mm: fix madivse_pageout mishandling on non-LRU page
authorMinchan Kim <minchan@kernel.org>
Thu, 8 Sep 2022 15:12:04 +0000 (08:12 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 5 Oct 2022 08:39:39 +0000 (10:39 +0200)
commitf9aed3d8a0298a5391a1d6611a753c98d221f599
tree3459e89d6b495806b050a8f44a022f86f26158b1
parent1299c11988783d84fff70d6b8a2279ca2d070c8b
mm: fix madivse_pageout mishandling on non-LRU page

commit 58d426a7ba92870d489686dfdb9d06b66815a2ab upstream.

MADV_PAGEOUT tries to isolate non-LRU pages and gets a warning from
isolate_lru_page below.

Fix it by checking PageLRU in advance.

------------[ cut here ]------------
trying to isolate tail page
WARNING: CPU: 0 PID: 6175 at mm/folio-compat.c:158 isolate_lru_page+0x130/0x140
Modules linked in:
CPU: 0 PID: 6175 Comm: syz-executor.0 Not tainted 5.18.12 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:isolate_lru_page+0x130/0x140

Link: https://lore.kernel.org/linux-mm/485f8c33.2471b.182d5726afb.Coremail.hantianshuo@iie.ac.cn/
Link: https://lkml.kernel.org/r/20220908151204.762596-1-minchan@kernel.org
Fixes: 1a4e58cce84e ("mm: introduce MADV_PAGEOUT")
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reported-by: 韩天ç`\95 <hantianshuo@iie.ac.cn>
Suggested-by: Yang Shi <shy828301@gmail.com>
Acked-by: Yang Shi <shy828301@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mm/madvise.c