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Date: Thu, 28 Nov 2013 12:23:55 -0800
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Subject: Re: [tip:sched/urgent] sched: Check sched_domain before computing
 group power
From: Yinghai Lu <yinghai@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: David Rientjes <rientjes@google.com>, Ingo Molnar <mingo@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        srikar@linux.vnet.ibm.com, Thomas Gleixner <tglx@linutronix.de>,
        "linux-tip-commits@vger.kernel.org" 
	<linux-tip-commits@vger.kernel.org>
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On Thu, Nov 28, 2013 at 1:38 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> On Wed, Nov 27, 2013 at 11:07:04PM -0800, Yinghai Lu wrote:
>> On Wed, Nov 27, 2013 at 7:02 PM, David Rientjes <rientjes@google.com> wrote:
>> > On Thu, 21 Nov 2013, Yinghai Lu wrote:
>> >
>> >> original one in linus's tree:
>> >>
>> >> [    8.952728] NMI watchdog: enabled on all CPUs, permanently consumes
>> >> one hw-PMU counter.
>> >> [    8.965697] BUG: unable to handle kernel NULL pointer dereference
>> >> at 0000000000000010
>> >> [    8.969495] IP: [<ffffffff810d7b53>] update_group_power+0x1d3/0x250
>> >
>> > This should have been fixed by Srikar's patch, no?
>>
>> maybe not related, now in another system, linus's tree + Srikar's patch.
>
> And this another such -EX system? And from what I can tell its during
> boot, right?

Ivybridge EX, yes.