git rebase: "error: cannot stat 'file': Permission denied"

When I see this on my machine, it's worse than just a "some process has the file open". The actual ownership of the file gets jacked up to the point where I (running as administrator) can only access it after rebooting.

Nearest I can tell, IIS is part of the problem. If I switch between two major branches that require a lot of files to modify, git will delete a file or directory (usually DLLs) while IIS is trying to do something or another with it. At this point, the IIS process automatically overwrites the file on disk with a version that's locked and appears to be owned by nobody.

Stopping IIS at this point doesn't do it. Best I've found out to do is to reboot, and remember to stop IIS before changing across major branches in the future.

I know that doesn't really answer the question, but might be helpful to others.

Try closing any programs that have the folder open, such as editors, explorer windows, command prompts, and FTP programs. This always fixes the issue for me on Windows.

I've only ever seen this error on Windows and what it seems to mean is that something blocked git from modifying a file at the moment when it tried to a apply a patch.

Windows tends to give processes exclusive access to files when it shouldn't really be necessary, in the past virus checkers have been one source of suspicion but I've never proved this conclusively.

Probably the easiest thing to do is to abort and try again, hoping that it doesn't happen the next time.

git rebase --abort

You can attempt to use git apply and knowledge of what commit git was actually trying to do before doing a git rebase --continue but in all honesty I wouldn't recommend this. Most of the times I've seen this tried there's been a better than evens chance that something gets accidentally missed or messed up.

Just close your IDE (VISUAL STUDIO/ATOM etc). It might work