linux-kernel - Re: [patch 134/149] x86, paravirt: Add a global synchronization point for pvclock

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Date:	Wed, 7 Jul 2010 10:51:40 -0300
From:	Glauber Costa <glommer@...hat.com>
To:	Peter Palfrader <peter@...frader.org>, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Zachary Amsden <zamsden@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [patch 134/149] x86, paravirt: Add a global synchronization
 point for pvclock

On Wed, Jul 07, 2010 at 02:47:31PM +0200, Peter Palfrader wrote:
> Hey,
> 
> Greg KH schrieb am Donnerstag, dem 01. Juli 2010:
> 
> > 2.6.32-stable review patch.  If anyone has any objections, please let us know.
> 
> 2.6.32.16 fails to boot on my KVM domains using qemu-kvm 0.11.1.
> 
> Bisecting between 2.6.32.14 which worked and .16 turned up this commit
> as the first culprit[0].
> 
> The host is still running 2.6.32.14 and has 8 cores on 2 CPUs.  The
> single-cpu KVM domain hangs just after printing 'Write protecting the
> kernel read-only data: 9492k'[1].   On a successful boot this line would
> usually be followed by 'INIT: version 2.86 booting'.
> 
> A 2.6.32.16 with this patch reverted boots fine.
> 
> If there's any info you need please just ask.
if you boot with another clocksource, and then switch to kvmclock with the machine already
running, do you see anything strange or suspicious?
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