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

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Message-ID: <52FDB71F.2020000@ccrma.stanford.edu>
Date:	Thu, 13 Feb 2014 22:26:39 -0800
From:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	nando@...ma.Stanford.EDU,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	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

On 02/13/2014 03:55 PM, Thomas Gleixner wrote:
> On Thu, 13 Feb 2014, Fernando Lopez-Lezcano wrote:
>
>> 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)...
>>
>> # grep smp_call_function /var/log/messages|tail -1
>> Feb 12 14:18:21 cmn27 kernel: [771840.224419] RIP: 0010:[<ffffffff810dc60e>]
>> [<ffffffff810dc60e>] smp_call_function_many+0x2ce/0x330
>> # addr2line -e
>> /usr/lib/debug/lib/modules/3.12.10-300.rt15.1.fc20.ccrma.x86_64+rt/vmlinux
>> ffffffff810dc60e
>> /usr/src/debug/kernel-3.12.fc20.ccrma/linux-3.12.10-300.rt15.1.fc20.ccrma.x86_64/kernel/rtmutex.c:1295
>
> I can't see how the kernel decoder thinks it's smp_call_function_many
> but addr2line looks at rtmutex.c
>
> That doesn't make any sense at all. Version mismatch?

Indeed, sorry for the mixup... here I go again, hopefully this one will 
make sense:

# addr2line -e 
/usr/lib/debug/lib/modules/3.12.9-301.rt13.1.fc20.ccrma.x86_64+rt/vmlinux ffffffff810dc60e
/usr/src/debug/kernel-3.12.fc20.ccrma/linux-3.12.9-301.rt13.1.fc20.ccrma.x86_64/kernel/smp.c:108

-- Fernando
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