amusing stumble for the 6 to 10 byte checking code

[mjacob at freebsd.org]

This caught my eye this morning:


(da0:isp1:0:0:0): WRITE(06). CDB: a 8 68 90 80 0
(da0:isp1:0:0:0): CAM Status: SCSI Status Error
(da0:isp1:0:0:0): SCSI Status: Check Condition
(da0:isp1:0:0:0): UNIT ATTENTION asc:29,1
(da0:isp1:0:0:0): Power on occurred
(da0:isp1:0:0:0): Retrying Command (per Sense Data)
(da0:isp1:0:0:0): READ(6)/WRITE(6) not supported, increasing
minimum_cmd_size to
  10.
(da0:isp1:0:0:0): WRITE(10). CDB: 2a 0 0 8 68 90 0 0 80 0
(da0:isp1:0:0:0): CAM Status: SCSI Status Error
(da0:isp1:0:0:0): SCSI Status: Check Condition
(da0:isp1:0:0:0): ILLEGAL REQUEST asc:24,0
(da0:isp1:0:0:0): Invalid field in CDB
(da0:isp1:0:0:0): Unretryable error

I'm still trying to figure out what happened here. Anyone else seen 
this?