The primary errors here seem to imply the device has gone offline at this point:
[ 252.818117] hv_storvsc vmbus_0_15: cmd 0x35 scsi status 0x0 srb status 0x4 Note the srb status == 0x4 which implies the device has had a fatal error while handling the SCSI sync command: #define SYNCHRONIZE_CACHE 0x35 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1369976 Title: [Hyper-V] Fiber Channel Disk Remote I/O error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1369976/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs