It is possible that folio2 no longer belongs to the original mapping. Signed-off-by: Zi Yan <ziy@xxxxxxxxxx> --- mm/truncate.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/mm/truncate.c b/mm/truncate.c index 031d0be19f42..0790b6227512 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -244,8 +244,14 @@ bool truncate_inode_partial_folio(struct folio *folio, loff_t start, loff_t end) if (!folio_trylock(folio2)) goto out; - /* split result does not matter here */ - try_folio_split(folio2, split_at2, NULL); + /* + * make sure folio2 is large and does not change its mapping. + * Its split result does not matter here. + */ + if (folio_test_large(folio2) && + folio2->mapping == folio->mapping) + try_folio_split(folio2, split_at2, NULL); + folio_unlock(folio2); out: folio_put(folio2); -- 2.47.2 -- Best Regards, Yan, Zi
