linux-kernel - [PATCH] mm: fix madivse_pageout mishandling on non-LRU page

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Message-Id: <20220908151204.762596-1-minchan@kernel.org>
Date:   Thu,  8 Sep 2022 08:12:04 -0700
From:   Minchan Kim <minchan@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Yu Zhao <yuzhao@...gle.com>, Minchan Kim <minchan@...nel.org>,
        韩天硕 <hantianshuo@....ac.cn>,
        Yang Shi <shy828301@...il.com>, stable@...r.kernel.org
Subject: [PATCH] mm: fix madivse_pageout mishandling on non-LRU page

MADV_PAGEOUT tries to isolate non-LRU pages and get the warning
from isolate_lru_page below.
Fix it with 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/
Reported-by: 韩天硕 <hantianshuo@....ac.cn>
Suggested-by: Yang Shi <shy828301@...il.com>
Fixes: 1a4e58cce84e ("mm: introduce MADV_PAGEOUT")
Cc: stable@...r.kernel.org
Signed-off-by: Minchan Kim <minchan@...nel.org>
Acked-by: Yang Shi <shy828301@...il.com>
---
 mm/madvise.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index 682e1d161aef..a3fc4cd32ed3 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -452,8 +452,11 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd,
 			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);
-- 
2.37.2.672.g94769d06f0-goog