netdev - Re: net-next: WARNING: CPU: 0 PID: 1544 at net/ipv4/tcp

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Date:   Mon, 16 Oct 2017 18:32:29 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Andrei Vagin <avagin@...il.com>, Yuchung Cheng <ycheng@...gle.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: net-next: WARNING: CPU: 0 PID: 1544 at net/ipv4/tcp_input.c:889

On Mon, Oct 16, 2017 at 4:11 PM, Andrei Vagin <avagin@...il.com> wrote:
> Hi Eric,
>
> Could you take a look at this warning? It may be related with your
> recent patches. First time we saw this warning 7 days ago
> (net-next/master) and now we see it regularly.
>
> I printed tp->fackets_out and state->reord  before the warnings and
> here are values for them:
> tp->fackets_out = -1 state->reord = 4
>
> In my case, this warning is triggered for connections which have been
> restored by CRIU.
>
> Let me know if you need any other information. I can reproduce this
> bugs for an hour.
>
> Thanks,
> Andrei

Hi Andrei

We are aware of these recurring issues and Yuchung and other Googlers
decided it was time to remove FACK.

Stay tuned.