Description of problem: [root@hubbitus temp]# umount /home/pasha/temp/Fedora-korda/tmp/imgcreate-jH8Dyp/install_root umount: /home/pasha/temp/Fedora-korda/tmp/imgcreate-jH8Dyp/install_root: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) [root@hubbitus temp]# fuser -m /home/pasha/temp/Fedora-korda/tmp/imgcreate-jH8Dyp/install_root [root@hubbitus temp]# fuser -km /home/pasha/temp/Fedora-korda/tmp/imgcreate-jH8Dyp/install_root [root@hubbitus temp]# lsof | grep imgcreate-jH8Dyp lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/pasha/.gvfs Output information may be incomplete. [root@hubbitus temp]# umount /home/pasha/temp/Fedora-korda/tmp/imgcreate-jH8Dyp/install_root umount: /home/pasha/temp/Fedora-korda/tmp/imgcreate-jH8Dyp/install_root: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) # mount | grep imgcreate-jH8Dyp /dev/loop0 on /home/pasha/temp/Fedora-korda/tmp/imgcreate-jH8Dyp/install_root type ext4 (rw) Version-Release number of selected component (if applicable): # rpm -q util-linux-ng util-linux-ng-2.14.2-9.fc11.i586 How reproducible: Always. Steps to Reproduce: It is loop mounted image in livecd-creator ( https://bugzilla.redhat.com/show_bug.cgi?id=523164 ).
The error EBUSY is usually generated by kernel, try # strace -o ~/umount.log umount <mountpoint> # $EDITOR ~/umount.log to see more details. The umount(8) is a simple wrapper around the umount syscall only. I guess there is any process that access the filesystem or so. Please, check it with F-12 and reopen if the problem is still reproducible.