Sounds like error message is not clear. But as there is no disc, the mount 
action should fail anyway.
What happens when there is a disc in the drive?

--
Joost

On 16 August 2019 16:23:36 CEST, Helmut Jarausch <jarau...@skynet.be> wrote:
>Hi,
>
>I have a very strange effect on my Gentoo system.
>First, I've check that /dev/sr0 points to the correct device (from  
>dmesg)
>
>For an empty drive  I get
>
>1 # mount /dev/sr0 /cdrom
>mount: /cdrom: /dev/sr0 already mounted or mount point busy.
>
>2 # lsof /dev/sr0
>
>3 # umount /dev/sr0
>umount: /dev/sr0: not mounted.
>
>
>Does anybody know what's going on here?
>
>Many thanks for a hint.
>
>P.S. I have checked this with two physically different drives.

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