I straced umount, and found that it actually does not do anything with
the loop device itself, or calls losetup. I suppose what happens is that
the kernel itself tears down the loop device when you umount() a device
which was mounted with -o loop (I don't see a mount option in
/proc/mounts which would indicate this, so there must be some internal
housekeeping flag?). I guess this code path is simply missing the
kobject_uevent() call.

** Changed in: linux (Ubuntu)
     Assignee: Martin Pitt (pitti) => (unassigned)

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https://bugs.launchpad.net/bugs/548546

Title:
  Nautilus does not remove usb drive made with USB-Creator after
  unmounting it

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