From: Oleg Nesterov <oleg@tv-sign.ru>
To: Gautham R Shenoy <ego@in.ibm.com>
Cc: Yi Yang <yi.y.yang@intel.com>, Ingo Molnar <mingo@elte.hu>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are dealocked when cpu is set to offline
Date: Wed, 5 Mar 2008 16:53:14 +0300 [thread overview]
Message-ID: <20080305135314.GA84@tv-sign.ru> (raw)
In-Reply-To: <20080305100509.GA9265@in.ibm.com>
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.
next prev parent reply other threads:[~2008-03-05 13:54 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-02 18:42 Yi Yang
2008-03-03 11:54 ` Dmitry Adamushko
2008-03-03 11:56 ` Ingo Molnar
2008-03-03 12:02 ` Dmitry Adamushko
2008-03-03 14:53 ` Yi Yang
2008-03-03 17:37 ` Yi Yang
2008-03-03 15:31 ` Gautham R Shenoy
2008-03-03 14:45 ` Yi Yang
2008-03-04 5:26 ` Gautham R Shenoy
2008-03-04 9:09 ` Gautham R Shenoy
2008-03-03 21:56 ` Yi Yang
2008-03-04 15:01 ` Oleg Nesterov
2008-03-04 14:37 ` Yi Yang
2008-03-06 20:05 ` Yi Yang
2008-03-05 10:05 ` Gautham R Shenoy
2008-03-05 13:53 ` Oleg Nesterov [this message]
2008-03-06 11:15 ` Gautham R Shenoy
2008-03-06 12:22 ` Gautham R Shenoy
2008-03-06 13:44 ` Gautham R Shenoy
2008-03-07 2:54 ` Oleg Nesterov
2008-03-07 9:10 ` Gautham R Shenoy
2008-03-07 10:51 ` Gautham R Shenoy
2008-03-06 23:20 ` Yi Yang
2008-03-07 13:02 ` Dmitry Adamushko
2008-03-07 13:55 ` Gautham R Shenoy
2008-03-07 15:50 ` Gautham R Shenoy
2008-03-07 19:14 ` [BUG 2.6.25-rc3] scheduler/hotplug: some processes aredealocked " Suresh Siddha
2008-03-07 20:18 ` [BUG 2.6.25-rc3] scheduler/hotplug: some processes are dealocked " Andrew Morton
2008-03-07 21:36 ` Rafael J. Wysocki
2008-03-07 23:01 ` Suresh Siddha
2008-03-07 23:29 ` Andrew Morton
2008-03-07 23:43 ` Rafael J. Wysocki
2008-03-08 1:50 ` Suresh Siddha
2008-03-08 2:09 ` Andrew Morton
2008-03-08 5:10 ` [PATCH] adjust root-domain->online span in response to hotplug event Gregory Haskins
2008-03-08 8:41 ` Ingo Molnar
2008-03-08 17:50 ` [PATCH] adjust root-domain->online span in response to hotplugevent Gregory Haskins
2008-03-09 0:31 ` Dmitry Adamushko
2008-03-10 14:12 ` Gregory Haskins
2008-03-09 2:35 ` [PATCH] adjust root-domain->online span in response to hotplug event Suresh Siddha
2008-03-10 12:41 ` Gregory Haskins
2008-03-10 8:14 ` Gautham R Shenoy
2008-03-10 13:13 ` [PATCH] cpu-hotplug: Register update_sched_domains() notifier with higher prio Gautham R Shenoy
2008-03-10 22:25 ` Andrew Morton
2008-03-10 13:39 ` [PATCH] keep rd->online and cpu_online_map in sync Gregory Haskins
2008-03-10 14:21 ` Gautham R Shenoy
2008-03-10 18:12 ` Suresh Siddha
2008-03-10 22:03 ` Rafael J. Wysocki
2008-03-10 22:00 ` Gregory Haskins
2008-03-10 22:10 ` Suresh Siddha
2008-03-10 21:59 ` [PATCH v2] " Gregory Haskins
2008-03-10 23:36 ` Andrew Morton
2008-03-11 1:34 ` Suresh Siddha
2008-03-11 4:39 ` Gautham R Shenoy
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