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Date: Wed, 5 Mar 2008 16:53:14 +0300 From: Oleg Nesterov <oleg@...sign.ru> To: Gautham R Shenoy <ego@...ibm.com> Cc: Yi Yang <yi.y.yang@...el.com>, Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are dealocked when cpu is set to offline On 03/05, Gautham R Shenoy wrote: > > On Tue, Mar 04, 2008 at 06:01:07PM +0300, Oleg Nesterov wrote: > > On 03/04, Gautham R Shenoy wrote: > > > > > > So at times, the callback thread is blocked on kthread_stop(k) in > > > softlockup.c, while other time, it was blocked in > > > cleanup_workqueue_threads() in workqueue.c. > > > > >From another message: > > > > > > However, it remains in R< state > > > > What about cwq->thread? Was it TASK_RUNNING too? > > No, it was in TASK_UNINTERRUPTIBLE state. The last thing it ever > executed was the wait_for_completion in flush_cpu_workqueue() You misunderstood ;) The task doing _cpu_down() hang in flush_cpu_workqueue(), because cwq->thread doesn't want to die. But what was cwq->thread->state? Could you try the patch? Yi constantly sees the tasks in R< state. I am starting to suspect some scheduling issue. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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