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This appears to be specifically related to Atom with Git.
I can successfully change my .gitconfig using either direct editing or by entering the git command:
$ git config --global core.editor "<editor> -w"
When editor is emacs or gedit, I have the experience one would expect. Git waits for a commit message to be written, and when the editor is done, git reads the commit message and finishes the commit.
When I set Atom as the editor, Git launches Atom, but then keeps waiting after I've saved (bad) and quit (worse). I'm left with Git in a wait state and have to CTRL-C my way out of it. This leaves me in an odd state where COMMIT_EDITMSG has been written to .git, but Git can't/won't see it.
Fedora 23. Atom 1.40.1. Git 2.5.5
Your thoughts (other than that I should probably stop running antique software)?