netdev - Re: 3.12-rc7 regression - network panic from ipv6

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Message-ID: <alpine.LFD.2.03.1310292310180.2045@ssi.bg>
Date:	Tue, 29 Oct 2013 23:21:24 +0200 (EET)
From:	Julian Anastasov <ja@....bg>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
cc:	Meelis Roos <mroos@...ux.ee>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, steffen.klassert@...unet.com
Subject: Re: 3.12-rc7 regression - network panic from ipv6


	Hello,

On Tue, 29 Oct 2013, Hannes Frederic Sowa wrote:

> On Tue, Oct 29, 2013 at 10:33:36PM +0200, Meelis Roos wrote:
> > Some bad news - in a system where 3.12-rc6 and earlier worked fine, 
> > 3.12-rc7 panics or hangs repeatedly with network traffic (torrent being 
> > good test). First there is BUG from ipv6 code, followed by panic.
> 
> Could you do a bisect on this? There seems to be one commit for this
> particular function _decode_session6:
> 
> commit bafd4bd4dcfa13145db7f951251eef3e10f8c278
> Author: Steffen Klassert <steffen.klassert@...unet.com>
> Date:   Mon Sep 9 10:38:38 2013 +0200
> 
>     xfrm: Decode sessions with output interface.
>     
>     The output interface matching does not work on forward
>     policy lookups, the output interface of the flowi is
>     always 0. Fix this by setting the output interface when
>     we decode the session.
> 
> Maybe try to just revert this change locally and try again?

	At first look this change can work only for
forwarding, for output the skb_dst is attached later
in icmpv6_push_pending_frames. May be a check for present
skb_dst is needed.

Regards

--
Julian Anastasov <ja@....bg>
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