just a few minutes ago this happened:

Oct  4 21:12:16 router /netbsd: aue0: 1 usb errors on intr: IOERROR
Oct  4 21:12:21 router /netbsd: aue0: 1 usb errors on intr: IOERROR
Oct  4 21:12:37 router /netbsd: aue0: watchdog timeout
Oct  4 21:12:38 router /netbsd: usb_insert_transfer: xfer=0xe0041600 not
busy 0x4f4e5155
Oct  4 21:12:38 router /netbsd: aue0: aue_send error=INVAL
Oct  4 21:12:38 router /netbsd: ohci_abort_xfer: hcpriv is NULL
Oct  4 21:13:09 router last message repeated 221 times
Oct  4 21:15:10 router last message repeated 864 times

Might be related or might be a completely different problem, not sure.

Dan

P.S. Unlike the other error, this one rendered the interface dead (ie not
sending or receiving packets) until I rebooted.