go packages are not reproducible within OE-Core and have to be excluded from our testing, they're one of the only pieces of OE-Core left which don't reproduce. Alex Kanavin did do some work on this which is at http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=akanavin/go-repro We probably need to work with the upstream go developers to figure out a proper solution.
They are reproducible now :)