I have verified that by downloading and upgrading to the following kernel the issue is resolved, the issue still exists with 2.6.38-10
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.39-rc4-natty/ I successfully booted from CD on RHEL 5.4 and Centos 5.5 on CD and installed with no issue with 8 cpu's Here is the text of the commit I think fixes the issue. commit 1aa8ceef0312a6aae7dd863a120a55f1637b361d Author: Nikola Ciprich <extmaill...@linuxbox.cz> Date: Wed Mar 9 23:36:51 2011 +0100 KVM: fix kvmclock regression due to missing clock update commit 387b9f97750444728962b236987fbe8ee8cc4f8c moved kvm_request_guest_time_update(vcpu), breaking 32bit SMP guests using kvm-clock. Fix this by moving (new) clock update function to proper place. Signed-off-by: Nikola Ciprich <nikola.cipr...@linuxbox.cz> Acked-by: Zachary Amsden <zams...@redhat.com> Signed-off-by: Avi Kivity <a...@redhat.com> -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/795717 Title: 32bit rhel and centos 5.(5|6) hangs on boot on natty To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/795717/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs