I don't think the errors have anything to do with the ntfs partition.
An article on this webpage explains how these locks are used.
You should check the filesystem on the root file system (/) unless you have /var on it's own filesystem. It sounds like there is a problem with it so it was mounted read-only.
I think that "errors=continue" may be a default option. If there is an error in the filesystem during mounting, there are three possible options that may be
indicated. 1) abort 2) mount readonly 3) try to repair the error.