System Information
Operating system: linux
Graphics card: amd

Blender Version
Broken: blender-3.0.0-alpha+master.79425ed32676-linux.x86_64-release
Worked: 3.0.0 Alpha, branch: master, commit date: 2021-08-28 20:38, hash: rB4256eeeec4ca

Short description of error
In particle hair edit mode, try to use any tool like comb, add, etc. Blender hangs and never wakes up

Exact steps for others to reproduce the error
Open attached blend file:

Make sure you are in particle edit mode. Select any tool (brush) on the left, e.g. comb, puff, add:

Try to stroke the brush over particle hair.
Result: blender hangs.