Some interesting additional observations. I'm running kernel 4.2.0-35 on
15.10 ubuntu. Last night it hung with readonly system ala- this report.
What was interesting was that the machine that hung was NOT included in
the backups run on the host system. The host hypervisor does run backups
on other virtual hosts, as well as some subdirectories on the same
physical disk where the virtual machines vhdx file reside, but not on
the now hung virtual machine.

Even thou it's not included in the backup, it will still FREEZE and THAW
using the VSS service on the virtual machine. Thus it's not even safe to
exclude the machines from backup.

I was able to recover the machine after a reboot after a automatic fsk
correction.

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https://bugs.launchpad.net/bugs/1470250

Title:
  [Hyper-V] Ubuntu 14.04.2 LTS Generation 2 SCSI Errors on VSS Based
  Backups

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