How can I find what process is trying to write to a CD that's offline?

Question

I've got a Virtual CD which can mount remote media via IPMI. After doing an install of Ubuntu 12.10 I'm getting this error every 2 sec in the syslog and on the console:

  [628.890722] sr 6:0:0:0: rejecting I/O to offline device

How can I figure out what is trying to write to that CD, it's certainly offline as I don't have any remote media mounted via IPMI right now.

Answer 1

You could give it a try using lsof with the path to the cd drive as argument to see which process is using it.

lsof /path/to/cd or lsof -a /path/to/cd