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

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Message-ID: <4B95C2AF.7010508@cn.fujitsu.com>
Date:	Tue, 09 Mar 2010 11:38:23 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	rostedt@...dmis.org
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

Steven Rostedt wrote:
> On Tue, 2010-03-09 at 10:11 +0800, Li Zefan wrote:
>> Steven Rostedt wrote:
>>> On Mon, 2010-03-08 at 15:32 +0800, Li Zefan wrote:
> 
>>> This sounds like the compiler may have screwed up again. Can you compile
>>> with this patch and see if it catches anything?
>>>
>> But I was using a x86_64 machine, and this patch won't do anything on
>> x86_64?
> 
> I wonder if this issue has crept to x86_64. What kind of dump do you
> get? And if this segfault is in the kernel, could you see (using gdb on
> a vmlinux) if any of the stack frame setups look peculiar?
> 

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]
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