Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.64
Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-07 23:24, hash: rB749d53effd58
Worked: May 26 build works fine. May 31 is broken. I don't have builds in-between.
Short description of error
Adding any modifier to a curve/nurbs and tweaking anything in the modifier or in edit mode will increase memory usage.
Exact steps for others to reproduce the error
Open blend file, press "G" to move and look at the memory.
Add a curve to a new scene, it doesn't matter if it's a bezier, path or NURBS
Add any modifier to this curve