I don't think that you've done anything wrong, but I do think that you're jumping the entire shoot-out, not just the gun. If there isn't a reason that you need to have the very latest kernel version, you should probably expect to find a few unironed bugs in the latest WIP releases. I would just hang back until the next version of the kernel in question came out.
But if you're like some people I know, and absolutely have to have the latest and greatest, you could double check all your kernel dependencies, or maybe try compiling the network driver as a module instead of it being built-in. It sounds trivial, but I've had it fix a few problems before.
Like I said, don't stress out over the latest kernel not playing nicely.