The syscall mount(2) returns EBUSY on /dev/fd0, because libmount does not close a device file descriptor used originally for filesystem probing.
# mount /dev/fd0 /mnt
mount: /dev/fd0 is already mounted or /mnt busy
Fixed by upstream commit 6257e4458295e4a731e3979588e21c95c0cc7186.
util-linux-2.21.2-1.fc17 has been submitted as an update for Fedora 17.
* should fix your issue,
* was pushed to the Fedora 17 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing util-linux-2.21.2-1.fc17'
as soon as you are able to.
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util-linux-2.21.2-1.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.