From: Minchan Kim <minchan@xxxxxxxxxx> commit 58d426a7ba92870d489686dfdb9d06b66815a2ab upstream. 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: 韩天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> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/madvise.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/mm/madvise.c +++ b/mm/madvise.c @@ -434,8 +434,11 @@ 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);
