panic on r255948 after inserting a 2nd USB device

[Matthias Apitz]

Hello,

I have an 10-CURRENT r255948 i386 which is booted from an USB stick;
no disk or SSD is involved; it boots fine and works fine mostly;

sometimes right after boot, when I plug-in another USB device 
(a HUAWEI UMTS stick) the system reports:

ugen4.4 <HUAWEI Technology> at usbus4
(da0:umass-sim0:0:0:0) WRITE(10). CDB: 2a 00 01 b7 14 07 00 00 08 00
(da0:umass-sim0:0:0:0) CAM status: CCB request completed with an error
(da0:umass-sim0:0:0:0) Retrying command
ugen4.4 <HUAWEI Technology> at usbus4 (disconnected)
(da0:umass-sim0:0:0:0) WRITE(10). CDB: 2a 00 01 b7 14 07 00 00 08 00
(da0:umass-sim0:0:0:0) CAM status: CCB request completed with an error
(da0:umass-sim0:0:0:0) Retrying command
...

and so far until PANIC; the da0 is the booted USB key.

This does not happen always on lug-in of the UMTS stick, only let's
say every second time.

Anything I could do? Thx

	matthias

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