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.hantian... Reported-by: 韩天硕 hantianshuo@iie.ac.cn Suggested-by: Yang Shi shy828301@gmail.com Fixes: 1a4e58cce84e ("mm: introduce MADV_PAGEOUT") Cc: stable@vger.kernel.org Signed-off-by: Minchan Kim minchan@kernel.org Acked-by: Yang Shi shy828301@gmail.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);