I use git (2.2.1) on OS X (10.9.5) and recently my repo got into a bad state. I think this involves a mis-handling of case-insensitive file systems. This reproduces the problem: > git init Initialized empty Git repository in /Users/aarond_local/code/git-test/.git/ > git commit --allow-empty -m 'first commit' [master (root-commit) 923d8b8] first commit > git checkout -b feature Switched to a new branch 'feature' > git checkout -b Feature fatal: A branch named 'Feature' already exists. > git checkout -B Feature Switched to and reset branch 'Feature' > git branch -d feature Deleted branch feature (was 923d8b8). > git log fatal: bad default revision 'HEAD' This is the behavior when there isn't a case mismatch, which is what I would have expected in the previous case as well: > git init Initialized empty Git repository in /Users/aarond_local/code/git-test/.git/ > git commit --allow-empty -m 'first commit' [master (root-commit) 48df19f] first commit > git checkout -b feature Switched to a new branch 'feature' > git branch -d feature error: Cannot delete the branch 'feature' which you are currently on. I can also reproduce the issue on git 2.5.0. -Aaron Dufour -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html