I have a Linksys USB ethernet adapter that uses the uax driver. It
shows up as this:

uax0 Linksys USB 2.0 10/100 ethernet controller, rev 2.00/0.01, addr2

I first hooked it up to a via based USB2/Firewire card I have, and I
noticed some errors related to ehci, and the adapter didn't work I
unplugged it and it caused the machine to panic. I didn't write down
the output before the db> prompt, but I have the dump.

I hooked it up to the built in USB controller (USB1, not sure of the
vendor) and it didn't work again, but this time when I unplugged it,
it didn't panic the box.

This is on 2.0.2, generic except for I added firewire support.

I can probably get a little more info if anyone wants to work on this
one. I'm not smart enough to fix it.

Andy