From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: [nVMX with: v3.9-11789-ge0fd9af] Stack trace when L2 guest is
 rebooted.
Date: Mon, 13 May 2013 09:39:23 +0300
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Cc: Kashyap Chamarthy <kashyap.cv@gmail.com>,
	Abel Gordon <ABELG@il.ibm.com>,
	"Nakajima, Jun" <jun.nakajima@intel.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"kvm-owner@vger.kernel.org" <kvm-owner@vger.kernel.org>
To: Jan Kiszka <jan.kiszka@siemens.com>
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On Mon, May 13, 2013 at 08:31:33AM +0200, Jan Kiszka wrote:
> On 2013-05-12 18:52, Kashyap Chamarthy wrote:
> >>> --------------------
> >>> ....
> >>> [  217.938034] Uhhuh. NMI received for unknown reason 30 on CPU 0.
> >>> [  217.938034] Do you have a strange power saving mode enabled?
> >>> .[  222.523373] Uhhuh. NMI received for unknown reason 20 on CPU 0.
> >>> [  222.524073] Do you have a strange power saving mode enabled?
> >>> [  222.524073] Dazed and confused, but trying to continue
> >>> [  243.860319] Uhhuh. NMI received for unknown reason 30 on CPU 0
> >>> .....
> >>> --------------------
> >>> At the moment, L2 guest creation stuck at the above message
> >>>
> >> Are those in L2 dmesg or L1?
> > 
> > L2 dmesg.
> > 
> > 
> >>> $ cat /etc/grub2.cfg  | egrep -i 'hpet|nmi'
> >>>
> >> IIRC watchdog is enabled by default.
> > 
> > Indeed, you're right. I disabled NMI on L1, and rebooted the newly
> > created L2 guest starts just fine.
> 
> NMI watchdogs go via some perf counters theses days IIRC. Can anyone
> tell me which of those may be used in Kashyap's setup? I'm probably
> lacking them for my guests and therefore do not see the errors.
> 
Try running with -cpu host for L1. Your CPU definition probably lacks
PMU leaf.

--
			Gleb.