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

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Message-ID: <bb3221cc4b051b0f63bcec2e7489bb8e@natalenko.name>
Date:   Fri, 10 Nov 2017 14:15:01 +0100
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     Yuchung Cheng <ycheng@...gle.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Roman Gushchin <guro@...com>, netdev <netdev@...r.kernel.org>,
        Neal Cardwell <ncardwell@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Lawrence Brakmo <brakmo@...com>
Subject: Re: [REGRESSION] Warning in tcp_fastretrans_alert() of
 net/ipv4/tcp_input.c

Hi.

I'm running the machine with this patch applied for 7 hours now, and the 
warning hasn't appeared yet. Typically, it should be there within the 
first hour.

I'll keep an eye on it for a longer time, but as of now it looks good.

Some explanation on this please?

Thanks!

06.11.2017 23:27, Yuchung Cheng wrote:
...snip...
> hi guys can you try if the warning goes away w/ this quick fix?
> 
> 
> diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
> index 0ada8bfc2ebd..072aab2a8226 100644
> --- a/net/ipv4/tcp_input.c
> +++ b/net/ipv4/tcp_input.c
> @@ -2626,7 +2626,7 @@ void tcp_simple_retransmit(struct sock *sk)
> 
>         tcp_clear_retrans_hints_partial(tp);
> 
> -       if (prior_lost == tp->lost_out)
> +       if (!tp->lost_out)
>                 return;
> 
>         if (tcp_is_reno(tp))
...snip...