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

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Message-ID: <2375c9f91003042014y17588865g8f9110e666ac2456@mail.gmail.com>
Date:	Fri, 5 Mar 2010 12:14:52 +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 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.

Ok, let me try to do a bisect, but since weekend is coming, I can't do
any testing during weekend, so will try it next Monday.

Thanks!
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