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: Sun, 12 May 2013 18:52:17 +0300
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Cc: Abel Gordon <ABELG@il.ibm.com>,
	Jan Kiszka <jan.kiszka@siemens.com>,
	"Nakajima, Jun" <jun.nakajima@intel.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	kvm-owner@vger.kernel.org
To: Kashyap Chamarthy <kashyap.cv@gmail.com>
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On Sun, May 12, 2013 at 07:01:43PM +0530, Kashyap Chamarthy wrote:
> > So, from the above info shadow-vmcs is ruled-out. I'm trying to
> > investigate further, will post details if I have new findings.
> 
> Update:
> ---------
> 
> I just tried to create L2 w/  Fedora-19 TC4 compose of 11MAY2013, I
> contibuously see the below fragment (F18/F19, whatever the L2 guest
> is):
> 
> --------------------
> ....
> [  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?

> However I have neither HPET or NMI Watchdog enabled on L0/L1. I checked it by:
> 
> $ cat /etc/grub2.cfg  | egrep -i 'hpet|nmi'
> 
IIRC watchdog is enabled by default.

> I wonder if I'm missing something trivial, or maybe this is some kind
> of bug that needs more deeper investigation. But Jan Kiszka reported
> he isn't seeing any probs (but he isn't using "Haswell" ).
> 
> Thanks.

--
			Gleb.