netdev - Re: oops in pskb_expand_head

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Date:	Mon, 18 Nov 2013 09:19:22 +0000
From:	Michele Baldessari <michele@...syn.org>
To:	netdev@...r.kernel.org, jiri@...nulli.us
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: oops in pskb_expand_head - 3.11.6

Hi Hannes,

On Sun, Nov 17, 2013 at 08:18:10PM +0100, Hannes Frederic Sowa wrote:
> On Sun, Nov 17, 2013 at 11:11:50AM +0000, Michele Baldessari wrote:
> > Hi Hannes,
> > 
> > On Sun, Nov 17, 2013 at 12:42:23AM +0100, Hannes Frederic Sowa wrote:
> > > On Sat, Nov 16, 2013 at 11:16:15PM +0000, Michele Baldessari wrote:
> > > > Two oops like the following were reported in Fedora 19 - kernel 3.11.6:
> > > > https://bugzilla.redhat.com/show_bug.cgi?id=1015905
> > > 
> > > I have not followed that issue that closely, but could you try linus tree
> > > or net-next?
> > > 
> > > Maybe those two patches improve the situation:
> > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9037c3579a277f3a23ba476664629fda8c35f7c4
> > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6aafeef03b9d9ecf255f3a80ed85ee070260e1ae
> > > 
> > indeed a current kernel seems to fix the crash (according to the
> > reporters). I'll see if I manage to bisect exactly.
> 
> Great, if you confirm this we can ask David if he adds the commits to the
> -stable queue.

I can confirm that 6aafeef03b9d9ecf255f3a80ed85ee070260e1ae "netfilter:
push reasm skb through instead of original frag skbs" fixes the oops
mentioned in this thread. I've applied it to a 3.11.8 kernel and it
fixed the crash. I had to slightly tweak it as it does not apply 100%
cleanly due to 795aa6ef6a1aba99050735eadd0c2341b789b53b " netfilter:
pass hook ops to hookfn". 

So definitely -stable material.

Not sure if you also want to add 9037c3579a277f3a23ba476664629fda8c35f7c4 
"ip6_output: fragment outgoing reassembled skb properly". It did not
have any impact in this particular scenario.

Thanks again,
Michele
-- 
Michele Baldessari            <michele@...syn.org>
C2A5 9DA3 9961 4FFB E01B  D0BC DDD4 DCCB 7515 5C6D
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