linux-kernel - Re: 2.6.33: ftrace triggers soft lockup

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Message-ID: <2375c9f91003031858g87fa483t297417f4d6af063b@mail.gmail.com>
Date:	Thu, 4 Mar 2010 10:58:44 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	rostedt@...dmis.org
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.33: ftrace triggers soft lockup

On Wed, Mar 3, 2010 at 9:05 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> On Wed, 2010-03-03 at 14:04 +0800, Américo Wang wrote:
>> Hi, Steven, Frederic, Ingo,
>>
>> I am not sure if this is ftrace's fault, but it is ftrace who triggers
>> the soft lockup. On my machine, it is pretty easy, just run:
>>
>> echo function_graph > current_tracer
>>
>> I found this when 2.6.33-rc7, but forgot to report here. I just tried today's
>> Linus tree, it still has this problem.
>>
>> Attached are the full soft lockup warnings.
>>
>> Below is my related configs:
>
> Actually this is not enough for me. Could you send me the full config,
> as well as the full dmesg, not just the dump.
>

Full dmesg: http://pastebin.ca/1822197
Full config: http://pastebin.ca/1822201

Note, I changed some tracing unrelated config after getting that soft lockup,
so it would not matter.
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