The warnings on this page are really important.
If you ever end up with a Segmentation Fault (core dump 11), and have something similar to this in your stack trace:
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0 0x0000000805936da2 in hash_lookup (hashtab=0x8099ad600, key=0x7fffffffe590 "1:3\b\b") at misc.c:349
349 misc.c: No such file or directory.
in misc.c
[New Thread 8016041c0 (LWP 100388)]
#0 0x0000000805936da2 in hash_lookup (hashtab=0x8099ad600, key=0x7fffffffe590 "1:3\b\b") at misc.c:349
ret = Variable "ret" is not available.