System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: AMD Radeon RX 5700 XT ATI Technologies Inc. 4.5.14761 Core Profile Context 21.10.2 30.0.13025.5005

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-10-17 17:10, hash: rB452c78757f44

Exact steps for others to reproduce the error

• Load above .blend file
• Attach the re-route node back into the Set Position Geometry input
• Observe blender hanging (it's busy spinning)

[Examples]
-If for some reason you connect geometry nodes in a loop while they are being computed blender simply hangs instead of just not letting you make a loop.

-it does not happen if its connected outside the nodes that are being computed

-in shader nodes, if some loop occurs it simply is not computed