[BUG?] push to mirrior interferes with parallel operations

Hello all,

I have a repository populated with git-svn. For backup I have a mirror remote set up. Today I ran 'git push backup' on one terminal and before it finished (it's just on a network filesystem, so it's kind of slow), I ran 'git svn fetch' on another. And than I didn't see any results of that fetch.

What happened is that the push took the values of all the refs -- including those in refs/remotes/svn as it's a mirror for pushing them to the backup. Meanwhile the fetch udpated them. But when the push finished with the remote repo, it updated the local refs back to the values it pushed, undoing the effects of that fetch.

The repository was created with simple:

    git remote add --mirror backup /mnt/server/path/to/repo.git

which created configuration:

    [remote "backup"]
	url = /mnt/server/path/to/repo.git
	fetch = +refs/*:refs/*
	mirror = true

So, should the push be more careful when updating the refs, not simulate the pull back when doing a --mirror, or the git remote add not add the 'fetch = +refs/*:refs/*' line?

Thanks, Jan