--- x/net/kcm/kcmsock.c
+++ y/net/kcm/kcmsock.c
@@ -1714,7 +1714,7 @@ static int kcm_release(struct socket *so
 	/* Cancel work. After this point there should be no outside references
 	 * to the kcm socket.
 	 */
-	cancel_work_sync(&kcm->tx_work);
+	flush_work(&kcm->tx_work);
 
 	lock_sock(sk);
 	psock = kcm->tx_psock;