Swedish tabloid Expressen reports that AF 276, when passing over Stockholm enroute to Tokyo/NAR made some wide turns over the Baltic, dumping fuel, then turned back to CDG.
The reason for aborting the flight is according to Expressen, problems with a door.
The aircraft is according to Flightaware an Airbus 380.
At the time of writing this (18:40 CET) the aircraft is overhead north-west Germany.
The aircraft is currently flying at low speed and reduced altitude[297KN, FL250]
The aircraft appears to be F-HPJG, maiden flight on september 23, 2011