
> 
> In rare cases, while returning from kswapd() during memory off lining,
> __free_slab() can access dangling pointer of current->reclaim_state.
> 

It's __free_slab() for slub and kmem_freepages() for slab.

> Signed-off-by: Takamori Yamaguchi <takamori.yamaguchi@xxxxxxxxxxx>
> Signed-off-by: Aaditya Kumar <aaditya.kumar@xxxxxxxxxxx>

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
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