netdev - Re: [PATCH] ipvs: fix dst_lock locking on dest update

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Date:	Wed, 23 Feb 2011 09:26:24 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Julian Anastasov <ja@....bg>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org
Subject: Re: [PATCH] ipvs: fix dst_lock locking on dest update

On Tue, Feb 22, 2011 at 10:40:25AM +0200, Julian Anastasov wrote:
> 
> 	Fix dst_lock usage in __ip_vs_update_dest. We need
> _bh locking because destination is updated in user context.
> Can cause lockups on frequent destination updates.
> Problem reported by Simon Kirby. Bug was introduced
> in 2.6.37 from the "ipvs: changes for local real server"
> change.
> 
> Signed-off-by: Julian Anastasov <ja@....bg>

Acked-by: Simon Horman <horms@...ge.net.au>

> ---
> 
> 	Dave, please apply to net-2.6.
> Patch is for 2.6.37+ and applies to 2.6.38-rc6. There is
> little fuzz when applying to net-next, let me know if
> I should provide patch for other trees.
> 
> --- linux-2.6.37/net/netfilter/ipvs/ip_vs_ctl.c	2011-01-06 00:01:23.600069161 +0200
> +++ linux/net/netfilter/ipvs/ip_vs_ctl.c	2011-02-19 23:14:44.463250743 +0200
> @@ -810,9 +810,9 @@ __ip_vs_update_dest(struct ip_vs_service
>  	dest->u_threshold = udest->u_threshold;
>  	dest->l_threshold = udest->l_threshold;
> 
> -	spin_lock(&dest->dst_lock);
> +	spin_lock_bh(&dest->dst_lock);
>  	ip_vs_dst_reset(dest);
> -	spin_unlock(&dest->dst_lock);
> +	spin_unlock_bh(&dest->dst_lock);
> 
>  	if (add)
>  		ip_vs_new_estimator(&dest->stats);
> 
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