linux-kernel - Re: BUG: aim7/specjbb2005/fio hang due to commit: 597a264b1a9c7e36d1728f

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Message-Id: <1276417016.2096.467.camel@ymzhang.sh.intel.com>
Date:	Sun, 13 Jun 2010 16:16:56 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	"Alex,Shi" <alex.shi@...el.com>
Cc:	john.r.fastabend@...el.com, davem@...emloft.net,
	yanmin.zhang@...el.com, tim.c.chen@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: BUG: aim7/specjbb2005/fio hang due to commit:
 597a264b1a9c7e36d1728f

On Sun, 2010-06-13 at 14:14 +0800, Alex,Shi wrote:
> The listed benchmark using loopback mode netio and all hang in 35-rc3
> testing. Yanmin and I found it is due to the commit
> 597a264b1a9c7e36d1728f677c66c5c1f7e3b837.
All these benchmark stops at network io reading to wait for data.

>  
> After revert this patch, all benchmarks can be recovered. Seems the
> following line is the suspicious. 
> 
> 
> 
> +       /*
> +        * bonding note: skbs received on inactive slaves should only
> +        * be delivered to pkt handlers that are exact matches.  Also
> +        * the deliver_no_wcard flag will be set.  If packet handlers
> +        * are sensitive to duplicate packets these skbs will need to
> +        * be dropped at the handler.  The vlan accel path may have
> +        * already set the deliver_no_wcard flag.
> +        */
>         null_or_orig = NULL;
>         orig_dev = skb->dev;
>         master = ACCESS_ONCE(orig_dev->master);
> -       if (master) {
> -               if (skb_bond_should_drop(skb, master))
> +       if (skb->deliver_no_wcard)
> +               null_or_orig = orig_dev;
> +       else if (master) {
> +               if (skb_bond_should_drop(skb, master)) {
> +                       skb->deliver_no_wcard = 1;
>                         null_or_orig = orig_dev; /* deliver only exact
> match */
> -               else
> +               } else
>                         skb->dev = master;
>         }
> 
> Thanks
> Alex 
> 
> --
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