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

From: Rik van Riel
Date: Fri Feb 07 2014 - 14:40:39 EST

On 02/07/2014 10:19 AM, 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>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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