Hi, if you are running Debian on Xen you should keep your eyes open when upgrading the kernel. For me, the kernel 4.9.110-1 from the linux-image-4.9.0-7-amd64 package wouldn't boot as a DomU kernel. As I've read, it won't work as a Dom0 kernel either (I didn't check that, though).
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903767 -- Regards mks
