Hummingbird Cake

Name: Hummingbird Cake
Ingredients: Nonstick vegetable spray; All-purpose flour, for pans; 3 cups self-rising flour; 2 cups granulated sugar; 3/4 cup vegetable oil; 1/2 cup finely chopped pecans; 2 very ripe large bananas, mashed; 1 (8-ounce) can crushed pineapple, with juice; 1 teaspoon pure vanilla extract; 1 teaspoon ground cinnamon; 4 large eggs, beaten; 1 pound (1 box) confectioners' sugar; 8 ounces cream cheese, room temperature; 6 tablespoons (3/4 stick) unsalted butter, softened; 1 tablespoon milk, or more if needed; FOR THE FROSTING; 2 very ripe large bananas mashed