This post over at StackOverflow suggests you need to add the /bin/bash shell to the git user (The person answering the question calls it a /bin/bash group, but it's a shell attribute on the user :) ). Give that a try.
http://stackoverflow.com/questions/22314298/git-push-results-in-fatal-protocol-error-bad-line-length-character-this -- You received this message because you are subscribed to the Google Groups "GitLab" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
