In your kvm command line above, it says "file=/var/lib/libvirt/images/LinuxISOs/ubuntu-8.04-server-i386.iso". So I'm guessing its at least not the exact log that failed (since you mention centos 5.5 and 5.6).
Also when the guest crashes, could you get a dmesg ? -- 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