FWIW, I've seen this happen, too, basically since I upgraded to Trusty, I believe. Only ever happens on VMs, never on physical machines. All my virtual disks use Virtio, cache mode 'none' (yeah, I know), I/O mode 'native', with raw LVM volumes as backend.
FWIW, I've seen this happen, too, basically since I upgraded to Trusty, I believe. Only ever happens on VMs, never on physical machines. All my virtual disks use Virtio, cache mode 'none' (yeah, I know), I/O mode 'native', with raw LVM volumes as backend.