Hangs on USB flash reader

[Anders Nordby]

Hi,

I write data to some CF cards now and then. After a few iterations, dd
starts hanging instead of writing to the device. I am running FreeBSD
6.0-RELEASE and I use Compact Flash cards in a eMagic USB 2.0 6-in-1
card reader.

The flash reader is identified by usbdevs as:

 port 3 addr 2: high speed, power 500 mA, config 1, Flash
Reader(0x0760), vendor 0x05e3(0x05e3), rev 1.25

Some console messages:

Jan 16 18:12:44 lappy kernel: umass0: vendor 0x05e3 Flash Reader, rev
2.00/1.25,
 addr 2               
Jan 16 18:12:44 lappy kernel: umass0: SCSI over Bulk-Only; quirks =
0x0000     
Jan 16 18:12:44 lappy kernel: umass0:2:0:-1: Attached to scbus2                 
Jan 16 18:12:45 lappy kernel: da0 at umass-sim0 bus 0 target 0 lun 0            
Jan 16 18:12:45 lappy kernel: da0: <Generic STORAGE DEVICE 0125>
Removable Direc
t Access SCSI-0 device
Jan 16 18:12:45 lappy kernel: da0: 40.000MB/s transfers
Jan 16 18:12:45 lappy kernel: da0: 123MB (251904 512 byte sectors: 64H
32S/T 123
C)
Jan 16 18:12:45 lappy kernel: da1 at umass-sim0 bus 0 target 0 lun 1
Jan 16 18:12:45 lappy kernel: da1: <Generic STORAGE DEVICE 0125>
Removable Direc
t Access SCSI-0 device
Jan 16 18:12:45 lappy kernel: da1: 40.000MB/s transfers          
Jan 16 18:12:45 lappy kernel: da1: Attempt to query device size failed:
NOT READ
Y, Medium not present
Jan 16 18:12:45 lappy kernel: da2 at umass-sim0 bus 0 target 0 lun 2         
Jan 16 18:12:45 lappy kernel: da2: <Generic STORAGE DEVICE 0125>
Removable Direc
t Access SCSI-0 device
Jan 16 18:12:45 lappy kernel: da2: 40.000MB/s transfers
Jan 16 18:12:45 lappy kernel: da2: Attempt to query device size failed:
NOT READ
Y, Medium not present
Jan 16 18:12:45 lappy kernel: da3 at umass-sim0 bus 0 target 0 lun 3         
Jan 16 18:12:45 lappy kernel: da3: <Generic STORAGE DEVICE 0125>
Removable Direc
t Access SCSI-0 device
Jan 16 18:12:45 lappy kernel: da3: 40.000MB/s transfers
Jan 16 18:12:45 lappy kernel: da3: Attempt to query device size failed:
NOT READ
Y, Medium not present
Jan 16 18:12:45 lappy kernel: (da0:umass-sim0:0:0:0): Synchronize cache
failed,
status == 0x10, scsi status == 0x0
Jan 16 18:12:45 lappy kernel: umass0: Invalid CSW: tag 55 should be 56   

Anyone else run into this sort of thing? If writing to a CF card hangs
once, it seems I need a reboot to recover (rebooting hangs too, in the
end). Sometimes I can write one card, sometimes more.

Regards,

-- 
Anders.