diff -drupN a/fs/nfs/nfs4idmap.c b/fs/nfs/nfs4idmap.c
--- a/fs/nfs/nfs4idmap.c	2018-08-06 17:23:04.000000000 +0300
+++ b/fs/nfs/nfs4idmap.c	2022-06-12 05:28:14.000000000 +0300
@@ -316,7 +316,7 @@ static ssize_t nfs_idmap_get_key(const c
 	if (ret < 0)
 		goto out_up;
 
-	payload = user_key_payload(rkey);
+	payload = user_key_payload_rcu(rkey);
 	if (IS_ERR_OR_NULL(payload)) {
 		ret = PTR_ERR(payload);
 		goto out_up;