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| author | Minchan Kim <minchan@kernel.org> | 2022-09-08 08:12:04 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-26 12:14:33 -0700 |
| commit | 58d426a7ba92870d489686dfdb9d06b66815a2ab (patch) | |
| tree | d0be23f5a797e2f42856dcde0ff12062aea9d5f9 /mm/madvise.c | |
| parent | bedf03416913d88c796288f9dca109a53608c745 (diff) | |
| download | lwn-58d426a7ba92870d489686dfdb9d06b66815a2ab.tar.gz lwn-58d426a7ba92870d489686dfdb9d06b66815a2ab.zip | |
mm: fix madivse_pageout mishandling on non-LRU page
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` <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>
Diffstat (limited to 'mm/madvise.c')
| -rw-r--r-- | mm/madvise.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/madvise.c b/mm/madvise.c index 5f0f0948a50e..9ff51650f4f0 100644 --- a/mm/madvise.c +++ b/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); |