[Bacula-users] Device is blocked labeling a Volume

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CentOS 6 based backup server with Bacula 5.0.0-9.el6 from the CentOS 6
base repository and an HP 8-slot LTO-3 autochanger, no barcode reader.
This evening's backup jobs are hanging, with the first one in state
"running" but not making any progress, and all others in state "waiting
execution". "status storage" says:

====

Device status:
Autochanger "HP1x8autoloader" with devices:
   "LTO-3" (/dev/nst0)
Device "FileStorage" (/tmp) is not open.
Device "LTO-3" (/dev/nst0) is not open.
    Device is blocked labeling a Volume.
    Drive 0 is not loaded.
====

There are no console messages or operator mails.
Things I already tried with no effect:

*reload
*release LTO-3
3921 Device "LTO-3" (/dev/nst0) already released.
*unmount LTO-3
3901 Device "LTO-3" (/dev/nst0) is already unmounted.
*mount LTO-3 slot=3
3903 Device "LTO-3" (/dev/nst0) is being labeled.
*

What does that mean, how do I get out of that state without too much
damage, and how can I avoid getting into it again?

Thanks for any hints,
Tilman
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