repo sync error: .repo/manifests/: contains uncommitted changes

Question

After issued repo sync, I got a error message like error: .repo/manifests/: contains uncommitted changes, but git status or git diff showed nothing changed.

What's cause of the problem and why it happened?

Answer 1

Find the root cause, all files under .repo/manifests were changed with their filemode, "git config core.filemode false" can fix this "Modify".