Comment 0 for bug 1891224

We have most reliably reproduced this on a Standard_B1s in Azure in the North Europe region (>80% of the time). Tests in other regions/VM types do not show this failure as often (<1%). We have reproduced this in Xenial, Bionic, Focal, and Groovy. We saw an increase of test failures around a month ago.

From the journal :

Aug 11 09:55:28 ubuntu systemd[1]: sys-devices-virtual-misc-vmbus\x21hv_vss.device: Job sys-devices-virtual-misc-vmbus\x21hv_vss.device/start tim>
Aug 11 09:55:28 ubuntu systemd[1]: Timed out waiting for device sys-devices-virtual-misc-vmbus\x21hv_vss.device.
Aug 11 09:55:28 ubuntu systemd[1]: Dependency failed for Hyper-V VSS Protocol Daemon.
Aug 11 09:55:28 ubuntu systemd[1]: hv-vss-daemon.service: Job hv-vss-daemon.service/start failed with result 'dependency'.
Aug 11 09:55:28 ubuntu systemd[1]: sys-devices-virtual-misc-vmbus\x21hv_vss.device: Job sys-devices-virtual-misc-vmbus\x21hv_vss.device/start fai>
Aug 11 09:55:28 ubuntu systemd[1]: sys-devices-virtual-misc-vmbus\x21hv_fcopy.device: Job sys-devices-virtual-misc-vmbus\x21hv_fcopy.device/start>
Aug 11 09:55:28 ubuntu systemd[1]: Timed out waiting for device sys-devices-virtual-misc-vmbus\x21hv_fcopy.device.
Aug 11 09:55:28 ubuntu systemd[1]: Dependency failed for Hyper-V File Copy Protocol Daemon.

We've seen problems in the past with KVP daemons that looked very similar : https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1820063