linux-kernel - Re: tracing ring_buffer

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Message-ID: <20120524191147.GA13936@redhat.com>
Date:	Thu, 24 May 2012 15:11:47 -0400
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: tracing ring_buffer_resize oops.

On Thu, May 24, 2012 at 02:54:32PM -0400, Steven Rostedt wrote:
 > On Thu, 2012-05-24 at 14:47 -0400, Dave Jones wrote:
 > > On Thu, May 24, 2012 at 01:35:14PM -0400, Steven Rostedt wrote:
 > > 
 > >  > Hmm, I wonder if this is the break point change :-/
 > >  > 
 > >  > Do you have NMIs enabled? I didn't have 'paranoid_exit' in my backtrace
 > >  > when I saw the bug.
 > > 
 > > $ grep NMI .config
 > > CONFIG_OPROFILE_NMI_TIMER=y
 > > CONFIG_HAVE_PERF_EVENTS_NMI=y
 > > CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
 > > CONFIG_HPWDT_NMI_DECODING=y
 > > # CONFIG_DEBUG_NMI_SELFTEST is not set
 > 
 > Could you email your entire config. I haven't been able to trigger the
 > bug again. Maybe your config might do it :-/

http://fpaste.org/BTN7/raw/

 > Also, how reproducible is it? When it triggered for me, it was constant.
 > Every boot and test failed. But after I did the make mrproper, I have
 > not been able to trigger it again. This is why I put it down as a bad
 > build.

happens every time for me so far.

	Dave 
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