Rasbmc mount: / is busy

[ad5du]

After I got Raspbmc set up like I wanted I started getting mount: / is busy when shutting down.
I thought the problem may have solved it self, but even when I don't see it if check the sdcard in my
other computer the filesystems have been left unclean and I have to run fsck.

[cpc464]

It seems that raspbmc or other app is holding one or more files open on the root partition. The guilty app needs to cleanly close the file and stop running in response to your shutdown command, but it isn't. It would appear to be a bug in raspbmc (or whatever app).

What command are you using to shut down the pi?

[ad5du]

Sorry for the late reply.

Don't always see mount: / busy .
However It still is not cleanly unmounting the filesystems, whether I use the Power off System or Reboot from the menu or give a command such as sudo poweroff or sudo halt.

I don't get it shutdown on a PC running linux will kill all processes which would close any files. Why should this be different?
Googling I find others who have had this problem but I haven't found a solution.