Those are core files. They are produced when a program SEGFAULTs. This is not a bug, although the contents of the core files may indicate a bug in whatever program produced it.
-- Files appearing in home folder corexxxxx https://launchpad.net/bugs/64292 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
