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    SubjectRe: 3.5-rc6 futex_wait_requeue_pi oops.
    On Fri, Jul 13, 2012 at 08:47:38PM +0200, Thomas Gleixner wrote:
    > On Fri, 13 Jul 2012, Dave Jones wrote:
    >
    > > Looks like calling futex() with garbage makes things unhappy.
    >
    > WARN_ON(!&q.pi_state);
    > pi_mutex = &q.pi_state->pi_mutex;
    > ret = rt_mutex_finish_proxy_lock(pi_mutex, to, &rt_waiter, 1);
    > debug_rt_mutex_free_waiter(&rt_waiter);
    >
    > So there is some weird way which causes q.pi_state = NULL. Dave, did
    > you see the warning before the oops happened ?

    No, that didn't seem to trigger.

    Dave



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