That is not so strange
PCMCIA driver development
kernel panic unloading pcmcia tools (Pedro Alves)
Report it to the vendor? (David Hinds)
Untitled (Pedro Alves)
Date: 2000, Mar 28
From: David Hinds <email@example.com>
Lots of stuff happens after you "ifconfig" the interface. Until you
do that, most of the driver is inactive. So if the bug is in the
driver shutdown code, you may not see it unless the driver has been
fully activated by running "ifconfig".
to: "That is not so strange"