A bit over extended at the top, lapsing into flexion at the bottom. I can't see your upper back well due to the rack uprights, but you look a little kyphotic too. Work hard to keep your chest "proud" at the top, while simultaneously crunching your abs hard to avoid over-extending your spine. Then hold that exact back rigidity as you descend - so only the angle changes, from the waist. The spinal relationships themselves should not change at all, i.e. no flexion.
Control your descent so you don't fall into the hole, and this will help with the above as well.
One of the things I often see with kyphosis, is an inability to lean over properly due to the bar tending to role up on the lifter's back. To some extent, you can't "fix" a structural kyphosis, but you can make damn well sure you're showing a "Superman Chest" as best you can, even when you lean over, and that you're trapping the bar in place so it doesn't roll up. That will enable you to lean over properly, control your descent, and then drive up - all without the bar rolling up, and without lapsing into flexion.