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sched: fix new task startup crash

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Child task may be added on a different cpu that the one on which parent
is running. In which case, task_new_fair() should check whether the new
born task's parent entity should be added as well on the cfs_rq.

Patch below fixes the problem in task_new_fair.

This could fix the put_prev_task_fair() crashes reported.

Reported-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Reported-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Srivatsa Vaddagiri 2007-10-17 16:55:11 +02:00 • committed by Ingo Molnar
parent b1a8c172c3
commit b9dca1e0fc
2 changed files with 2 additions and 6 deletions
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2
kernel/sched.c
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@ -1712,7 +1712,7 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
p->prio = effective_prio(p); p->prio = effective_prio(p);
if (!p->sched_class->task_new || !current->se.on_rq || !rq->cfs.curr) { if (!p->sched_class->task_new || !current->se.on_rq) {
activate_task(rq, p, 0); activate_task(rq, p, 0);
} else { } else {
/* /*

6
kernel/sched_fair.c
View file

@ -1031,12 +1031,8 @@ static void task_new_fair(struct rq *rq, struct task_struct *p)
swap(curr->vruntime, se->vruntime); swap(curr->vruntime, se->vruntime);
} }
update_stats_enqueue(cfs_rq, se);
check_spread(cfs_rq, se);
check_spread(cfs_rq, curr);
__enqueue_entity(cfs_rq, se);
account_entity_enqueue(cfs_rq, se);
se->peer_preempt = 0; se->peer_preempt = 0;
enqueue_task_fair(rq, p, 0);
resched_task(rq->curr); resched_task(rq->curr);
} }