Symbol: VTSCSI_REQ_STATE_FREE
sys/dev/virtio/scsi/virtio_scsi.c
1287
if (to_req->vsr_state == VTSCSI_REQ_STATE_FREE)
sys/dev/virtio/scsi/virtio_scsi.c
2147
req->vsr_state = VTSCSI_REQ_STATE_FREE;