--- a/fs/notify/dnotify/dnotify.c	2022-10-29 11:33:20.738540400 +0800
+++ b/fs/notify/dnotify/dnotify.c	2022-10-29 13:44:44.968617800 +0800
@@ -138,9 +138,21 @@ static void dnotify_free_mark(struct fsn
 	kmem_cache_free(dnotify_mark_cache, dn_mark);
 }
 
+static int dnotify_check_mark(struct fsnotify_mark *fsn_mark)
+{
+	struct dnotify_mark *dn_mark = container_of(fsn_mark,
+						    struct dnotify_mark,
+						    fsn_mark);
+	if (dn_mark->dn)
+		return 1;
+	else
+		return 0;
+}
+
 static const struct fsnotify_ops dnotify_fsnotify_ops = {
 	.handle_inode_event = dnotify_handle_event,
 	.free_mark = dnotify_free_mark,
+	.check_mark = dnotify_check_mark,
 };
 
 /*
--- a/fs/notify/mark.c	2022-10-29 11:32:48.394489200 +0800
+++ b/fs/notify/mark.c	2022-10-29 13:39:52.986357800 +0800
@@ -331,6 +331,9 @@ void fsnotify_put_mark(struct fsnotify_m
 		spin_unlock(&destroy_lock);
 		queue_work(system_unbound_wq, &connector_reaper_work);
 	}
+
+	if (mark->group->ops->check_mark)
+		WARN_ON_ONCE(mark->group->ops->check_mark(mark));
 	/*
 	 * Note that we didn't update flags telling whether inode cares about
 	 * what's happening with children. We update these flags from
--- a/include/linux/fsnotify_backend.h	2022-10-29 13:35:58.637169500 +0800
+++ b/include/linux/fsnotify_backend.h	2022-10-29 13:37:12.518647400 +0800
@@ -165,6 +165,7 @@ struct fsnotify_ops {
 	void (*free_event)(struct fsnotify_group *group, struct fsnotify_event *event);
 	/* called on final put+free to free memory */
 	void (*free_mark)(struct fsnotify_mark *mark);
+	int (*check_mark)(struct fsnotify_mark *mark);
 };
 
 /*