How to clean up an unprocessed orphan inode list?

Solution 1:

If you're using ext2 / ext3 / ext4 you should be able to use e2fsck to clean up orphaned inodes:

e2fsck -f

For reiserfs, you can use reiserfsck which will also clean up orphaned inodes.

Solution 2:

e2fsck -f <mount point> won't work.

First find out the mount points with

sudo mount -l

Then fsck the drive directly.

For example for me

sudo e2fsck -f /dev/xvda2

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Solution 3:

You clean up the unprocessed orphan inode list by unmounting and remounting the filesystem.

An extended discussion from the linux-ext4 mailing list has more information about what this message is and why it may appear. In short, one of two things has happened: Either you've run into a kernel bug, or much more likely, some filesystem corruption happened one of the previous times you remounted the filesystem readonly. Which is probably why the system thinks something is still using the filesystem when there isn't.

If it's been a year and you still haven't rebooted the machine, just give up and schedule a maintenance window.