--- x/mm/z3fold.c
+++ y/mm/z3fold.c
@@ -1351,8 +1351,11 @@ static void z3fold_page_putback(struct p
 	pool = zhdr_to_pool(zhdr);
 
 	z3fold_page_lock(zhdr);
-	if (!list_empty(&zhdr->buddy))
+	if (!list_empty(&zhdr->buddy)) {
+		spin_lock(&pool->lock);
 		list_del_init(&zhdr->buddy);
+		spin_unlock(&pool->lock);
+	}
 	INIT_LIST_HEAD(&page->lru);
 	if (put_z3fold_locked(zhdr))
 		return;