What would be your stance on the use of GMO in a socialist society

I don't have a stance on it - that would be for them to decide. That is the whole point of socialism. If you asked me what they'd probably decide about it, I'd say that they would probably find a use for it - and a lot faster than a capitalist society would (as capitalist society hamstrings it's own scientific development due to everything in that society being slaved to the irrelevant profiteering needs of a capitalist elite).

It's highly unlikely that they'd use it for food production - considering that food production has, for centuries now, been perfectly adequate (despite the right's Malthusian histrionics) and that every major famine we've experienced since the Enlightenment could easily have been prevented if our food distribution wasn't under the control of imperialist interests.

and the use of the crops/seeds would be under governmental control?

There can be no such thing as a socialist society where anything is under government control. If it has a state, it's not socialist in any way or form. The purpose of socialism is, and has always been, to place the productive labor of humanity under the control of the people performing said labor - not a state that will simply entrench it's own power and privilege by handing all the fruits of said labor to a class of complicit and parasitic aristocrats/capitalists/party apparatchiks.

That is the whole point of socialism.