Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.11
Broken: version: 3.0.0 Alpha, branch: cycles-x, commit date: 2021-07-06 15:38, hash: rB3ea9646c1802
Short description of error
Geometry Nodes crash when using Material Assign node on instanced Bezier geometry during render. Additionally using Material Assign node makes instanced Bezier object no longer appear in the viewport.
The following error when running in debug mode and right after switching view to Rendered mode.
Malloc array aborted due to integer overflow: len=4294967295x12 in BKE_mesh_calc_normals_poly, total 24066760
Exact steps for others to reproduce the error
Open attached file and change view to Rendered, Blender will crash. Also, mute Material Assign node and note that geometry is now visible in the viewport.