can't create a branch on remote

Hi, I have two repositories  /home/user/linux and /home/user/dev/linux, same user on same machine. Here is how I create a local branch at v2.6.21.7 in /home/user/dev/linux, #pwd /home/user/dev/linux # git remote add l2621 git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.21.y.git # git fetch l2621 # git branch mylocal26217  v2.6.21.7

Now I would like to do the same from the other repository /home/user/linux:
# pwd
/home/user/linux
# git remote add other /home/guerin/dev/git/linux-2.6
# git fetch other
# git push /home/user/dev/git/linux-2.6
    v2.6.21.7:refs/heads/new_feature_name26217
Total 0 (delta 0), reused 0 (delta 0)
error: Trying to write non-commit object
170684ef0557d4b711a86595d31dcbebcb9d4ba2 to branch
refs/heads/new_feature_name26217
To /home/user/dev/git/linux-2.6
 ! [remote rejected] v2.6.21.7 -> new_feature_name26217 (failed to write)
error: failed to push some refs to '/home/user/dev/git/linux-2.6'

Maybe something to configure to authorize the creation of branch?

Thanks, Auguste.