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

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Date:	Fri, 14 Feb 2014 11:43:34 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
cc:	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 Thu, 13 Feb 2014, Fernando Lopez-Lezcano wrote:
> 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

So it's stuck in csd_lock_wait(), which means that the csd of the
target cpu is not free.

Is the machine completely dead or can you still retrieve information
from it?

Thanks,

	tglx
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