Description of problem:
xm fails to communicate with the xend service.

Version-Release number of selected component (if applicable):
xen-3.0.1-4
and
xen-3.0.2-0.FC5.1 from updates-testing

How reproducible: Always


Steps to Reproduce:
1. /sbin/service xend start
2. xm list
3.
  
Actual results:
Error: Error connecting to xend: No such file or directory.  Is xend running?

Expected results:
A list showing Dom0

Additional info:

Runing FC5 with the latest updates as of 05/11/2006.  (yum update).
uname -r output:
2.6.16-1.2111_FC5xen0

selinux is disabled in /etc/selinux/config:
SELINUX=disabled

I've tried both xen rpms from updates, as well as updates-testing.

both versions create these .pid files in /var/run:
-rwS--x--T 1 root root 5 May 11 11:13 xenconsoled.pid
-rw-r--r-- 1 root root 4 May 11 11:13 xend.pid
-rw------- 1 root root 5 May 11 11:13 xenstore.pid

some of the attributes for xenconsoled.pid seem odd btw...
out of all of those pid files, only the xend.pid has a matching, running process
with the same id.
xend.pid:
1516
xenstore.pid:
1510
xenconsoled.pid:
1515
ps ax|grep "xen"
 1513 ?        S      0:00 python /usr/sbin/xend start
 1516 ?        Sl     0:00 python /usr/sbin/xend start

netstat -a -n -p|grep python with updates-testing version of xen
(xen-3.0.2-0.FC5.1) shows:
tcp        0      0 0.0.0.0:8002                0.0.0.0:*                  
LISTEN      1516/python

netstat -a -n -p|grep python with updates version of xen ( xen-3.0.1-4) shows an
additional listening socket:
tcp        0      0 0.0.0.0:8002                0.0.0.0:*                  
LISTEN      1593/python
unix  2      [ ACC ]     STREAM     LISTENING     5306   1593/python        
/var/lib/xend/relocation-socket

Other things to note:
socket and socket_ro are created in /var/run/xendstored when the xend service is
started, and /var/lib/xenstored/tdb is created as well.

Stopping the xend service, doesn't wipe out any .pid file, nor those the socket,
socket_ro or that tdb file, but the running processes do die.

running /usr/sbin/xend trace_start shows these exceptions:

--cut--
|     102     try:
|     103         inst
|    ! Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/xen/xend/XendNode.py", line 103, in
instance
    inst
NameError: global name 'inst' is not defined
|     104     except:
|     105         inst = XendNode()
|    |> XendNode.py:__init__
|    |  31         self.xc = xen.lowlevel.xc.xc()
--cut--

--cut--
|     546     try:
|     547         inst
|    ! Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/xen/xend/XendDomain.py", line 547, in
instance
    inst
NameError: global name 'inst' is not defined
|     548     except:
|     549         inst = XendDomain()
|    |> XendDomain.py:__init__
|    |  60         self.domains = {}
|    |  61         self.domains_lock = threading.RLock()
--cut--

--cut--
|    |      17         if not xs_handle:
|    |      18             xs_handle = xen.lowlevel.xs.xs()
|    |    ! Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/xen/xend/xenstore/xsutil.py", line 18,
in xshandle
    xs_handle = xen.lowlevel.xs.xs()
RuntimeError: (111, 'Connection refused')
|    |    < xenstore/xsutil.py:xshandle
--cut--

with more of those 111, 'Connection refused' following...  I've included the
complete xend.trace file.