Just wanted to add a me too. After upgrading a Xen hypervisor to 4.9.0-7-amd64 I see the same infinite reboot loop as reported above.
As this box is a production server I downgraded back to 4.9.0-6 to fix the issue for now. Thanks, -- System Information: Debian Release: 9.5 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64)
