netdev - Re: Fw: [Bug 75571] New: using tc action mirred results BUG at net/core/skbuff.c:119

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Date:	Fri, 9 May 2014 11:31:52 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	netdev <netdev@...r.kernel.org>, d77190@...l.ru
Subject: Re: Fw: [Bug 75571] New: using tc action mirred results BUG at net/core/skbuff.c:119

On Thu, May 8, 2014 at 3:13 AM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
> Hi Cong,
>
> Sorry for the latency - on travel mode.
>
>
> On 05/06/14 18:30, Cong Wang wrote:
>>
>> On Tue, May 6, 2014 at 8:16 AM, Stephen Hemminger
>> <stephen@...workplumber.org> wrote:
>
>
>>
>> Hmm, looks like we pushed wrong header size here. tcf_mirred_init()
>> checks if we could push hard header by checking the type of the target
>> device,
>> while in tcf_mirred() we push the ->hard_header_len of the source device
>> where this skb is received. I am not sure at all.
>>
>> Jamal, does the following patch make any sense for you?
>>
>
> Dont feel like that patch would help. Scratching my head....
> One way to tell is to: ifconfig down the source (which seems like tunnel
> device) and install all the rules then last step is ifconfig first ifb,
> then the tunnel device. And if it works with current kernel patch is not
> needed. It feels like some race condition between installing
> rule and using it i.e rule gets installed and when still trying to
> advertise to user space, a packet arrives and starts using it.
> If the above works - then the question to d77190@...l.ru is what kernel
> this is and when did this last work as installed?

It's an old kernel, 3.2.58. :-/

Please try to reproduce it on the latest kernel if possible.
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