Vconfig, ifconfig and Debian. Somethings goes wrong

Hi all,

I'm experiencing with this problem. I've got a debian sarge on a server
with only one NIC. NIC is an intel 100, driver eepro100.

I've downloaded vlan package.

Run:

vconfig add eth0 2

Next, i've run a simple 'ifconfig'. Here commands freezes. Console seems
to be locked. No CTRL+C working. Not possibile to kill with 'kill -9 '.

No possible to solve, only reboot.

This occurs with two diffrent server....maybe a bug?
Kernel is 2.6.8-2-686.

Thanks
Stefano