would deveopers of core-packages take a look at this?
https://bugzilla.redhat.com/show_bug.cgi?id=887763#c37
god knows what happens here with the /etc/mtab symlink
BUT this all did never happen before "the problems with
/etc/mtab" where "solved" by replace it with a symlink
may i suggest to make nails with heads and fix packages
that any usage of /etc/mtab is REPLACED with directly
look at /proc/mounts?