Re: BUG: unable to handle kernel NULL pointer dereference in ipv6_select_ident

[Chris Boot]

On 21/12/2011 20:52, Eric Dumazet wrote:
> Le mercredi 21 dÃcembre 2011 Ã 21:28 +0100, Eric Dumazet a Ãcrit :
> > Le mercredi 21 dÃcembre 2011 Ã 20:05 +0000, Chris Boot a Ãcrit :
> > > On 21/12/2011 18:00, Eric Dumazet wrote:
> > > > Le mercredi 21 dÃcembre 2011 Ã 18:36 +0100, Eric Dumazet a Ãcrit :
> > > >
> > > > > Good point, thats a different problem then, since 3.1 is not supposed to
> > > > > have this bug.
> > > > >
> > > > > It seems rt->rt6i_peer points to invalid memory in your crash.
> > > > >
> > > > > (RBX=00000000000001f4)
> > > > >
> > > > > 8b 83 a4 00 00 00       mov    0xa4(%rbx),%eax    p->refcnt
> > > > > 1f4+a4 ->   CR2=0000000000000298
> > > > It would help if you can confirm latest linux tree can reproduce the
> > > > bug.
> > > Hi Eric,
> > >
> > > I just built a v3.2-rc6-140-gb9e26df with the same config as the Debian
> > > 3.1.0 kernel. I can reproduce the bug just as easily with this kernel as
> > > with the Debian kernel. Unfortunately I wasn't able to get an entire
> > > trace, for some reason it didn't appear to be printed to the serial port
> > > and hung after the (long) list of loaded kernel modules. The crash
> > > happens at the same offset:
> > Thanks !
> >
> > Oh well, br_netfilter fake_rtable strikes again.
> >
> > I'll cook a patch in a couple of minutes...
> Could you try following patch ?
>
> [snip]

Eric,

It looks good! The rsync that caused the crash real quick hasn't done it 
at all with the patch applied. I'll keep testing it of course, but I 
think that's done it.

Many thanks indeed!

Chris

--
Chris Boot
bootc@xxxxxxxxx

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