You can use gdb to debug perl. It is not ideal, but when you have core dumps it should help.

# start gdb
gdb /usr/bin/perl
# inside gdb run the script
run script.pl  
# after it segv's get the stack trace
bt
[download]

You can inspect the c data that was in memory at the time of the segv and probably figure out what caused the core dump. See the gdb man page for more details.