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

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Message-ID: <CADVnQy=S62KoQL7thY73Kb=1Qd60drvOHJhE8UwH9qzPFOadEg@mail.gmail.com>
Date:	Sun, 10 Jan 2016 09:48:20 -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 5:23 AM, Oleksandr Natalenko
<oleksandr@...alenko.name> wrote:
> With the patch queued for upstream and ECN enabled I get WARN_ON_ONCE()
> triggered. Here is the stacktrace:
>
> https://gist.github.com/89203e77bfcb051f269a
>
> It seems that tp->prior_cwnd is zero.

Hmm. Interesting. Can you please confirm that you are using the cubic
congestion control module?

thanks,
neal