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

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Message-ID: <4496498.SgxPQx9et6@spock>
Date:	Sun, 10 Jan 2016 16:57:40 +0200
From:	Oleksandr Natalenko <oleksandr@...alenko.name>
To:	Neal Cardwell <ncardwell@...gle.com>
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

Yes, this is my next step. Then I'll try to move from YeAH.

On неділя, 10 січня 2016 р. 09:54:16 EET Neal Cardwell wrote:
> On Sun, Jan 10, 2016 at 9:48 AM, Neal Cardwell <ncardwell@...gle.com> wrote:
> > 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?
> 
> Would you be able to do an experiment where you reboot, and then
> disable ECN upon startup, and then see if the warning still shows up
> without ECN?
> 
> thanks,
> neal