ttyp0:makoto@bologna 1:40:24/081115(...x11/modular-xorg-server)> sudo gdb /usr/sbin/pkg_info pkg_info.core
GNU gdb 6.5
...  (omiitted) ...
Loaded symbols for /usr/libexec/ld.elf_so
Core was generated by `pkg_info'.
Program terminated with signal 11, Segmentation fault.
#0  0x01804540 in var_get_memory ()
(gdb) bt
#0  0x01804540 in var_get_memory ()
#1  0x018036e0 in show_var ()
#2  0x01802b04 in pkg_do ()
#3  0x01803594 in pkg_perform ()
#4  0x01802328 in main ()
(gdb) 

This is just due to a /var/db/pkg/pixman is corrupted.

pkg_info

....
xkeyboard-config-1.4 X Keyboard Configuration Database
MesaLib-7.0.4.1nb4  Graphics library similar to SGI's OpenGL
pixman-0.12.0       UU;;..