It looks like there is a race condition and the corruption occurs when the FREEZE happens to late. No wonder as it's happening from userland.
Mar 16 15:06:49 emsi-02 kernel: [422953.038989] sd 2:0:0:0: [storvsc] Sense Key : Unit Attention [current] Mar 16 15:06:49 emsi-02 kernel: [422953.039003] sd 2:0:0:0: [storvsc] Add. Sense: Changed operating definition Mar 16 15:06:49 emsi-02 kernel: [422953.039058] sd 2:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters. Mar 16 15:06:49 emsi-02 kernel: [422953.039063] blk_update_request: I/O error, dev sda, sector 0 Mar 16 15:06:49 emsi-02 Hyper-V VSS: VSS: op=FREEZE: succeeded Mar 16 15:06:49 emsi-02 kernel: [422953.072223] sd 2:0:0:0: [storvsc] Sense Key : Unit Attention [current] Mar 16 15:06:49 emsi-02 kernel: [422953.072235] sd 2:0:0:0: [storvsc] Add. Sense: Changed operating definition Mar 16 15:06:49 emsi-02 kernel: [422953.072242] sd 2:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters. Mar 16 15:06:49 emsi-02 Hyper-V VSS: VSS: op=THAW: succeeded -- 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
