netdev - Re: oops in pskb_expand_head

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Date:	Mon, 18 Nov 2013 23:25:43 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	Michele Baldessari <michele@...syn.org>, netdev@...r.kernel.org
Subject: Re: oops in pskb_expand_head - 3.11.6

On Mon, Nov 18, 2013 at 10:24:36AM +0100, Jiri Pirko wrote:
> Mon, Nov 18, 2013 at 10:19:22AM CET, michele@...syn.org wrote:
> >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.
> 
> It goes hand in hand with 6aafeef03b9d9ecf255f3a80ed85ee070260e1ae.
> Without 9037c3579a277f3a23ba476664629fda8c35f7c4 skbs that reasm len is
> < MTU would not get fragmented which is not desired.

Jiri, David, do you see problems adding this to stable? We got a lot of
reports because of exactly those kind of crashes in the past.

Greetings,

  Hannes
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