When testing the webdav provider with the built-in JCR jackrabbit repository there is a number of Webdav temp directories left around under windows. When you enable debug logging, you can see that it failed to delete them. What you can see are active jackrabit and jetty logfiles.
The reason for them is, that the JCL Appenders do not get removed/closed on shutdown.
(I also wonder why this is outside the target/ directory).