git pull for update of netdev fails.

Jeff, you use branches on the netdev tree, but GIT doesn't seem to like to sync these up properly. My normal method is to keep a clone'd version of the netdev tree and use pull to resync it. I don't do any changes to that tree.

This doesn't work with all the branches for some reason. Is this a git bug?

$ git pull
Generating pack...
Done counting 666 objects.
Result has 400 objects.
Deltifying 400 objects.
 100% (400/400) done
Unpacking 400 objects
Total 400, written 400 (delta 324), reused 0 (delta 0)
 100% (400/400) done
* refs/heads/origin: fast forward to branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/netdev-2.6
  from f04b92e97d21b1921c91ec1d6d5e8bbf8606b77a to e478bec0ba0a83a48a0f6982934b6de079e7e6b3
* refs/heads/e100-sbit: does not fast forward to branch 'e100-sbit' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/netdev-2.6;
  not updating.

A temporary workaround is to prune the offending branches locally first, but that seems like a hack.