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

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Message-ID: <7b6bb4a51002210312o2a1d070aneb54c107aeab6952@mail.gmail.com>
Date:	Sun, 21 Feb 2010 19:12:46 +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 6:55 PM, Xiaotian Feng <xtfeng@...il.com> wrote:
> 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.

and it looks like this breakage is only seen on powerMac G5, so it
might be arch specific. Maybe some commit in powermac breaks G5's
cpu_down, just a guess ;-)

>
>>
>> johannes
>>
>
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