From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andre Przywara <andre.przywara@amd.com>
Subject: xl vcpu-set crashes Dom0
Date: Mon, 28 Feb 2011 18:23:19 +0100
Message-ID: <4D6BDA07.2010707@amd.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"; format=flowed
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: Juergen Gross <juergen.gross@ts.fujitsu.com>, xen-devel <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

Hi,

as mentioned earlier today I had some issues with patch 22934, which 
decreases the number of vCPUs for Dom0 in case of cpupool-numa-split.
I now found that this is not directly related to this patch, as it 
triggers also with "xl vcpu-set". So far I tried the following combinations:
c/s 22956 on a machine with 48 physical CPUs:
not restricted dom0:
	xl vcpu-set 0 6  => crashes
         xl vcpu-set 0 47 => crashes
dom0_max_vcpus=6
	xl vcpu-set 0 5  => crashes
         xm vcpu-set 0 5  => crashes

The only message I get is:
root@dosorca:~# xm vcpu-set 0 5
(XEN) Domain 0 crashed: rebooting machine in 5 seconds.

Debugging turned out that for instance the libxl_set_vcpuonline() 
returns without an error, but the machine then crashes afterwards.

Can someone reproduce this? Any ideas?

Regards,
Andre.

-- 
Andre Przywara
AMD-OSRC (Dresden)
Tel: x29712