linux-kernel - Re: 3.12.9-rt13: BUG: soft lockup

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Message-ID: <20140307131341.GC8637@linutronix.de>
Date:	Fri, 7 Mar 2014 14:13:41 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Kacur <jkacur@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 3.12.9-rt13: BUG: soft lockup

* Fernando Lopez-Lezcano | 2014-02-13 14:56:09 [-0800]:

>On 02/13/2014 02:25 PM, Thomas Gleixner wrote:
>>On Wed, 12 Feb 2014, Fernando Lopez-Lezcano wrote:
>>>[771508.546449] RIP: 0010:[<ffffffff810dc60a>]  [<ffffffff810dc60a>]
>>>smp_call_function_many+0x2ca/0x330
>>
>>Can you decode the exact location inside of smp_call_function_many via
>>addr2line please ?
>
>Hope this is useful (adding 0x2ce/0x330 as offsets does not make any
>difference, don't know if it should)...

ffffffff810dc60a is the location where the CPU is atm. The address of
smp_call_function_many() + 0x2ca should give the same value. 0x330 says
that the function is 0x330 bytes in size. 
that means, if you do the math, you learn that smp_call_function_many()
starts at 0xffffffff810dc340 and ends at 0xffffffff810dc66f.

Sebastian
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