Description of problem:
running `xm list` throws xmlrpclib.ProtocolError

xen-3.0.2-4
yum updated to rawhide-20060601
guest running rawhide-20060601 installer (via xenguest-install.py)
kernel 2.6.16-1.2236_FC6xen0

error seen:
$)-> xm list
Unexpected error: xmlrpclib.ProtocolError

Please report to xen-devel.com
Traceback (most recent call last):
  File "/usr/sbin/xm", line 10, in ?
    main.main(sys.argv)
  File "/usr/lib/python2.4/site-packages/xen/xm/main.py", line 1124, in main
    rc = cmd(args)
  File "/usr/lib/python2.4/site-packages/xen/xm/main.py", line 378, in xm_list
    doms = getDomains(params)
  File "/usr/lib/python2.4/site-packages/xen/xm/main.py", line 351, in getDomains
    return server.xend.domains(1)
  File "/usr/lib/python2.4/xmlrpclib.py", line 1096, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.4/site-packages/xen/util/xmlrpclib2.py", line 83, in
__request
    response = xmlrpclib.ServerProxy.__request(self, methodname, params)
  File "/usr/lib/python2.4/xmlrpclib.py", line 1383, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.4/site-packages/xen/util/xmlrpclib2.py", line 54, in
request
    return Transport.request(self, host, '/RPC2', request_body, verbose)
  File "/usr/lib/python2.4/xmlrpclib.py", line 1137, in request
    headers
xmlrpclib.ProtocolError: <ProtocolError for /RPC2: 500 Internal error>


System was running one fully virtualized guest, domain id 7 (had been running
several earlier tests without error).  Ran `xm list`, which was previously
successful, and the traceback was printed.

Previous guests were killed (usually) with xm destroy, as evidenced by several
installation trees mounted under /var/lib/xen/xenfs.??????

not yet reproduced, I'm giving the guest sufficient time to finish installing
and xenguest-install.py to return.

xenguest-install.py was launched with
['/usr/sbin/xm', 'create', '-c', 'cdrom=/mnt/tests/xen/xm/install/boot.iso',
'boot=d', '/etc/xen/rawhide-fv']

/etc/xen/rawhide-fv:
# Automatically generated xen config file
name = "rawhide-fv"
builder = "hvm"
memory = "400"
uuid = "84ef197f-0dc1-714c-b7e0-60ab32217dbb"
disk = [ 'file:/root/rawhide.img,ioemu:hda,w' ]
vif = [ 'type=ioemu,bridge=xenbr0,mac=00:16:3e:33:9e:8a' ]
on_reboot   = 'restart'
on_crash    = 'restart'
kernel = '/usr/lib/xen/boot/hvmloader'
device_model = '/usr/lib/xen/bin/qemu-dm'
sdl = 0 # use SDL for graphics
vnc = 0 # use VNC for graphics
vncviewer = 0 # spawn vncviewer by default
nographic = 1 # don't use graphics
serial='pty' # enable serial console