protected UndefinedDBTraceData doCreateUnit(long snap, Address address) {
		space.assertInSpace(address);
		return manager.doCreateUndefinedUnit(snap, address, space.getThread(),
			space.getFrameLevel());
	}
Generate an undefined data unit at the given point

@param snap the snap of the unit
@param address the address of the unit
@return the unit
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/database/listing/DBTraceUndefinedDataView.java