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

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Date:	Fri, 5 Mar 2010 15:16:07 +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 Fri, Mar 5, 2010 at 12:14 PM, Américo Wang <xiyou.wangcong@...il.com> wrote:
> On Thu, Mar 4, 2010 at 9:54 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
>> On Wed, 2010-03-03 at 14:04 +0800, Américo Wang wrote:
>>> 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.
>>
>> So this is not present in 2.6.33-rc6? If you know approximately when it
>> appeared, would you be able to do a git bisect on it?
>>
>
> I can't say that because I didn't try -rc6.
>

Sigh, 2.6.33-rc6 doesn't work, even 2.6.32 doesn't work...
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