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    SubjectRe: recent -git: BUG in free_thread_xstate
    On Fri, Aug 1, 2008 at 11:10 PM, Paul E. McKenney
    <paulmck@linux.vnet.ibm.com> wrote:
    > On Wed, Jul 23, 2008 at 01:31:09PM -0700, Suresh Siddha 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.
    >>
    >> >
    >> > BUG: unable to handle kernel paging request at 00664381
    >> > IP: [<c010b274>] free_thread_xstate+0x4/0x30
    >> ...
    >>
    >> > 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?
    >
    > I would also like to see the config file.

    Hi,

    I'm sorry for the late reply.

    I copied you because I saw some RCU entry in the stack trace, but it
    is almost definitely not a problem with (core or "leaf") RCU code.
    Sometimes it also happens that people will say "oh, I recognize this
    problem, the patch has been posted here and here", etc.

    It seems to be a problem with either netpoll, netconsole, or the
    8139too driver. I find a UDP packet in the task_struct slab, and the
    stacktrace with RCU entries come from unrelated, unfortunate callbacks
    that stumbled upon the corruption.

    My config, if you are still interested, can be found here:
    http://userweb.kernel.org/~vegard/bugs/20080724-fork/config

    I don't know if the problem persists with the latest -git, it is now a
    while since I last tested, but I've checked kernels back to 2.6.20, so
    the problem has existed for a long time.


    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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