diff --git a/block/bio.c b/block/bio.c
index 3d3a2678fea2..106ef14f28c2 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -869,6 +869,8 @@ static inline bool page_is_mergeable(const struct bio_vec *bv,
 	*same_page = ((vec_end_addr & PAGE_MASK) == page_addr);
 	if (*same_page)
 		return true;
+	else if (IS_ENABLED(CONFIG_KMSAN))
+		return false;
 	return (bv->bv_page + bv_end / PAGE_SIZE) == (page + off / PAGE_SIZE);
 }