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

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Message-ID: <4B8F0DE9.1070907@cn.fujitsu.com>
Date:	Thu, 04 Mar 2010 09:33:29 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.33: ftrace triggers soft lockup

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.
> 

I can also trigger soft lockup while running a stress test for ftrace.

I'll post detailed information after more testing.

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