5.0.1 panics on USB wireless device

[Davide Marini <dmarini%MIT.EDU@localhost>]

Dear All:

My desktop is running a 5.0.1 AMD64 fresh installation.  Generic kernel.

Upon connecting a Belkin USB Wireless key, the device is correctly
recognized and the rum0 node is created.

Issuing a:

# wpa_supplicant -B -i rum0 -c /etc/wpa_supplicant.conf

results, after 30-60 seconds in a complete hang of the machine.
The console shows a series of numbers, 7500 7499 7488 ... etc.
Machine becomes completely unresponsive and the only solution is a hard
power-off.  I can reproduce it, but it takes 20 min of file system checks
on next reboot.

wpa_supplicant.conf:

network={
        ssid="MyNetwork"
        psk="password"
}

Am I doing something wrong??

Thank you very much in advance for your help!

Regards,
Davide