I just had my kernel panic due to what I believe is a usb error (ie the aue
failures are just a result of the usb failing):

Oct 14 03:17:57 router /netbsd: aue0: watchdog timeout
Oct 14 03:17:57 router /netbsd: usb_insert_transfer: xfer=0xd0025000 not
busy 0x4f4e5155
Oct 14 03:17:57 router /netbsd: aue0: aue_send error=INVAL

The aue0 device is a Siemens SpeedStream usb ethernet adapter. This error
dropped me to debug prompt and I rebooted.  If it happens again and you want
me to get more info once in the debugger let me know as I'm not sure what
information would be helpful.  The machine is an iBook running:

NetBSD router 1.6I NetBSD 1.6I (GENERIC) #0: Mon Oct  7 23:16:35 PDT 2002

Thanks, Dan.