I am also have this problem on FC6 with:

Name   : autofs
Arch   : i386
Epoch  : 1
Version: 5.0.1
Release: 0.rc3.33

I **believe** the core dumps started after I updated to this version but 
can't be sure about that.  I also can supply a core dump if you post 
where to send it.

Additionally, I am using autofs in conjunction with LDAP.

Robert Kuropkat