From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oleksandr Natalenko <oleksandr@natalenko.name>
Subject: Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero
Date: Sun, 10 Jan 2016 16:57:00 +0200
Message-ID: <1562805.Wa36G0OKaZ@spock>
References: <26396443.iDTTxgChSj@spock> <8830013.bJO8vnIv9N@spock> <CADVnQy=S62KoQL7thY73Kb=1Qd60drvOHJhE8UwH9qzPFOadEg@mail.gmail.com>
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Cc: Yuchung Cheng <ycheng@google.com>, netdev <netdev@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Patrick McHardy <kaber@trash.net>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	James Morris <jmorris@namei.org>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	"David S. Miller" <davem@davemloft.net>
To: Neal Cardwell <ncardwell@google.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <CADVnQy=S62KoQL7thY73Kb=1Qd60drvOHJhE8UwH9qzPFOadEg@mail.gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

I use YeAH. But YeAH code wasn't touched between 4.2 and 4.3.

On =D0=BD=D0=B5=D0=B4=D1=96=D0=BB=D1=8F, 10 =D1=81=D1=96=D1=87=D0=BD=D1=
=8F 2016 =D1=80. 09:48:20 EET Neal Cardwell wrote:
> On Sun, Jan 10, 2016 at 5:23 AM, Oleksandr Natalenko
>=20
> <oleksandr@natalenko.name> wrote:
> > With the patch queued for upstream and ECN enabled I get WARN_ON_ON=
CE()
> > triggered. Here is the stacktrace:
> >=20
> > https://gist.github.com/89203e77bfcb051f269a
> >=20
> > It seems that tp->prior_cwnd is zero.
>=20
> Hmm. Interesting. Can you please confirm that you are using the cubic
> congestion control module?
>=20
> thanks,
> neal