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    SubjectRe: Bug in scheduler when using rt_mutex
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    On Wed, Jan 19, 2011 at 9:30 PM, Peter Zijlstra <peterz@infradead.org> wrote:
    > +static void switched_from_fair(struct rq *rq, struct task_struct *p)
    > +{
    > +       struct sched_entity *se = &p->se;
    > +       struct cfs_rq *cfs_rq = cfs_rq_of(se);
    > +
    > +       /*
    > +        * Ensure the task's vruntime is normalized, so that when its
    > +        * switched back to the fair class the enqueue_entity(.flags=0) will
    > +        * do the right thing.
    > +        *
    > +        * If it was on_rq, then the dequeue_entity(.flags=0) will already
    > +        * have normalized the vruntime, if it was !on_rq, then only when
    > +        * the task is sleeping will it still have non-normalized vruntime.
    > +        */
    > +       if (!se->on_rq && p->state != TASK_RUNNING)
    > +               se->vruntime -= cfs_rq->min_vruntime;

    Here it's possible that se->vruntime is little than cfs_rq->min_vruntime.

    Thanks,
    Yong

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