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

From Neal Cardwell <ncardwell@google.com>
Newsgroups linux.kernel
Subject Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero
Date 2016-01-11 19:50 +0100
Message-ID <qPPHs-6ex-3@gated-at.bofh.it> (permalink)
References <qIfpn-2P6-1@gated-at.bofh.it> <qPpDk-5xd-17@gated-at.bofh.it> <qPs8a-7fC-11@gated-at.bofh.it> <qPwbM-1qg-3@gated-at.bofh.it>
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On Sun, Jan 10, 2016 at 4:56 PM, Oleksandr Natalenko
<oleksandr@natalenko.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

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Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2016-01-06 18:00 +0100
  Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible)  division by zero Yuchung Cheng <ycheng@google.com> - 2016-01-06 19:30 +0100
    Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2016-01-06 19:50 +0100
    Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible)  division by zero Yuchung Cheng <ycheng@google.com> - 2016-01-06 19:50 +0100
      Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2016-01-09 18:40 +0100
      Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2016-01-10 11:30 +0100
        Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible)  division by zero Neal Cardwell <ncardwell@google.com> - 2016-01-10 15:50 +0100
          Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible)  division by zero Neal Cardwell <ncardwell@google.com> - 2016-01-10 16:00 +0100
            Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2016-01-10 16:00 +0100
          Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2016-01-10 16:00 +0100
            Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible)  division by zero Neal Cardwell <ncardwell@google.com> - 2016-01-10 18:40 +0100
              Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2016-01-10 19:00 +0100
                Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible)  division by zero Neal Cardwell <ncardwell@google.com> - 2016-01-10 19:10 +0100
              Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2016-01-10 23:00 +0100
                Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible)  division by zero Neal Cardwell <ncardwell@google.com> - 2016-01-11 19:50 +0100
                Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2016-01-12 00:30 +0100

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