@Serge, Let me know what else we could try to diagnose this problem.
This is the same VM machine created via vmbuilder with LVM volumes: lvcreate -L26G -n vm5 virtualvg vmbuilder.partition root 20000 swap 6000 boot.sh # Install openssh-server apt-get update apt-get install -qqy --force-yes openssh-server vmbuilder kvm ubuntu \ --suite=precise \ --flavour=virtual \ --arch=amd64 \ --mem=512 \ --hostname=vm5 \ --bridge=br0 \ --mirror=http://de.archive.ubuntu.com/ubuntu \ -o --libvirt=qemu:///system \ --ip x.x.x.x \ --mask x.x.x.x \ --net x.x.x.x \ --bcast x.x.x.x \ --gw x.x.x.x \ --dns 8.8.8.8 \ --part=/var/lib/libvirt/images/vm5/vmbuilder.partition \ --raw=/dev/mapper/virtualvg-vm5 \ --templates=/var/lib/libvirt/images/kvm-custom-temp \ --user=tuser \ --name=Temp User \ --pass=xxx \ --addpkg=vim-nox \ --addpkg=acpid \ --firstboot=/var/lib/libvirt/images/vm5/boot.sh \ 2>&1 | tee vmbuilder-install-lvm-based-log.txt The VM hangs taking 100% CPU! There is screenshot: ** Attachment added: "KVM-lvm-based-VM-takes-100CPU.png" https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1029889/+attachment/3398044/+files/KVM-lvm-based-VM-takes-100CPU.png -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu-kvm in Ubuntu. https://bugs.launchpad.net/bugs/1029889 Title: LVM Based KVM VM taking 100% CPU on first start and hangs. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1029889/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs