[Bug 1891224] Re: [Hyper-V] VSS and File Copy daemons intermittently fails to start

[Kai-Heng Feng]

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
   [Hyper-V] VSS and File Copy daemons intermittently fails to start

Status in linux package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  New

Bug description:
  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

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