Commit dc7fab8b authored Jul 10, 2008 by Dmitry Adamushko Committed by Ingo Molnar Jul 10, 2008

sched: fix cpu hotplug



I think we may have a race between try_to_wake_up() and
migrate_live_tasks() -> move_task_off_dead_cpu() when the later one
may end up looping endlessly.

Interrupts are enabled on other CPUs when migration_call(CPU_DEAD, ...) is
called so we may get a race between try_to_wake_up() and
migrate_live_tasks() -> move_task_off_dead_cpu(). The former one may push
a task out of a dead CPU causing the later one to loop endlessly.

Heiko Carstens observed:

| That's exactly what explains a dump I got yesterday. Thanks for fixing! :)

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Cc: miaox@cn.fujitsu.com
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Avi Kivity <avi@qumranet.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 619b0488

kernel/sched.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -5621,8 +5621,10 @@ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu)

		double_rq_lock(rq_src, rq_dest);
		/* Already moved. */
		if (task_cpu(p) != src_cpu)
		if (task_cpu(p) != src_cpu) {
		ret = 1;
		goto out;
		}
		/* Affinity changed (again). */
		if (!cpu_isset(dest_cpu, p->cpus_allowed))
		goto out;