Upgrading the host from xenial's QEMU to zesty's QEMU seems to fix it. I
can do several reboots of zesty w/o a hang.

** Changed in: edk2 (Ubuntu)
       Status: New => Invalid

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

** Changed in: grub2 (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1675522

Title:
  arm64: Synchronous Exception at 0x00000000BBC129BC

Status in edk2 package in Ubuntu:
  Invalid
Status in grub2 package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in qemu package in Ubuntu:
  New

Bug description:
  I installed a KVM VM with the zesty beta server ISO. The install went
  well but, upon reboot, GRUB entered a Synchronous Exception loop after
  selecting the Ubuntu boot option.

  After killing qemu-system-aarch64 and restarting the VM, the system
  booted to a prompt w/o issue.

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