[Xen-users] Xen 4.2 on CentOS 6.4 - domU's became (null) after reboot

[Инесса Матузная <inessa.mat@xxxxxxxxx>]

Hello,

I use centos 6.4 for dom0 and Ubuntu Server 12.04 for my domU's. Recently, there was a need to restart the few domU's after some updates via "apt-get upgrade". I connected to one of the domU's (called "logs01") via command "xl vncviewer <domain_id>" and made "reboot". After that, I looked up a list of domains and saw logs01 became (null):

[root@dom0 ~]# xl list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  4096    24     r-----   48374.8
(null)                                      12     0     1     --psrd    2970.1
...
...

The same situation has repeated with one more domU, and I can't destroy it with command "xl destroy <domain_id>":

[root@dom0 ~]# xl destroy 12
libxl: error: libxl_dm.c:1245:libxl__destroy_device_model: could not find device-model's pid for dom 12
libxl: error: libxl.c:1414:libxl__destroy_domid: libxl__destroy_device_model failed for 12

Post logs01.hvm config-file:

# =====================================================================
# Example HVM guest configuration
# =====================================================================
#
# This is a fairly minimal example of what is required for an
# HVM guest. For a more complete guide see xl.cfg(5)

# This configures an HVM rather than PV guest
builder = "hvm"

# Guest name
name = "logs01.hvm"

# 128-bit UUID for the domain as a hexadecimal number.
# Use "uuidgen" to generate one if required.
# The default behavior is to generate a new UUID each time the guest is started.
#uuid = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"

# Enable Microsoft Hyper-V compatibile paravirtualisation /
# enlightenment interfaces. Turning this on can improve Windows guest
# performance and is therefore recommended
#viridian = 1

# Initial memory allocation (MB)
memory = 512

# Maximum memory (MB)
# If this is greater than `memory' then the slack will start ballooned
# (this assumes guest kernel support for ballooning)
#maxmem = 512

# Number of VCPUS
vcpus = 1

# Network devices
# A list of 'vifspec' entries as described in
# docs/misc/xl-network-configuration.markdown
vif = [ 'bridge=xenbr40' ]

# Disk Devices
# A list of `diskspec' entries as described in
# docs/misc/xl-disk-configuration.txt
disk = [
        '/dev/vg_pcam_0/logs01_root,raw,xvda,rw',
        '/dev/vg_pcam_0/logs01_swap,raw,xvdb,rw',
        '/usr/local/distr/ubuntu-12.04.2-server-amd64.iso,,xvdc,cdrom']

# Guest VGA console configuration, either SDL or VNC
#sdl = 1
vnc = 1

Does anyone know how to fix it? Thanks in advance.

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