Thanks for going through this testing. Based on your results, I looked at the Hyper-V related commits in http://kernel.ubuntu.com/git/ubuntu/ubuntu-trusty.git between 3.13.0-26.48 (GOOD) and 3.13.0-35.62 (BAD).
>From reviewing these commits, there doesn't seem to be an obvious culprit. But it's possible that anyone of the following could affect storage driver behavior. Looking forward to seeing what you uncover in your bisect. - a61e9104ea3b183a3b3cfdaa43145e1cd26b21ff Drivers: hv: vmbus: Negotiate version 3.0 when running on ws2012r2 hosts - c8c38b34f5790366d98306c1fc418ddff1b0357b Drivers: hv: vmbus: Fix a bug in the channel callback dispatch code -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1470250 Title: [Hyper-V] Ubuntu 14.04.2 LTS Generation 2 SCSI Errors on VSS Based Backups To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1470250/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
