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    SubjectRe: BUG: unable to handle kernel NULL pointer dereference in ipv6_select_ident
    On 21/12/2011 20:52, Eric Dumazet wrote:
    > Le mercredi 21 décembre 2011 à 21:28 +0100, Eric Dumazet a écrit :
    >> Le mercredi 21 décembre 2011 à 20:05 +0000, Chris Boot a écrit :
    >>> On 21/12/2011 18:00, Eric Dumazet wrote:
    >>>> Le mercredi 21 décembre 2011 à 18:36 +0100, Eric Dumazet a écrit :
    >>>>
    >>>>> 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@bootc.net

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