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Date: Fri, 22 Jan 2010 18:50:21 -0500
From: Michael Breuer <mbreuer@majjas.com>
Subject: Re: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at
 lib/dma-debug.c:902 check_sync)
In-reply-to: <20100122234656.GC3105@del.dom.local>
To: Jarek Poplawski <jarkao2@gmail.com>
Cc: David Miller <davem@davemloft.net>,
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On 1/22/2010 6:46 PM, Jarek Poplawski wrote:
> On Fri, Jan 22, 2010 at 06:25:12PM -0500, Michael Breuer wrote:
>    
>
> You wrote earlier:
>    
>> [...] Also, there is always a dhcp exchange of some sort
>> preceding the event.
>>      
> So, I'm not sure there was "3) Normal DHCP traffic." if the switch
> could drop DHCP packets in some buggy conditions. Anyway, let's try
> the new one with really "3) Normal DHCP traffic.", I hope.
>
> Jarek P.
>    
When the packets were dropped, there was a different sequence in the log 
- DISCOVER/OFFER repeated. The "normal" is that the sequence appeared 
correct and complete - DISCOVER/OFFER/REQUEST/ACK - or INFORM/ACK (vs. 
INFORM repeatedly sans ACK) as the case may be.