# netstat -rnF 1 Routing tables (fib: 1) netstat: sysctl: net.route.0.0.dump.1: Cannot allocate memory # uname -a FreeBSD us.hshh.org 10.1-RC1 FreeBSD 10.1-RC1 #0 r272565: Sun Oct 5 14:53:02 UTC 2014 root@us.hshh.org:/usr/obj/usr/src/sys/hshh amd64 It works while using `setfib 1 netstat -rn`. There are also other people got this bug, https://forums.freebsd.org/viewtopic.php?f=7&t=46972 .
Fixed in 10.1-RELEASE