linux-kernel - Re: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at lib/dma-debug.c:902 check

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Message-id: <4B5A39BD.8020305@majjas.com>
Date:	Fri, 22 Jan 2010 18:50:21 -0500
From:	Michael Breuer <mbreuer@...jas.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	akpm@...ux-foundation.org, flyboy@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Michael Chan <mchan@...adcom.com>,
	Don Fry <pcnet32@...izon.net>,
	Francois Romieu <romieu@...zoreil.com>,
	Matt Carlson <mcarlson@...adcom.com>
Subject: Re: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at
 lib/dma-debug.c:902 check_sync)

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.
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