freebsd 8.0 release usb

Hello  All,


today i have upgrade my workstation from 7.2-release to 8.0-release with 
"freebsd-upgrade"
and i wanted to test usb.
For that i mount a USB stick and without umount remove them.

And my workstation is dead.
I can not write  on the consolle , and i must be reset the workstation

Nov 24 17:19:10 moon root: Unknown USB device: vendor 0x1307 product 
0x0163 bus uhub2
Nov 24 17:19:10 moon kernel: ugen2.2: <USBest Technology> at usbus2
Nov 24 17:19:10 moon kernel: umass0: <USBest Technology USB Mass Storage 
Device, class 0/0, rev 2.00/1.00, addr 2> on usbus2
Nov 24 17:19:10 moon kernel: umass0:  SCSI over Bulk-Only; quirks = 0x0000
Nov 24 17:19:12 moon kernel: umass0:0:0:-1: Attached to scbus0
Nov 24 17:19:12 moon kernel: da0 at umass-sim0 bus 0 target 0 lun 0
Nov 24 17:19:12 moon kernel: da0: <Ut163 USB2FlashStorage 0.00> 
Removable Direct Access SCSI-2 device
Nov 24 17:19:12 moon kernel: da0: 40.000MB/s transfers
Nov 24 17:19:12 moon kernel: da0: 490MB (1003520 512 byte sectors: 64H 
32S/T 490C)
Nov 24 17:19:12 moon kernel: GEOM: da0: partition 1 does not start on a 
track boundary.
Nov 24 17:19:12 moon kernel: GEOM: da0: partition 1 does not end on a 
track boundary.
Nov 24 17:19:31 moon kernel: ugen2.2: <USBest Technology> at usbus2 
(disconnected)
Nov 24 17:19:31 moon kernel: umass0: at uhub2, port 3, addr 2 (disconnected)
Nov 24 17:19:31 moon kernel: (da0:umass-sim0:0:0:0): lost device
Nov 24 17:19:31 moon kernel: (da0:umass-sim0:0:0:0): Synchronize cache 
failed, status == 0xa, scsi status == 
0x0                                                                     
Nov 24 17:19:31 moon kernel: (da0:umass-sim0:0:0:0): removing device entry
Nov 24 17:19:40 moon kernel: g_vfs_done():da0s1[WRITE(offset=512, 
length=4096)]error = 6
Nov 24 17:19:55 moon login: ROOT LOGIN (root) ON ttyv1
Nov 24 17:21:58 moon console-kit-daemon[1262]: WARNING: Error waiting 
for native console 3 activation: Device not configured
Nov 24 17:22:09 moon kernel: acpi0: suspend request ignored (not ready yet)
Nov 24 17:22:09 moon kernel: acpi0: request to enter state S5 failed (err 6)


what can i do ?

i know not remove the stick without umount !
but i do this bad things only for test.



Thenks much!