I wrote:
> "tapelist" has size zero. I label a tape with amlabel, and it still has
> size zero, although you can tell from the date that it has been touched.

Thanks to the one who suggested to run amlabel with strace: a nice "no
space left on device" had been returned when amanda had tried to write
to the file - my root filesystem was full.

Of course it is an amlabel bug that it did not display an error message.
I looked at the code, and it's not a trivial fix. Where do I check if
it's already reported?