Since I started using the release 2.4.0 kernel I am finding billions of the above error messages on the console from which X is started and in the syslog and kern.log. This happens whenever an app, such as Gnome CD player or Musicmatch Jukebox accesses an audio CD. Everything seems to work OK, but my logs grow alarmingly. I switched back to 2.4.0-test12 and the problem goes away. I diff'ed the .config files and see nothing related to CD-ROM or SCSI.
I'm running up to date Sid and have an Initio SCSI card and Toshiba SCSI CD-ROM (and Yamaha SCSI CDRW, seemingly uninvolved with this). Anybody else see this problem?