Re: [REGRESSION] Warning in tcp_fastretrans_alert() of net/ipv4/tcp_input.c

Can you try this patch to verify my theory with tcp_recovery=0 and 1? thanks

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 5af2f04f8859..9253d9ee7d0e 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c

@@ -2381,6 +2381,7 @@ static void tcp_undo_cwnd_reduction(struct sock

*sk, bool unmark_loss)
        }
        tp->snd_cwnd_stamp = tcp_time_stamp;
        tp->undo_marker = 0;
+       WARN_ON(tp->retrans_out);
 }