From: Junio C Hamano
The command refuses to process new mailboxes while .git/rebase +
The command refuses to process new mailboxes while .git/rebase-apply directory exists, so if you decide to start over from scratch, -run rm -f -r .git/rebase before running the command with mailbox +run rm -f -r .git/rebase-apply before running the command with mailbox names.
Before any patches are applied, ORIG_HEAD is set to the tip of the current branch. This is useful if you have problems with multiple @@ -573,7 +573,7 @@ errors in the "From:" lines).
Written by Junio C Hamano <junkio@cox.net>
Written by Junio C Hamano <gitster@pobox.com>