Marco Carcano- Statusnobilis SA wrote (2013/04/16):
> /usr/libexec/bacula/mtx-changer /dev/sg3 listall 0 /dev/nst0

Do you have write permissions on /dev/sg3?

> 3991 Bad autochanger command: /usr/libexec/bacula/mtx-changer /dev/sg3 
> loaded 1 /dev/nst0 0
> 3991 result="": ERR=Child died from signal 9: Kill, unblockable

Try this command from command line, still the same result?
Then you can try strace -f ... 2>strace.out a see, where it dies.

-- 
Rudolf Cejka <cejkar at fit.vutbr.cz> http://www.fit.vutbr.cz/~cejkar
Brno University of Technology, Faculty of Information Technology
Bozetechova 2, 612 66  Brno, Czech Republic

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