[Xen-devel] Re: xend does not start

[David Cemin <davidcemin@xxxxxxxxx>]

I tried another approach.

Since I assume that my problem is with modules loading, I've compiled the kernel with xen-evtchn and xen-gntdev as modules. Now, I can load them with modprobe. They do appear loaded in lsmod

% lsmod | grep xen              

xen_gntdev              7486  0 

xen_evtchn              4617  1 

It seems that xend is running, as we can see in a ps:

% ps ax | grep xen 

   24 ?        S      0:00 [xenwatch]

   25 ?        S      0:00 [xenbus]

  851 ?        S      0:00 avahi-daemon: running [xenserver-laptop.local]

 2101 ?        S      0:00 xenstored --pid-file /var/run/xenstore.pid

 2105 ?        SLl    0:00 xenconsoled 

 2109 ?        S      0:00 /usr/bin/python /usr/sbin/xend start

 2110 ?        Sl     0:00 /usr/bin/python /usr/sbin/xend start

 2254 pts/0    S+     0:00 grep --color xen

But /var/log/xend.log shows that I have an exception during xend start:

[2010-10-28 11:10:52 2110] INFO (SrvDaemon:331) Xend Daemon started

[2010-10-28 11:10:52 2110] INFO (SrvDaemon:335) Xend changeset: Wed Aug 25 09:22:42 2010 +0100 21324:b536ebfba183.

[2010-10-28 11:10:52 2110] 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__

    self.get(name)

  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')

And I cant call any xm bin, as for example:

% xm list

Error: Unable to connect to xend: No such file or directory. Is xend running?

(1) % 

So, I'm kind of stuck here. Any Ideas? 

Thank you all, 

--

David

2010/10/27 David Cemin <davidcemin@xxxxxxxxx>

Hello, 

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

http://wiki.xensource.com/xenwiki/Xen4.0

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:

http://wiki.xensource.com/xenwiki/XenParavirtOps

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   

control_d

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

xend.log

[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__

    self.get(name)

  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-debug.log

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

    self.run()

  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
mobile: +55 51 93523097
home:   +55 51 32763785
email: davidcemin@xxxxxxxxx

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