freebsd stable - Jan 2008 - Unable to get crash dump with 7-PRERELEASE - rum0 wireless usb

Using a Hawking HWUG1 with rum0 running FreeBSD 7-PRERELEASE cvsup'd to
releng_7 on 1-27-08.

rum0: <Ralink 802.11 bg WLAN, class 0/0, rev 2.00/0.01, addr 3> on uhub5
rum0: MAC/BBP RT2573 (rev 0x2573a), RF RT2528
rum0: Ethernet address: 00:0e:3b:08:d0:e6
rum0: if_start running deferred for Giant

When the machine is booted rum0 immediately connects to an access point.

Within a few seconds of starting a file xfer there is a page fault.

The last line on the console reads:

Dumping 78 MB :

In /etc/rc.conf:

dumpdev="/dev/ad2s1b"

There doesn't appear to be a core file generated in /var/crash

Any help here is greatly appreciated

-kim