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

From: Oleksandr Natalenko <[email-masked]>
Date: Sun, 10 Jan 2016 16:57:40 +0200

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 <[email-masked]> wrote:
> > On Sun, Jan 10, 2016 at 5:23 AM, Oleksandr Natalenko
> > 
> > <[email-masked]> 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