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/mm-fix-madivse_pageout-mishandling-on-non-lru-page.patch
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@xxxxxxxxxx>
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.hantianshuo@xxxxxxxxx/
Link: https://lkml.kernel.org/r/20220908151204.762596-1-minchan@xxxxxxxxxx
Fixes: 1a4e58cce84e ("mm: introduce MADV_PAGEOUT")
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Reported-by: é?©å¤©ç`? <hantianshuo@xxxxxxxxx>
Suggested-by: Yang Shi <shy828301@xxxxxxxxx>
Acked-by: Yang Shi <shy828301@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx are
mm-fix-madivse_pageout-mishandling-on-non-lru-page.patch
