Seems to be FIXED, tested linux-image-4.4.0-62-generic/xenial-proposed. I could not reproduce the hang with the version 4.4.0-62.83 from xenial- proposed, so I assume the issue has been fixed. I confirm that I am able to boot nested VMs with the kernel above from 4.4 release.
root@bug-147569:~# uname -a Linux bug-147569 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:09:19 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux -- Installed with: apt-get install linux-image-4.4.0-62-generic/xenial-proposed linux-image-4.4.0-62-generic is already the newest version (4.4.0-62.83). Selected version '4.4.0-62.83' (Ubuntu:16.04/xenial-proposed [ppc64el]) for 'linux-image-4.4.0-62-generic' ** Tags removed: verification-needed-xenial ** Tags added: verification-done-xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1634129 Title: Couldn't emulate instruction 0x7813427c To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1634129/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs