confirm the bug. workaround with ext3 like in comment #20 works for me:
uname -a
Linux testlab-3 3.2.0-60-generic #91-Ubuntu SMP Wed Feb 19 03:54:44 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
root@testlab-3:~# grep filesystem
/usr/share/pyshared/VMBuilder/plugins/ubuntu/karmic.py
preferred_filesystem = 'ext3'
/usr/bin/vmbuilder kvm ubuntu -v --suite=precise
--libvirt=qemu:///system --flavour=server --arch=amd64 --cpus=2
--mem=12288 --swapsize=2048 --rootsize=50480 --ip=10.0.0.222
--hostname=devstack --user=stack --name=stack --pass=stack --addpkg=git
--addpkg=screen --addpkg=vim --addpkg=strace --addpkg=lsof --addpkg=nmap
--addpkg=git --addpkg=acpid --addpkg=tcpdump --addpkg=python-pip
--addpkg=wget --addpkg=htop --mirror=http://at.archive.ubuntu.com/ubuntu
--components='main,universe' --addpkg=openssh-server --dns=8.8.8.8
--bridge br0
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https://bugs.launchpad.net/bugs/946022
Title:
KVM Guest Hangs at Booting from hard disk
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