https://bugs.freedesktop.org/show_bug.cgi?id=98901
--- Comment #3 from Mateusz Zalega msgctl@centzontotochtin.org --- (In reply to Alex Deucher from comment #1)
Can you try a more recent kernel? 4.8 or 4.9?
I added a DomU startup log from a 4.9 series kernel. The result is the same in 4.8.