** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-power-systems
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
** Changed in: ubuntu-power-systems
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/1867109
Title:
[UBUNTU 20.04] virtio-blk hw queue gets possibly permanently stopped
when swiotlb full
Status in The Ubuntu-power-systems project:
New
Status in linux package in Ubuntu:
New
Bug description:
virtio-blk disks can go dissfunctional when swiotlb fills up
For example, with a PV guest choose a small swiotlb (30MB) and create IO load
on several virtio-blk disks simultaneously. It actually should not matter what
causes the swiotlb pressure (can be virtio-net as well).
Fixes posted upstream:
https://lkml.org/lkml/2020/2/13/306
We will need backports to support Protected Virtualization.
IBM verified that the patches apply cleanly on focal/master-next,
upstream commit ids for reference:
commit bab7e6f05699a481787f7659c4f766dd87187dae
Author: Halil Pasic <[email protected]>
Date: Thu Feb 13 13:37:27 2020 +0100
virtio-blk: fix hw_queue stopped on arbitrary error
commit 24506976aec92052e9fe328146a2e574a1190986
Author: Halil Pasic <[email protected]>
Date: Thu Feb 13 13:37:28 2020 +0100
virtio-blk: improve virtqueue error to BLK_STS
Also applies cleanly on 19.10.....
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