Big ball of changes
When you are writing commit message, and you don't know what to put in single line summary of changes, it does probably mean that you put too many independent things in a single commit. Better to split commit into smaller, using "git rebase --interactive", and/or "git add --interactive" and friends (like "git stash --keep-index" to test stashed changes).
Having single issue per commit will help tremendously when trying to find bug using "git bisect".
