Description of problem:

An HVM guest created (and working) yesterday now cannot be booted because of an
apparent memory allocation error (there is plenty of free memory).

Version-Release number of selected component (if applicable):

libvirt-0.2.2-4.fc7
virt-manager-0.4.0-2.fc7
xen-3.1.0-0.rc7.4.fc7

(The latter is my own build of xen - it is the same as the xen .1 RPM with the
patch to fix bug 240009).

How reproducible:

Always

Steps to Reproduce:
1. Double click on the guest
2. Click 'Run' button
  
Actual results:

In xend-debug.log:

Failed allocation for dom 8: 127808 extents of order 0
ERROR Internal error: Could not allocate memory for HVM guest.
 (16 = Device or resource busy)

In xend.log:

[2007-05-16 09:06:25 3680] ERROR (SrvBase:88) Request start failed.
Traceback (most recent call last):
  File "/usr/lib64/python2.5/site-packages/xen/web/SrvBase.py", line 85, in perf
orm
    return op_method(op, req)
  File "/usr/lib64/python2.5/site-packages/xen/xend/server/SrvDomain.py", line 7
7, in op_start
    return self.xd.domain_start(self.dom.getName(), paused)
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendDomain.py", line 994, in
 domain_start
    dominfo.start(is_managed = True)
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", line 396
, in start
    XendTask.log_progress(31, 60, self._initDomain)
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendTask.py", line 209, in l
og_progress
    retval = func(*args, **kwds)
  File "/usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", line 158
9, in _initDomain
    raise VmError(str(exn))
VmError: (1, 'Internal error', 'Could not allocate memory for HVM guest.\n (16 =
 Device or resource busy)')

In the error window:

Unable to start virtual machine '<class 'libvirt.libvirtError'> virDomainCreate(
) failed POST operation failed: (xend.err "(1, 'Internal error', 'Could not allo
cate memory for HVM guest.\\n (16 = Device or resource busy)')")
Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/console.py", line 348, in control_vm
_run
    self.vm.startup()
  File "/usr/share/virt-manager/virtManager/domain.py", line 361, in startup
    self.vm.create()
  File "/usr/lib64/python2.5/site-packages/libvirt.py", line 194, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: virDomainCreate() failed POST operation failed: (xend.err "(1, 'In
ternal error', 'Could not allocate memory for HVM guest.\\n (16 = Device or reso
urce busy)')")
'

Expected results:

Guest boots.

Additional info: