[Bug 558926] Re: Open files on ejected media cause automount of new media to break

[Phillip Susi]

The problem seems to be that the kernel STILL can not properly force
unmount.  If I umount -f /dev/sr0 it fails with -EBUSY.  A lazy umount
leaves the filesystem still mounted.  If I umount -l /dev/sr0 then try
to open the drive in nautilus again I get:

Error mounting: mount exited with exit code 1: helper failed with:
mount: /dev/sr0 already mounted or /media/cdrom0 busy

As long as a process keeps an open fd, the filesystem remains mounted (
but hidden from the namespace ), which prevents you from mounting it
again, even if new media has been inserted.  You also can not use lsof
to find what process still has files open since they have been removed
from the namespace.

There also does not seem to be a way to undo a lazy umount and reattach
the mount point to the namespace.

-- 
Open files on ejected media cause automount of new media to break
https://bugs.launchpad.net/bugs/558926
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