root@famp:~ # freebsd-update upgrade -r 11.0-RELEASE
Looking up update.FreeBSD.org mirrors... 4 mirrors found.
Fetching metadata signature for 10.3-RELEASE from update3.freebsd.org... done.
Fetching metadata index... done.
Fetching 1 metadata patches. done.
Applying metadata patches... done.
Fetching 1 metadata files... done.
Inspecting system... done.

The following components of FreeBSD seem to be installed:
kernel/generic world/base world/lib32

The following components of FreeBSD do not seem to be installed:
src/src world/doc world/games

Does this look reasonable (y/n)? y

Fetching metadata signature for 11.0-RELEASE from update3.freebsd.org... done.
Fetching metadata index... done.

The update metadata is correctly signed, but
failed an integrity check.
Cowardly refusing to proceed any further.
root@famp:~ # uname -ra
FreeBSD famp.frank2.net 10.3-RELEASE-p11 FreeBSD 10.3-RELEASE-p11 #0: Mon Oct 24 18:49:24 UTC 2016     root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64