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

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Message-ID: <2375c9f91002220022r63d209d0w2c0137bc1c2d2ec1@mail.gmail.com>
Date:	Mon, 22 Feb 2010 16:22:58 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Xiaotian Feng <xtfeng@...il.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	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 7:12 PM, Xiaotian Feng <xtfeng@...il.com> wrote:
> 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 ;-)
>

Maybe not, there could be some generic code bug that will only be
exposed on a specific arch.

Thanks.
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