2.6.32-longterm review patch. If anyone has any objections, please let me know.
------------------ 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]> Signed-off-by: Willy Tarreau <[email protected]> --- mm/vmscan.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 4649929..738db2b 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2241,6 +2241,8 @@ static int kswapd(void *p) balance_pgdat(pgdat, order); } } + + current->reclaim_state = NULL; return 0; } -- 1.7.12.2.21.g234cd45.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
