System Information
Operating system: Linux-5.14.0-3-amd64-x86_64-with-glibc2.32 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 495.44

Blender Version
Broken version: 3.1.0 Alpha, branch: master, commit date: 2021-10-30 22:26, hash: rBae9052a33e64
Worked: Bisecting points to versions prior to rB43bc494892c3

Short description of error
When entering edit mode of an object, selecting part of the mesh, then sepating that part from the rest, Blender will crash.

Exact steps for others to reproduce the error

1. Open Blender.
2. Select a mesh object.
3. Enter edit mode.
4. Select a portion of the mesh.
5. Separate the selected portion of the mesh by pressing P and selecting the Selection option.
6. Blender should crash.