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

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Date:	Sun, 21 Feb 2010 18:55:52 +0800
From:	Xiaotian Feng <xtfeng@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Américo Wang <xiyou.wangcong@...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 Sun, Feb 21, 2010 at 6:43 PM, Johannes Berg
<johannes@...solutions.net> wrote:
> Incidentally, the machine also freezes hard without any output at all if
> I "echo 0 > /sys/.../cpu1/online".

It might be nothing related with cpufreq. I think there's something
wrong during the _cpu_down path.
put more debug printks into _cpu_down(), if we can find kernel is
stuck in which place in _cpu_down, it would be helpful.

>
> johannes
>
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