I can confirm I have this issue as well on 14.04 and 16.04 with the
latest kernel.
Removing the DVD drive does fix the issue, however if they are online it
also causes the VMs to run out of memory, same as if they are being
backed up.
I used the following PowerShell script to remove all drives on the
Hyper-V host:
foreach ($VM in Get-VM) {
Get-VMDvdDrive -VMName $VM.Name | Remove-VMDvdDrive
}
I also noticed that instead of removing the DVD drive you can disable
the Backup (volume checkpoint) integration service and it will allow
backups to complete.
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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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