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

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Message-ID: <4C359D5A.1050906@redhat.com>
Date:	Thu, 08 Jul 2010 12:41:46 +0300
From:	Avi Kivity <avi@...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,
	Glauber Costa <glommer@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [patch 134/149] x86, paravirt: Add a global synchronization	point
 for pvclock

On 07/07/2010 03:47 PM, 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.
>    

I'm unable to reproduce.

Can you provide the stack trace where this hangs?  Add 
CONFIG_DEBUG_INFO, and then

- copy vmlinux somewhere on the host filesystem
- start the guest
- when it hangs, type 'gdbserver' in the qemu monitor
- on the host, the 'gdb /path/to/vmlinux'
- 'target remote :1234'
- 'backtrace'

-- 
error compiling committee.c: too many arguments to function

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