After upgrading HWE-16.04-kernel from 4.15.0-48 to 4.15.0-50 the kernel crashes while booting as PVH-Guest with Xen 4.12. Kernel 4.15.0-48 and prior did boot without any problems.
We have the same problem for Ubuntu 18.04 with Kernel 4.15.0-50. Ubunutu 18.04 with HWE-Kernel 4.18.0-20 boots without problems as PVH-DomU.
After upgrading HWE-16.04-kernel from 4.15.0-48 to 4.15.0-50 the kernel crashes while booting as PVH-Guest with Xen 4.12. Kernel 4.15.0-48 and prior did boot without any problems.
We have the same problem for Ubuntu 18.04 with Kernel 4.15.0-50. Ubunutu 18.04 with HWE-Kernel 4.18.0-20 boots without problems as PVH-DomU.
See also https:/ /lists. xenproject. org/archives/ html/xen- users/2019- 05/msg00010. html