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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1496927

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1496927

Title:
  [Hyper-V] udev trying to modify owner and mode of /dev/vmbus/hv_vss

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  While testing Ubuntu 15.10 Wily Werewolf (development branch) 64 bit
  we found the below issue.

  Repro rate: 100%
  Repro details:
  Hyper-V: Server 2012 (no R2) - WS 2012 is the only affected platform
  Daily build version: 2015.09.10
  Kernel: kernel 4.2.0-7-generic

  During the below event, we also noticed that system-udevd is
  constantly around 100% CPU on the VM, taking a lot of cycles.

  On Server 2012 we don't have the Live backup with VSS feature, so
  these messages should not occur in the first place.

  After 20 minutes we have over 3000 messages in the logs, all like below:
  Sep 14 17:43:33 ubuntu systemd-udevd[14292]: setting owner of /dev/vmbus/hv_vss to uid=0, gid=0 failed: No such file or directory
  Sep 14 17:44:00 ubuntu systemd-udevd[14292]: setting mode of /dev/vmbus/hv_vss to 020600 failed: No such file or directory
  Sep 14 17:44:00 ubuntu systemd-udevd[14292]: setting owner of /dev/vmbus/hv_vss to uid=0, gid=0 failed: No such file or directory
  Sep 14 17:44:01 ubuntu systemd-udevd[14292]: setting mode of /dev/vmbus/hv_vss to 020600 failed: No such file or directory

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