Diagnosis
You left non-oven-safe items inside or didn't remove the racks. The pyrolytic cycle heats to over 880°F. It will incinerate anything left inside.
How to Fix It
Immediately cancel the clean cycle if possible. Let the oven cool completely. Do not open the door while it's hot. Once cool, open and inspect. Remove all oven racks, thermometer probes, foil, and any debris. The smell is likely melted rack glide coatings or incinerated food spillover. Clean the cooled interior with a damp cloth to remove ash.
If That Didn't Work
If the smell persists after a thorough cleaning, a small piece of plastic (like a utensil or bag) may have fallen into the bottom vent or insulation. This requires disassembly by a technician.
Heads Up
The oven racks on this model are NOT pyrolytic safe. You must remove them before starting the clean cycle. explicitly states this. The high heat will damage the rack coating.