Hi. I have recently upgraded to 2.4.18+pci hotplug (the rest of the 
system is mostly Slackware 8.1).
I can do multiple eject and insert with 2.2.17+pcmcia on the same 
laptop+cards before the upgrade
so I think it is a problem with the pci hotplug sub-system.

The curious thing is, when the kernel oops, most of the system still 
seems functional, it still write to
syslog, etc and switching virtual desktop in the window manager (fvwm2) 
still works, I can still
launch mozilla web-surf for hours and everything that only requires the 
mouse; i.e. the keyboard just
seems to go dead. I can do 'exec xterm -e top' (one of the fvwm menu 
items), and the only indication
(other than the fact that I can't do a thing with the keyboard) that 
there is a problem is a
"keventd <defunc>"  entry in top. So one of the approach for debugging 
this might be to
add an "xterm -e script" entry to my fvwm menu if I know what to put 
inside 'script'.

The 2.4.18 kernel was compiled with gcc 2.95.3. I have two cardbus cards 
(SlimSCSI 1480A
and a 3com 575 - it uses the 3x59x module anyway). I normally leave the 
ethernet card in
and plug and unplug the scsi card which connects to an external CD 
writer, so I only
ever notice when I try to use the scsi card a 2nd time; but I tried 
having the scsi in at boot time,
took it out (cardctl eject 0, then modprobe -r aic7xxx), and insert the 
3com in, and it oops'ed.