CAM_REQ_CMP_ERR

[grarpamp]

I get a lot of these. Searching doesn't say much about them.
What do they mean?
A user data corruption error?
 (Seems to happen at random locations, so I doubt this.)
Can I bump the retry count somehow?
 (kern.cam.da.retry_count  does not seem to do this.)
Thanks.

cam.h: CAM_REQ_CMP_ERR, /* CCB request completed with an error */
8 STABLE r269631

kernel: (da0:umass-sim0:0:0:0): Request completed with CAM_REQ_CMP_ERR
kernel: (da0:umass-sim0:0:0:0): Retrying command
...
kernel: (da0:umass-sim0:0:0:0): Request completed with CAM_REQ_CMP_ERR
kernel: (da0:umass-sim0:0:0:0): Error 5, Retries exhausted

ugen3.2: <MAKE> at usbus3
umass0: <MAKE MODEL, class 0/0, rev 2.00/0.00, addr 2> on usbus3
umass0:  SCSI over Bulk-Only; quirks = 0x4100
umass0:3:0:-1: Attached to scbus3
(probe0:umass-sim0:0:0:0): Down reving Protocol Version from 2 to 0?
pass2 at umass-sim0 bus 0 scbus3 target 0 lun 0
pass2: <MAKE MODEL 2.00> Removable Direct Access SCSI-0 device
pass2: Serial Number num
pass2: 40.000MB/s transfers
GEOM: new disk da0
da0 at umass-sim0 bus 0 scbus3 target 0 lun 0
da0: <MAKE MODEL 2.00> Removable Direct Access SCSI-0 device
da0: Serial Number num
da0: 40.000MB/s transfers
da0: sizeMB (count 512 byte sectors: 64H 32S/T sizeC)
da0: quirks=0x2<NO_6_BYTE>
da0: Delete methods: <NONE(*)>