netdev - Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero

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Message-ID: <CADVnQynzxB7mFyprZnNzUUBNhtaibA+9LRGufDLjSw6QeZou2g@mail.gmail.com>
Date:	Mon, 11 Jan 2016 13:47:08 -0500
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:	Yuchung Cheng <ycheng@...gle.com>, netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	James Morris <jmorris@...ei.org>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible)
 division by zero

On Sun, Jan 10, 2016 at 4:56 PM, Oleksandr Natalenko
<oleksandr@...alenko.name> wrote:
> OK, it seems the assumption about YeAH is correct. Here is stacktrace fired by
> WARN_ON_ONCE():
>
> https://gist.github.com/851cedcfca60d6120035
>
> Is there sufficient info for you to prepare upstream patch?

Great. Thanks for running that test! Yes, I think that's enough info.
We sent a proposed upstream patch here:

  http://patchwork.ozlabs.org/patch/566072/
  tcp_yeah: don't set ssthresh below 2

Feel free to add your "Tested-By" to the thread if you have a chance
to test that patch.

Thanks,
neal