Low project loading speed when using Ubuntu 24.10

Unity: Native Editor Application Lifecycle

Linux

6.1.X

6.0.X

2022.3.X

2021.3.X

When Unity launches a child process, we close file descriptors inherited from the parent in a more efficient manner.

Unity 2021.3 is no longer supported.

Reproduction steps:
1. Create a new 3D project

Expected results: Project is created and loaded in <15 seconds
Actual results: Project is created and loaded in ~3 minutes

Reproduced with: 2021.3.45f1, 2022.3.51f1, 2023.2.0a17, 6000.0.23f1
Not reproduced with: 2023.2.0a16

Reproduced on: Ubuntu 24.10
Not reproduced on: Ubuntu 22.04, Ubuntu 24.04, Fedora 40, Arch (Endeavour)