Tested with gdb from pkg, gdb in base, and no gdb.
```
savecore: reboot after panic: kdb_sysctl_panic
Apr 20 07:34:12 chevy savecore: reboot after panic: kdb_sysctl_panic
savecore: writing core to /var/crash/vmcore.1
Writing crash summary to /var/crash/core.txt.1.
# grep ^GNU core.txt.1
GNU gdb (GDB) 7.12.1 [GDB v7.12.1 for FreeBSD]
# pkg remove gdb
# crashinfo
Writing crash summary to /var/crash/core.txt.1.
# grep ^GNU core.txt.1
GNU gdb 6.1.1 [FreeBSD]
# mv /usr/bin/gdb /usr/bin/gdb.not
# crashinfo
Please install GDB and run 'crashinfo' again.
The easiest way to install GDB is: pkg install gdb
# crashinfo -b
Writing crash summary to /var/crash/core.txt.1.
# cat core.txt.1
Please install GDB and run 'crashinfo' again.
The easiest way to install GDB is: pkg install gdb
```