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

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Date:   Fri, 10 Nov 2017 14:40:08 +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

Uhh, sorry, just found the original submission [1].

[1] https://marc.info/?l=linux-netdev&m=151009763926816&w=2

10.11.2017 14:15, Oleksandr Natalenko wrote:
> 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...