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
Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days
------------------------------------------------------ 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