diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index e03a342c9162..e7399816c3c7 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4593,6 +4593,8 @@ void tcp_done(struct sock *sk)
 	 */
 	req = rcu_dereference_protected(tcp_sk(sk)->fastopen_rsk, 1);
 
+	WARN_ON_ONCE(sk->sk_state == TCP_CLOSE);
+
 	if (sk->sk_state == TCP_SYN_SENT || sk->sk_state == TCP_SYN_RECV)
 		TCP_INC_STATS(sock_net(sk), TCP_MIB_ATTEMPTFAILS);
 
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 8e8dcfbc2993..c0832df3b0a3 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -982,7 +982,8 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk,
 		WRITE_ONCE(msk->pm.remote_deny_join_id0, true);
 
 	if (unlikely(!READ_ONCE(msk->pm.server_side)))
-		pr_warn_once("bogus mpc option on established client sk");
+		/* DO-NOT-MERGE: use WARN i/o pr_warn: only for MPTCP export */
+		WARN_ONCE(1, "bogus mpc option on established client sk");
 
 set_fully_established:
 	mptcp_data_lock((struct sock *)msk);