linux-kernel - Re: [2.6.33-rc5] Weird deadlock when shutting down

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Message-ID: <1266829490.5609.0.camel@jlt3.sipsolutions.net>
Date:	Mon, 22 Feb 2010 10:04:50 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Xiaotian Feng <xtfeng@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [2.6.33-rc5] Weird deadlock when shutting down

On Mon, 2010-02-22 at 16:34 +0800, Américo Wang wrote:
> On Sun, Feb 21, 2010 at 7:22 PM, Johannes Berg
> <johannes@...solutions.net> wrote:
> > On Sun, 2010-02-21 at 12:14 +0100, Johannes Berg wrote:
> >
> >>         printk("got cpu\n");
> >>         for_each_online_cpu(i) {
> >>                 sm_work = per_cpu_ptr(stop_machine_work,
> i);
> >>                 INIT_WORK(sm_work, stop_cpu);
> >>                 queue_work_on(i, stop_machine_wq, sm_work);
> >>         }
> >>         /* This will release the thread on our CPU. */
> >>         put_cpu();
> >>         printk("put cpu\n");
> >
> > As odd as that may be, it hangs in put_cpu() here.
> >
> 
> Hmm, does adding synchronize_sched() in _cpu_down() help?

No luck.

johannes

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