Edit: Narrowed this down to virtfs mounts.
To jump to the question, mount says the partition is already mounted and umount says that the partition is already unmounted, and fsck agrees with mount. Cannot fsck, mount or umount the partition without a reboot.
Now for details. An ext4 filesystem for a backup partition on an LVM setup went dirty, so I'm attempting to fsck it.
I was able to unmount it without complaints, and confirmed with mount output; it's no longer mounted.
However, when I run the fsck I get complaints that the filesystem is in use:
root@server# fsck -M -C0 -fy /dev/mapper/vg_dr-lv_backup2 fsck from util-linux-ng 2.17.2 e2fsck 1.41.12 (17-May-2010) /dev/mapper/vg_dr-lv_backup2 is in use. e2fsck: Cannot continue, aborting.
Meanwhile, nothing seems to be using the partition or the mount point:
root@server# lsof /dev/mapper/vg_dr-lv_backup2 root@server# fuser /dev/mapper/vg_dr-lv_backup2 root@server# lsof /backups/servername/backup2 root@server# fuser /backups/servername/backup2 root@server#
To be thorough:
root@server# lsof | grep backup2 root@server#
Yet fsck still complains that it is in use. Now the fun part; mount also thinks it's already mounted:
root@server# mount -v /dev/mapper/vg_dr-lv_backup2 /backups/servername/backup2/ mount: you didn't specify a filesystem type for /dev/mapper/vg_dr-lv_backup2 I will try type ext4 mount: /dev/mapper/vg_dr-lv_backup2 already mounted or /backups/servername/backup2 busy
While the lsof / fuser output remains blank, and umount thinks it is not already mounted:
root@server# umount -v /dev/mapper/vg_dr-lv_backup2 Could not find /dev/mapper/vg_dr-lv_backup2 in mtab umount: /dev/mapper/vg_dr-lv_backup2: not mounted
Without a way to force it to check a 'mounted' filesystem I am forced to reboot, however I cannot help but think there is simply something I'm missing.
One more thing I tried was using findmnt:
root@server# findmnt | grep backup2 root@server#
I am very open to suggestions.