Re: [PATCH] mm: fix page leak at nfs_symlink()

[Mel Gorman]

On Fri, Feb 07, 2014 at 01:19:54PM -0200, Rafael Aquini wrote:
> Changes committed by "a0b8cab3 mm: remove lru parameter from
> __pagevec_lru_add and remove parts of pagevec API" have introduced
> a call to add_to_page_cache_lru() which causes a leak in nfs_symlink() 
> as now the page gets an extra refcount that is not dropped.
> 
> Jan Stancek observed and reported the leak effect while running test8 from
> Connectathon Testsuite. After several iterations over the test case,
> which creates several symlinks on a NFS mountpoint, the test system was
> quickly getting into an out-of-memory scenario.
> 
> This patch fixes the page leak by dropping that extra refcount 
> add_to_page_cache_lru() is grabbing. 
> 
> Signed-off-by: Jan Stancek <jstancek@xxxxxxxxxx>
> Signed-off-by: Rafael Aquini <aquini@xxxxxxxxxx>

Thanks.

Acked-by: Mel Gorman <mgorman@xxxxxxx>

It should be cc'd for stable for 3.11 and later kernels.

-- 
Mel Gorman
SUSE Labs
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