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    SubjectRe: recent -git: BUG in free_thread_xstate
    Hi!

    On Wed, Jul 23, 2008 at 10:31 PM, Suresh Siddha
    <suresh.b.siddha@intel.com> wrote:
    > On Wed, Jul 23, 2008 at 01:07:04PM -0700, Vegard Nossum wrote:
    >> Hi,
    >>
    >> I just got this on c010b2f76c3032e48097a6eef291d8593d5d79a6 (-git from
    >> yesterday):
    >
    > Do you see this in 2.6.26 aswell? I suspect it is coming from post 2.6.26
    > changes.

    Just reproduced it on latest linux-2.6.git.

    >> BUG: unable to handle kernel paging request at 00664381
    >> IP: [<c010b274>] free_thread_xstate+0x4/0x30
    > ...
    >

    The funny thing is that this number (00664281) is _always_ the same,
    even on the newer kernel. What's special about it?

    >> EIP is at arch/x86/kernel/process.c:36:
    >>
    >> if (tsk->thread.xstate) {
    >>
    >
    > It looks like the kernel stack of that process got corrupted, corrupting the
    > task pointer in thread_info. Can you send us your config file?

    It has been uploaded here:

    http://userweb.kernel.org/~vegard/bugs/20080724-fork/config

    Given the reproducible nature of this, I think I'll just go ahead and
    start a bisect...

    Thanks for looking :-)


    Vegard

    --
    "The animistic metaphor of the bug that maliciously sneaked in while
    the programmer was not looking is intellectually dishonest as it
    disguises that the error is the programmer's own creation."
    -- E. W. Dijkstra, EWD1036


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