The following commit has been in Xenial updates for a few versions:
 scsi: storvsc: Workaround for virtual DVD SCSI version


If folks are still hitting this bug, then that commit is not the fix.  We 
should probably perform a bisect to identify the commit that introduced this 
bug.  Before starting this bisect, it would be good to know if this bug is 
already fixed in upstream 4.4 stable or mainline.  Can the following two 
kernels be tested:

4.4.71: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.71/
4.12-rc4: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.12-rc4

** Changed in: linux (Ubuntu)
       Status: Fix Committed => In Progress

** Changed in: linux (Ubuntu Xenial)
       Status: Fix Released => In Progress

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https://bugs.launchpad.net/bugs/1679898

Title:
  [Hyper-V] Ubuntu VM crash during Hyper-V backup or live migration
  after installing kernel 4.4.0-72

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