netdev - Re: BUG: soft lockup detected on CPU#0! (2.6.18.2 plus hacks)

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Date:	Thu, 04 Jan 2007 09:04:29 -0800
From:	Ben Greear <greearb@...delatech.com>
To:	Jarek Poplawski <jarkao2@...pl>
CC:	Herbert Xu <herbert.xu@...hat.com>,
	David Stevens <dlstevens@...ibm.com>, netdev@...r.kernel.org
Subject: Re: BUG: soft lockup detected on CPU#0!  (2.6.18.2 plus hacks)

Jarek Poplawski wrote:
> On Thu, Jan 04, 2007 at 09:27:07PM +1100, Herbert Xu wrote:
>   
>> On Thu, Jan 04, 2007 at 09:50:14AM +0100, Jarek Poplawski wrote:
>>     
>>> Could you explain? I can see some inet_rtm_newaddr
>>> interrupted. For me it could be e.g.:
>>>
>>> after
>>> vconfig add eth0 9
>>>
>>> ip addr add dev eth0.9 ...
>>>       
>> Whether eth0.9 is up or not does not affect this at all.  The spin
>> locks are initialised (and used) when the first IPv4 address is added,
>> not when the device comes up.
>>     
>
> I understand this. I consider IFF_UP as a sign all 
> initialisations (open functions including) are
> completed and there is permission for working (so
> logically, if I would do eth0.9 down all traffic
> should be stopped, what probably isn't true now).
>   
It is certainly valid for an interface to be IF_UP, but have no IP 
address.  My application
does bring the network device up before it assigns the IP, for instance.

There may be other issues with IF_UP, but that could be handled with a 
different
investigation.  If you have a particular test case that fails with 
802.1Q VLANs, then
I will be happy to work on it...

Thanks,
Ben

> Jarek P. 
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>   


-- 
Ben Greear <greearb@...delatech.com> 
Candela Technologies Inc  http://www.candelatech.com


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