netdev - Re: [REGRESSION] Warning in tcp_fastretrans_alert() of net/ipv4/tcp

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Message-ID: <40697505.YK5nrFG7Le@natalenko.name>
Date:   Mon, 18 Sep 2017 19:59:54 +0200
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     Yuchung Cheng <ycheng@...gle.com>
Cc:     Neal Cardwell <ncardwell@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: [REGRESSION] Warning in tcp_fastretrans_alert() of net/ipv4/tcp_input.c

OK. Should I keep FACK disabled?

On pondělí 18. září 2017 19:51:21 CEST Yuchung Cheng wrote:
> 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);
>  }