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

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Date:	Fri, 12 Mar 2010 21:07:29 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.33: ftrace triggers soft lockup

On Tue, 2010-03-09 at 11:38 +0800, Li Zefan wrote:

> The segfault is from userspace. This is a segfault I just got:
> 
> ftrace_stack_ma[14989]: segfault at fe2e ip 00000000004474c0 sp 00007fffb97e38c0 error 4 in bash[400000+d1000]

Li and Lai,

Thanks a lot for reporting all this, and writing the ftrace_stress_test.
I've fixed all the bugs that it has reported (to my knowledge) and after
a little more testing I will soon be sending a patch series out.

Just wanted to say thanks again, your efforts have helped out
tremendously!

Americo,

I still do not know why the function graph tracer is making your system
unusable. I'll look more into that when I get a chance. So far, I have
not had any issues on any of my boxes.

-- Steve

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