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From: Li Zefan <lizf@cn.fujitsu.com>
To: "Américo Wang" <xiyou.wangcong@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: 2.6.33: ftrace triggers soft lockup
Date: Thu, 04 Mar 2010 09:33:29 +0800	[thread overview]
Message-ID: <4B8F0DE9.1070907@cn.fujitsu.com> (raw)
In-Reply-To: <2375c9f91003022204p5bdab1fdj3b3500998575fc28@mail.gmail.com>

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.


  parent reply	other threads:[~2010-03-04  1:33 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-03  6:04 2.6.33: ftrace triggers soft lockup Américo Wang
2010-03-03 13:05 ` Steven Rostedt
2010-03-04  2:58   ` Américo Wang
2010-03-04  1:33 ` Li Zefan [this message]
2010-03-04  1:46 ` Frederic Weisbecker
2010-03-04  3:01   ` Américo Wang
2010-03-04  3:18     ` Steven Rostedt
2010-03-04  4:06       ` Frederic Weisbecker
2010-03-04  5:10       ` Américo Wang
2010-03-04  5:18         ` Frederic Weisbecker
2010-03-04 13:54 ` Steven Rostedt
2010-03-05  4:14   ` Américo Wang
2010-03-05  7:16     ` Américo Wang
2010-03-05 15:06       ` Steven Rostedt
2010-03-05 17:16         ` Frederic Weisbecker
2010-03-05 18:35           ` Steven Rostedt
2010-03-05 18:43             ` Frederic Weisbecker
2010-03-05 19:07               ` Steven Rostedt
2010-03-08  7:32           ` Li Zefan
2010-03-08 15:15             ` Steven Rostedt
2010-03-09  2:11               ` Li Zefan
2010-03-09  2:23                 ` Steven Rostedt
2010-03-09  3:38                   ` Li Zefan
2010-03-12 19:20                     ` Steven Rostedt
2010-03-12 21:38                       ` Steven Rostedt
2010-03-13  2:07                     ` Steven Rostedt
2010-03-13  5:37                       ` Américo Wang
2010-03-13  5:51                         ` Steven Rostedt
2010-03-14 16:55                         ` Steven Rostedt
2010-03-13 17:56                       ` Steven Rostedt
2010-03-15  1:46                         ` Li Zefan
2010-03-15 14:39                           ` Steven Rostedt
2010-03-15 16:16                             ` Steven Rostedt
2010-03-08  2:31         ` Américo Wang
2010-03-09  2:40           ` Américo Wang
2010-03-09  2:51             ` Steven Rostedt
2010-03-09  5:06               ` Américo Wang

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