vmbuilder crashed with ioctl in create()

It is reproducible.

I used the following script to create the VMWare:

#!/bin/bash
DESTDIR=/home/wurzlsepp/projects/install/ldap/vmware/generated
CONFIGFILE=/home/wurzlsepp/projects/install/ldap/vmware/ldapvm.cfg
FILESTOCOPY=/home/wurzlsepp/projects/install/ldap/vmware/copy.ini
HOSTNAME=ldap
LOCALE=en_US.UTF-8
RAM=512
CPUS=1
ROOTFILE=4096
SWAPSIZE=1024
DOMAIN=intellicard.ch
HYPERVISOR=esxi
DISTRO=ubuntu

echo "Generating a new VMWare..."
sudo vmbuilder $HYPERVISOR $DISTRO -d $DESTDIR -c $CONFIGFILE -m $RAM --cpus=$CPUS --rootsize=$ROOTFILE --swapsize=$SWAPSIZE --domain=$DOMAIN --copy $FILESTOCOPY --lang=$LOCALE --hostname=$HOSTNAME

The referenced config file looks like this:
[DEFAULT]
user = notuser
name = Notuser
pass = xxxxxxxx
firstlogin = /home/wurzlsepp/projects/install/ldap/guest/kickoff.sh

[ubuntu]
suite = intrepid
flavour = virtual
addpkg = openssh-server, openssh-client

ProblemType: Crash
Architecture: amd64
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/vmbuilder
InterpreterPath: /usr/bin/python2.6
Package: python-vm-builder 0.10-0ubuntu1
PackageArchitecture: all
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python /usr/bin/vmbuilder esxi ubuntu -d /home/wurzlsepp/projects/install/ldap/vmware/generated -c /home/wurzlsepp/projects/install/ldap/vmware/ldapvm.cfg -m 512 --cpus=1 --rootsize=4096 --swapsize=1024 --domain=intellicard.ch --copy /home/wurzlsepp/projects/install/ldap/vmware/copy.ini --lang=en_US.UTF-8 --hostname=ldap
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 LANGUAGE=
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/vmbuilder', 'esxi', 'ubuntu', '-d', '/home/wurzlsepp/projects/install/ldap/vmware/generated', '-c', '/home/wurzlsepp/projects/install/ldap/vmware/ldapvm.cfg', '-m', '512', '--cpus=1', '--rootsize=4096', '--swapsize=1024', '--domain=intellicard.ch', '--copy', '/home/wurzlsepp/projects/install/ldap/vmware/copy.ini', '--lang=en_US.UTF-8', '--hostname=ldap']
SourcePackage: vm-builder
Title: vmbuilder crashed with ioctl in create()
Uname: Linux 2.6.28-8-generic x86_64
UserGroups: