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Subject: Re: 2.6.33: ftrace triggers soft lockup
From: Steven Rostedt <rostedt@goodmis.org>
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To: Li Zefan <lizf@cn.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       =?ISO-8859-1?Q?Am=E9rico?= Wang <xiyou.wangcong@gmail.com>,
       LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>
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Organization: Kihon Technologies Inc.
Date: Sat, 13 Mar 2010 12:56:16 -0500
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On Fri, 2010-03-12 at 21:07 -0500, Steven Rostedt wrote:
> 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.

Li,

I ran your test for 13 hours on three different machines. I did not hit
any more errors. Although I see a lockdep warning (not a locking problem
but the WARN_ON in fork.c is triggering). I'll look into that on Monday.

Please take the new patches that Ingo just pushed to Linus, if you find
any more bugs, please let me know right away.

Thanks!

-- Steve