After you've spent too much time searching out an error, and you know exactly the right search terms to use, only then can Google find:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=302046

If you do have any DELL Poweredge 2650's left in service, install memtest86+, see if it throws this error, resolve by disabling USB (if you can).

Argh......