** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Status: New => Triaged
** Changed in: ubuntu-z-systems
Importance: Undecided => High
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
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https://bugs.launchpad.net/bugs/1818854
Title:
[Ubuntu] vfio-ap: add subsystem to matrix device to avoid libudev
failures
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
New
Bug description:
---Problem Description---
The vfio-ap driver will create a matrix device in sysfs without a subsystem
link. This triggers failures in libudev that might also lead to libvirt errors
(e.g. see
https://www.redhat.com/archives/libvir-list/2019-February/msg00837.html)
The proper fix is to add a subsystem link (e.g. by providing a dummy
bus).
A fix for that is upstream in master branch already for kernel 5.1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=36360658eb5a6cf04bb9f2704d1e4ce54037ec99
This need to be applied to Bionic, Cosmic and Disco
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