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[Mario <mario@xxxxxxxxxxx>]

I am experiencing this randomly with a host on ubuntu 12.04 and
upgrading guests from 12.04 to 14.04... randomly machines never boot
after the upgrade... others do..

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https://bugs.launchpad.net/bugs/1047531

Title:
  Ubuntu 12.04 (Precise) guests can't boot on Ubuntu 10.04 (Lucid) QEMU-
  KVM host

Status in linux package in Ubuntu:
  Confirmed
Status in qemu-kvm package in Ubuntu:
  Confirmed

Bug description:
  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.

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