netdev - Re: Bug 75571

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Message-ID: <CAHA+R7Oog=fAGjcfVTus2HdCt_Vv-1XDFePR3mLb0FM1N3q0ow@mail.gmail.com>
Date:	Mon, 2 Jun 2014 14:19:52 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Alex <d77190@...l.ru>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Bug 75571

On Sun, May 25, 2014 at 11:20 PM, Alex <d77190@...l.ru> wrote:
> Hello!
> I caught a bug and adviced to post it to this list from
> https://bugzilla.kernel.org/show_bug.cgi?id=75571
>
> I tried ifconfig interfaces down (both tun and ifb) before setting rules
> with no luck. This is new trace from kernel 3.2.59.
>
> [ 2945.851717] skb_under_panic: text:f9ca8566 len:209 put:148
> head:ece89000 data:ece88fce tail:0xece8909f end:0xece89140 dev:tun4177

Could you try the following patch? We need to call skb_cow_head() before
skb_push().

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