[Bug 1047531] [NEW] Ubuntu 12.04 (Precise) guests can't boot on Ubuntu 10.04 (Lucid) QEMU-KVM host

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For a couple of days I'm trying (on and off) to launch Ubuntu 12.04
guest (32-bit) on my 10.04 KVM host (AMD CPU in 32-bit mode with PAE
enabled, stock server kernel). I have tried it with different images
(built with VMBuilder, downloaded from cloud-images.ubuntu.com or even
the installation ISO images of different flavors). They all hang on
boot, either after saying "Starting up ..." or just with a black screen.
Kernel options have no effect, it seems the hang happens in GRUB, before
kernel is launched. I have tried enabling debug in grub and the last
lines I see about loading initrd, malloc and several reallocator.c
traces, then hang.

A simple steps to reproduce:

# wget http://uec-images.ubuntu.com/releases/precise/release-20120822/ubuntu-12.04-server-cloudimg-i386-disk1.img
# qemu-img convert -O qcow2 ubuntu-12.04-server-cloudimg-i386-disk1.img moa.qcow2
# kvm -m 512 -smp 1 -drive file=./moa.qcow2 -vnc 127.0.0.1:10

In attached vnc client this briefly displays GRUB prompt and hangs with
black screen.

The same happens without image conversion step, that is
# kvm -m 512 -smp 1 -drive file=./ubuntu-12.04-server-cloudimg-i386-disk1.img -vnc 127.0.0.1:10

At the same time, the host perfectly runs about 10 Lucid guests, so this
should not be a host configuration problem.

** Affects: qemu-kvm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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Ubuntu 12.04 (Precise) guests can't boot on Ubuntu 10.04 (Lucid) QEMU-KVM host
https://bugs.launchpad.net/bugs/1047531
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