netdev - Re: igmp broadcast storm Red Hat EL7 3.1 Kernel

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Date:	Mon, 31 Aug 2015 12:10:28 -0600
From:	Jeffrey Merkey <jeffmerkey@...il.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: igmp broadcast storm Red Hat EL7 3.1 Kernel

I was able to reproduce it last night with 2.6.32 on Centos 6.3 so it
does not seem confined to just the 3.X tree.  I think this is
something that's been lurking in the kernel for years and just has a
hard time showing up.   Bugs that go away on their own come back on
their own.

I got a trace of the traffic but need one of the os.  I'll attempt to
get a trace of this again since I seem to be able to reproduce it by
routing NetFlix traffic through the router while I am streaming live
videos on Linux.

I will setup the system to trap the bug and post the traces.

Jeff

On 8/31/15, Cong Wang <xiyou.wangcong@...il.com> wrote:
> (Cc'ing netdev)
>
> On Sat, Aug 29, 2015 at 3:50 PM, Jeffrey Merkey <jeffmerkey@...il.com>
> wrote:
>> When installing Centos 7 running kernel 3.1 (Centos 7 distro) the
>> system generates an igmp broadcast storm which locks up and knocks
>> down a Century Link DSL router.  Powering the router off clears the
>> broadcast storm.
>>
>> The bug is kernel related and resembles very closely another bug seen
>> about 10 years ago with Caldera's distro's on 2.4.  The bug occurs on
>> the ia32 beta build.  The bug DOES NOT exist in the 64 bit x86_64
>> versions.    I will attempt to debug it further since I have my own
>> debugger and try to run it down and provide more info.
>>
>
> A reproducer and/or bisect would help a lot.
>
> Thanks.
>
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