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    SubjectRe: [RFC][PATCH][2.5] Possible race in wait_task_zombie and finish_task_switch
    On Sun, 25 May 2003, Manfred Spraul wrote:

    > - the reference for the stack itself, acquired by setting usage to 2,
    > dropped by schedule_tail.
    > - the reference for wait4, acquired by setting usage to 2, dropped by
    > wait_task_zombie.
    > - references for the pid structures, maintained by pid.c
    > - temporary references for looking at tsk->{fs,mm,files,tty}, used by
    > /proc, ptrace, tty.

    it's the one dropped by wait_task_zombie, the task coming out from
    schedule_tail is fine.

    >
    > >kernel BUG at kernel/sched.c:746!
    > >
    > >
    > Hmm. What is schedule.c:746? There is no BUG in that area in the bk tree.

    It's in finish_arch_switch at the put_task_struct()

    > Zwane, is it easy to reproduce the crash? I could write a patch that
    > adds 4 refcounters, then we could find out in which area we must look.

    I haven't found a direct way of triggering it, so far it's just been
    cropping up ~6 times over a period of 2days with the box normally taking a
    fatal one and dying completely.

    Zwane
    --
    function.linuxpower.ca
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