netdev - Re: divide error: 0000, in bictcp_cong

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Message-ID: <4E5FEB6B.2040204@techboom.com>
Date:	Thu, 01 Sep 2011 16:30:35 -0400
From:	TB <lkml@...hboom.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	netdev@...r.kernel.org
Subject: Re: divide error: 0000, in bictcp_cong_avoid, kernel 2.6.39

On 11-07-05 03:46 PM, TB wrote:
> On 11-07-05 01:16 PM, Stephen Hemminger wrote:
>> On Mon, 04 Jul 2011 14:10:16 -0400
>> TB <lkml@...hboom.com> wrote:
>>
>>> On 11-07-04 01:36 PM, Stephen Hemminger wrote:
>>>> Any data about the type of connection, kernel configuration or other
>>>> information that might be useful in reproducing the problem?
>>>>
>>>> Also please try 2.6.39.2
>>>
>>> We haven't found a sure way of reproducing it.
>>> It happened on 1.2% of our servers over the weekend and seems random.
>>> Both are connected with 2 gigabit ports using bonding. Traffic tends to
>>> be heavy, but doesn't seem to be a factor.
>>>
>>> Would a .config help ?
>>>
>>> Only the very basic filter module for iptables is compiled in.
>>>
>>> We will try 2.6.39.2 soon
>>
>> Kernel config (and compiler version) would help in identifying which
>> of the three divides is getting divide by zero.
> 
> # gcc --version
> gcc (Debian 4.3.2-1.1) 4.3.2
> 
> 
> # as --version
> GNU assembler (GNU Binutils for Debian) 2.18.0.20080103
> This assembler was configured for a target of `x86_64-linux-gnu'.

We have tried 3.0.4 and the bug is still present, however we have still
been unable to get a proper backtrace. It seems a lot of times the
netlog isn't working.
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