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[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
wily' to 'verification-done-wily'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-wily

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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:
  Fix Released
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Released

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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