Oven smells like gas when on

If the oven is new and has never been used, it should be cured before using. There is a curing your oven page in all manuals before use. You have to wash and burn off all the chemicals used in making the thing. Are u sure it sets off the smoke alarm and not the carbon monoxide alarm. Be careful some alarms are equipped with both now a days and people cant tell the difference. Get your gas company there to check it. Carbon monoxide is undetectable to the nose and is deadly so please be very careful! If there is smoke and u have cured ur oven then there maybe some old food on the burner, remove the bottom plate and check. If there is no smoke and no food on the burner then u need to change ur ignitor. It maybe old, cracked or both. Typical repair cost on high end range is 300 - 400 for 1 ignitor. Good luck. And I urge u to see if it is Carbon Monoxide!