This is a note to let you know that I've just added the patch titled
mm: bugfix: set current->reclaim_state to NULL while returning from kswapd()
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-bugfix-set-current-reclaim_state-to-null-while-returning-from-kswapd.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From b0a8cc58e6b9aaae3045752059e5e6260c0b94bc Mon Sep 17 00:00:00 2001
From: Takamori Yamaguchi <[email protected]>
Date: Thu, 8 Nov 2012 15:53:39 -0800
Subject: mm: bugfix: set current->reclaim_state to NULL while returning from
kswapd()
From: Takamori Yamaguchi <[email protected]>
commit b0a8cc58e6b9aaae3045752059e5e6260c0b94bc upstream.
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 offlining,
__free_slab() and freepages() can access the dangling pointer of
current->reclaim_state.
Signed-off-by: Takamori Yamaguchi <[email protected]>
Signed-off-by: Aaditya Kumar <[email protected]>
Acked-by: David Rientjes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
mm/vmscan.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3128,6 +3128,8 @@ static int kswapd(void *p)
&balanced_classzone_idx);
}
}
+
+ current->reclaim_state = NULL;
return 0;
}
Patches currently in stable-queue which might be from
[email protected] are
queue-3.4/mm-bugfix-set-current-reclaim_state-to-null-while-returning-from-kswapd.patch
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