Seems to be solved 

Forum: PCMCIA Installation and Configuration Issues
Re: lock up with message "kmem_alloc: Bad slab magic (...)" after insmoding pcmcia_core (Tim Johann)
Date: 2000, Feb 11
From: David Hinds <dhinds@pcmcia.sourceforge.org>

This appeared to be due to use of an older (3.1.3) PCMCIA driver release, and is fixed in current drivers. -- Dave

to: "Seems to be solved"