I think I recently saw this problem too.  The problem as I saw it was 
when I did added new unlabeled tapes to my changer.  My changer Dell 
PowerVault 136T managed to accept tapes that it shouldn't.  I have two 
drives and both had tapes in them.  When it imported the tapes from the 
in/out slots to the regular slots it put them in slots which should have 
been reserved (due to the tape not being in it's regular slot but being 
loaded in a drive).  As a result, when bacula went to unload a drive the 
home slot was full and couldn't be used.  Unfortunately, when I ran an 
update slots on the changer it became apparent that somewhere in the 
code for either the director or sd bacula wasn't updating the slot info 
for mounted tapes.

I had to use the right mtx command to unload the tape and then restart 
bacula to get that resolved I think.

Is it possible you were having new tapes imported while drives were full 
  too?


> From: Blake Dunlap <blake AT ISDN DOT NET>
> Subject: Re: [Bacula-users] question reguarding autochanger use
> Arno,
> 
>         Thank you for the help as usual. I understand what the problem is 
> (well symptom), and 
 >agree with the risks for deadlock if there is anything else going on. 
In theory this should never
 >occur, but I am seeing it weekly. All technicians that interact with 
the changer state they are
>correctly following procedure and asking Bacula to update slots when finished, 
>and confirming 
 >that data is returned. I am not sure if it is a problem with the 
script possibly missing tape
 >locations sometimes, perhaps my autochanger is being defiant, 
something is directly accessing
 >the autochanger around Bacula, or more simply my technicians are not 
properly following procedure.
 >At this point I am trying to countermand this specific error 
programmatically as when this occurs,
 >I can be fairly confident about the tape changer being stuck in any case.



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