... otherwise you can accidentally run this on a mounted filesystem or a block device in use by e.g. LUKS and RAID (if this is what you want, you should pass a special --force option or similar).
Fixed dy upstream commit c550f728f724360f99aae0fdb45b0589d9a347e0, Fedora package will be updated ASAP.
util-linux-2.22.1-2.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/util-linux-2.22.1-2.fc18
util-linux-2.22.1-2.1.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/util-linux-2.22.1-2.1.fc18
Package util-linux-2.22.1-2.1.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing util-linux-2.22.1-2.1.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-17448/util-linux-2.22.1-2.1.fc18 then log in and leave karma (feedback).
I suspect this is the cause of bug 872831.
Patch posted to add --force option: http://article.gmane.org/gmane.linux.utilities.util-linux-ng/6801
util-linux-2.22.1-2.1.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.