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    SubjectRe: debug rsdl 0.33
    Date
    On Monday 26 March 2007 04:28, Torsten Kaiser wrote:
    > On 3/24/07, Con Kolivas <kernel@kolivas.org> wrote:
    > > kernel/sched.c | 51
    > > +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51
    > > insertions(+)
    >
    > 2.6.21-rc4-mm1 also fails for me.
    >
    > I tried pure 2.6.21-rc4-mm1, +hotfixes, +hotfixes+rsdl33 and at last
    > also added above debug patch.

    Thank you very much for the effort!
    >
    > The oops from with the debug-patch added:
    > [ 65.426126] Freeing unused kernel memory: 312k freed
    > (on the console the system is starting up, getting until "Letting udev
    > process events ...")
    > [ 66.665611] Unable to handle kernel NULL pointer dereference at
    > 0000000000000020 RIP:
    > [ 66.682030] [<ffffffff8026167c>] __sched_text_start+0x4dc/0xa0e

    The debug patch didn't do anything. This means it is not an unset bitmap
    problem at all otherwise it should have self corrected itself.

    > The system in x86_64, two 2218 on a MCP55 nvidia chipset.
    >
    > 2.6.21-rc3-mm1 works fine.
    >
    > (gdb) list *0xffffffff8026167c
    > 0xffffffff8026167c is in schedule (kernel/sched.c:3619).

    next = list_entry(queue->next, struct task_struct, run_list);
    rq->prio_level = idx;

    > 3614 /*
    > 3615 * When the task is chosen it is checked to see if its
    > quota has been
    > 3616 * added to this runqueue level which is only performed
    > once per 3617 * level per major rotation for each running task.
    > 3618 */
    > 3619 if (next->rotation != rq->prio_rotation) {

    Urgh. Dereferencing there? That can only be next that's deferencing meaning
    the run_list entry is bogus. That should only ever be done under runqueue
    lock so I have a race somewhere where it's not. Time for more looking.

    > Torsten

    Thanks!

    --
    -ck
    -
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