new FreeBSD kernel failed to load mobile disk

[+a-#+3-d+c-v+:-.+@-=+w-x@s@d@e@x@g@h@p@k]

I rebuilt the FreeBSD 10.0 kernel, found it can't load my mobile disk:

(da0:umass-sim0:0:0:0): ATA COMMAND PASS THROUGH(16). CDB: 85 0
8 0a 00 00 02 00 00 00 00 00 00 00 40 ec 00
(da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error
(da0:umass-sim0:0:0:0): Retrying command

The shutdown will be paused by it. When I pull out the mobile disk,
the computer is shutdown normally.

This is the information when I insert the disk:

ugen0.4: <vendor 0x05e3> at usbus0
umass0: <vendor 0x05e3 USB Storage, class 0/0, rev 2.00/0.09, addr 4> on usbus0
umass0:  SCSI over Bulk-Only; quirks = 0x4100
umass0:4:0:-1: Attached to scbus4
xpt_release_devq(): requested 1 > present 0
da0 at umass-sim0 bus 0 scbus4 target 0 lun 0
da0: <WDC WD50 00BPVT-24HXZT3 0009> Fixed Direct Access SCSI-0 device
da0: 40.000MB/s transfers
da0: 476940MB (976773164 512 byte sectors: 255H 63S/T 60801C)