Comment 7 for bug 946022

I have a similar problem trying to launch any Ubuntu 12.04 Precise guest (built with VMBuilder, downloaded from cloud-images.ubuntu.com or even the installation ISO images of different flavors) on 10.04 Lucid host. This is unaffected by different kernel options (lapic, acpi_pm etc) and, it seems, happens before the kernel starts. I have tried enabling debug in grub and the last lines I see about loading initrd, malloc and several reallocator.c traces, then hang.

When hanged, the kvm uses very little memory (about 30 mb) and spins, consuming 100% CPU.

What is strange that, at the same time, the host perfectly runs about 10 Lucid guests.