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    Subject2.6.{26.2,27-rc} oops on virtualbox

    Hi there,

    Users of different Linux distros (includes Ubuntu, Mandriva, ArchLinux and
    possibly Fedora) are reporting that kernel 2.6.26.2 is OOPSing in the
    Virtual Box emulator[1].

    It is not clear if this is a kernel or Virtual Box bug, but as the kernel
    is also OOPsing in QEMU (although with different behaivor) I have decided
    to post my debug results here in case someone is interested in debugging
    the kernel part further.

    I have done a bisection by hand among kernel versions and found that
    the commit which triggers the oops in _Virtual Box_ was introduced in
    2.6.26-rc1 and the problem also happens with latest Linus tree.

    By using git bisect I found that the commit is this:

    """
    commit e587cadd8f47e202a30712e2906a65a0606d5865
    Author: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    Date: Thu Mar 6 08:48:49 2008 -0500

    x86: enhance DEBUG_RODATA support - alternatives

    [...]

    """

    By reverting this commit I don't get the OOPS anymore. I have
    tested with 2.6.26-rc1 and latest Linus tree (2.6.27-rc3).

    What puzzles me though is that a similar problem happens with
    QEMU, but it also OOPSes with kernels before 2.6.26-rc1,
    reverting the patch above makes no difference and it works with
    current Linus tree.

    Does this look like a kernel bug?

    All my tests have been done with vanilla kernels, but I have
    built .iso installation images with them and I'm not sure of
    what the build script does.

    [1] http://en.wikipedia.org/wiki/Virtual_box

    Thanks for reading this.

    --
    Luiz Fernando N. Capitulino


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