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Re: [Xen-users] xend does not start

To: Sriram Murali <msriram@xxxxxxxxxx>
Subject: Re: [Xen-users] xend does not start
From: David Cemin <davidcemin@xxxxxxxxx>
Date: Thu, 28 Oct 2010 13:52:20 -0200
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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2010/10/28 Sriram Murali <msriram@xxxxxxxxxx>

 first of all make sure that you are choosing option from the boot menu. 

Second, find the file site_customize.py. You can look for it using the command 'find / -name "sitecustomize.py" ' as root.(I do not have access to my machine right now, sorry!) It is somewhere in under the /etc/python... path. In that path the add the two import site lines as shown below:

# install the apport exception handler if available
import site

import site

import apport_python_hook
except ImportError:

Now xend should work. This is just a hack, maybe some one else has a better solution...


I've added these lines into /etc/python2.6/sitecustomize.py and tried to restart xend. Nothing changed. I am trying to recompile dom0 (pvops) with the 4.0.0 version (xen/master branch). Maybe I have some version mismatch between hypervisor and dom0. 

Thank you ! 


From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of David Cemin
Sent: October-28-10 7:57 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] xend does not start




I've downloaded the xen 4.0.1 version as it is explained here:


So, I've made a clone from repository, with the following command:

hg clone -r RELEASE-4.0.1 http://xenbits.xen.org/xen-4.0-testing.hg

And finally I've built xen, tools and stubdom.



I was looking for a paravirtualized domain, and so I follow the instructions from here:



So, I am able to boot dom0 successfully, but apparently xend its not starting.


A few things that I have noticed: 


1) lsmod does not list evtchn and neither gntdev, and they are not compiled as a Module. I have tried also to insert them with lsmod, and of course, I dont have them.

2) The nodes appear in both /proc/misc and /dev/xen, and the numbers are correct


% cat /proc/misc 

 52 freefall

224 tpm0

 53 network_throughput

 54 network_latency

 55 cpu_dma_latency

 56 device-mapper

  1 psaux

200 tun

 57 pktcdvd

228 hpet

 58 blktap-control

 59 xen/gntdev

 60 xen/evtchn

229 fuse

 61 ecryptfs

231 snapshot

227 mcelog

 62 rfkill

 63 vga_arbiter

% ll /dev/xen 

total 0

crw-rw---- 1 root root 10, 60 2010-10-27 17:32 evtchn

crw-rw---- 1 root root 10, 59 2010-10-27 17:32 gntdev


3) I am really running dom)

% cat /proc/xen/capabilities   



4) /var/log/xen shows the following errors:




[2010-10-27 17:32:31 1307] INFO (SrvDaemon:331) Xend Daemon started

[2010-10-27 17:32:31 1307] INFO (SrvDaemon:335) Xend changeset: Wed Aug 25 09:22:42 2010 +0100 21324:b536ebfba183.

[2010-10-27 17:32:31 1307] ERROR (SrvDaemon:347) Exception starting xend ((13, 'Permission denied'))

Traceback (most recent call last):

  File "/usr/lib/python2.6/dist-packages/xen/xend/server/SrvDaemon.py", line 339, in run

    servers = SrvServer.create()

  File "/usr/lib/python2.6/dist-packages/xen/xend/server/SrvServer.py", line 251, in create

    root.putChild('xend', SrvRoot())

  File "/usr/lib/python2.6/dist-packages/xen/xend/server/SrvRoot.py", line 40, in __init__


  File "/usr/lib/python2.6/dist-packages/xen/web/SrvDir.py", line 82, in get

    val = val.getobj()

  File "/usr/lib/python2.6/dist-packages/xen/web/SrvDir.py", line 52, in getobj

    self.obj = klassobj()

  File "/usr/lib/python2.6/dist-packages/xen/xend/server/SrvNode.py", line 30, in __init__

    self.xn = XendNode.instance()

  File "/usr/lib/python2.6/dist-packages/xen/xend/XendNode.py", line 752, in instance

    inst = XendNode()

  File "/usr/lib/python2.6/dist-packages/xen/xend/XendNode.py", line 87, in __init__

    self.other_config["xen_pagesize"] = self.xeninfo_dict()["xen_pagesize"]

  File "/usr/lib/python2.6/dist-packages/xen/xend/XendNode.py", line 741, in xeninfo_dict

    return dict(self.xeninfo())

  File "/usr/lib/python2.6/dist-packages/xen/xend/XendNode.py", line 685, in xeninfo

    info['xen_scheduler'] = self.xenschedinfo()

  File "/usr/lib/python2.6/dist-packages/xen/xend/XendNode.py", line 675, in xenschedinfo

    sched_id = self.xc.sched_id_get()

Error: (13, 'Permission denied')





Xend started at Wed Oct 27 17:32:31 2010.

domctl operation failed -- need to rebuild the user-space tool set?

sysctl operation failed -- need to rebuild the user-space tool set?

Exception starting xend: (13, 'Permission denied')

Exception in thread Thread-2:

Traceback (most recent call last):

  File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner


  File "/usr/lib/python2.6/dist-packages/xen/xend/XendMonitor.py", line 230, in run

    for domid, cputimes in self._get_cpu_stats().items():

  File "/usr/lib/python2.6/dist-packages/xen/xend/XendMonitor.py", line 208, in _get_cpu_stats

    for domain in self.xc.domain_getinfo():

Error: (13, 'Permission denied')




Does anyone have any Idea of how can I start xend correctly ?


Thank you!



David Cemin



David Cemin
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