So I can confirm the behavior with a local Xen Server and a HVM Xenial guest. While the current proposed 4.4 kernel crashes while setting up the acpi interrupt, this does not happen with a 4.15 kernel from proposed on a Bionic HVM guest. Still I was able to get the 4.4 kernel to boot by reverting the following patch. Despite it being applied to 4.4 and 4.15 proposed. So it sounds like something outside the scope of the patch itself that changed between 4.4 and 4,15 is causing the problems.
commit 110e8369be2953ee2d3f7fd00d66034daa4c695c Author: Thomas Gleixner <t...@linutronix.de> Date: Tue Aug 25 17:22:58 2020 +0200 XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt XEN data pointer which contains XEN specific information. BugLink: https://bugs.launchpad.net/bugs/1895031 commit c330fb1ddc0a922f044989492b7fcca77ee1db46 upstream. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1896725 Title: xenial 4.4.0-191-generic in -proposed has a regression To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1896725/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs