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Date:	Mon, 08 Jan 2007 08:57:10 -0800
From:	Ben Greear <greearb@...delatech.com>
To:	Jarek Poplawski <jarkao2@...pl>
CC:	David Miller <davem@...emloft.net>, herbert@...dor.apana.org.au,
	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 Fri, Jan 05, 2007 at 12:33:43PM -0800, Ben Greear wrote:
> ...
>   
>> So, I do believe this was the problem we were hitting, and it seems fixed.
>>     
>
> Congratulations!
>
> But I can see one strange thing in vlan.c:
>
> /* Must be invoked with RCU read lock (no preempt) */
> static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
> ...
>  * Must be invoked with RCU read lock (no preempt)
>  */
> struct net_device *__find_vlan_dev(struct net_device *real_dev,
> ...
>
> But later in this file no sign of disabling preemption
> for these calls and for hlist_add_head_rcu and hlist_del_rcu.
>
> I can't imagine how this works?
>   
Perhaps...I didn't RCU-ify VLANs, but I can take a look.

For the record, the soft lockup was using MAC-VLANs, not 802.1Q VLANs, 
so it wouldn't
have been affected by bugs in VLANs one way or the other.

Ben

> Jarek P. 
>   


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


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