schroot S.O.S: permanently active sessions after sbuild breaks

[Daniel Stender <daniel@danielstender.com>]

Hi,

after some sbuild breaks which came from experimenting with setting up 
ccache with sbuild (https://wiki.debian.org/sbuild) I've now discovered 
that there are several schroot sessions permanently running at the same 
time on my system, which I can't close because it says "resource busy".

To make it clearer, this is what my mount looks like: 
http://paste.debian.net/118558/

I need schroot exprienced help to recover a clean system.

Greetings,
Daniel Stender

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