The patch titled Subject: mm: fix madivse_pageout mishandling on non-LRU page has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-fix-madivse_pageout-mishandling-on-non-lru-page.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Minchan Kim minchan@kernel.org Subject: mm: fix madivse_pageout mishandling on non-LRU page Date: Thu, 8 Sep 2022 08:12:04 -0700

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.hantian... 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: �������`� 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 ---

mm/madvise.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/mm/madvise.c~mm-fix-madivse_pageout-mishandling-on-non-lru-page +++ a/mm/madvise.c @@ -451,8 +451,11 @@ regular_page: continue; }

- /* Do not interfere with other mappings of this page */ - if (page_mapcount(page) != 1) + /* + * Do not interfere with other mappings of this page and + * non-LRU page. + */ + if (!PageLRU(page) || page_mapcount(page) != 1) continue;

VM_BUG_ON_PAGE(PageTransCompound(page), page); _

Patches currently in -mm which might be from minchan@kernel.org are

mm-fix-madivse_pageout-mishandling-on-non-lru-page.patch