When trying to burn a DVD it sometimes happens that growisofs will fail with:
$ sudo growisofs -speed=8 -dvd-compat -Z /dev/scd0 -J -r . Executing 'genisoimage -J -r . | builtin_dd of=/dev/scd0 obs=32k seek=0' I: -input-charset not specified, using utf-8 (detected in locale settings) 0.23% done, estimate finish Fri Sep 16 14:49:33 2011 0.46% done, estimate finish Fri Sep 16 14:49:33 2011 0.69% done, estimate finish Fri Sep 16 14:49:33 2011 :-( unable to O_EXCL /dev/scd0: someone was in time to remount?
This only seems to happens when burning multiple DVD's in a row and I think it happens when I eject an automounted disc without manually unmounting it first, which implies that something is keeping the drive busy,
fuser however fail to find a process still accessing the drive. Rebooting makes the problem go away.
How can I find out what process is causing this issue?