I had tried autofs5 before to try and resolve without success.
This time I purged autofs first.
I kept the delivered version of auto.master and added my one line to it (the
difference from my previous attempt was not to remove the +auto.master line).
Restarted and the mount umounted after the
** Attachment added: autofs map files
http://launchpadlibrarian.net/37358049/autofs_files.tar
** Bug watch added: Debian Bug tracker #279898
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=279898
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autofs4 doesn't timeout cifs mounted shares
https://bugs.launchpad.net/bugs/502262
You
Forgot to mention... there is lots of forum entries on this issue dating back a
long time.
There is a debian bug for the previous version of autofs which was previous
closed:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=279898
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autofs4 doesn't timeout cifs mounted shares