Crash when Accelerator cache server upload is enabled

Reproduction steps:

1. Unzip the user’s project
2. Install the necessary Unity version for testing (other versions can be tested by tweaking the path in run-repro.py)
3. Install the Accelerator locally
4. Run run-repro.py
5. Observe the crash

Reproducible with: 2021.3.7f1, 2022.1.12f1, 2022.2.0b3, 2023.1.0a4
Couldn’t test with: 2020.3.37f1 (the project should not be downgraded)

Reproduced on: macOS 12.4 (Intel)

Notes:

• run-repro.py script loads the editor 3 times, and on the third run, it should crash. It can take more or less runs to crash.
• no stacktrace.

The output when it reproduces is something like this:

Accelerator version is v1.0.941+g6b39b61 logged 1.0 days ago
New editor settings 127.0.0.1 3DURP_Crash_569
Running: /Applications/Unity/Hub/Editor/2021.3.5f1/Unity.app/Contents/MacOS/Unity -projectPath /Users/dave/Proj/Zynga/3DURP_AcceleratorCrash -logfile /Users/dave/Proj/Zynga/3DURP_AcceleratorCrash/Editor.log
found line AcceleratorClientConnectionCallback - connected - 127.0.0.1:10080 at 0.2 minutes
found line [Project] Loading completed in 84.356 seconds at 1.4 minutes
NukeDir("/Users/dave/Proj/Zynga/3DURP_AcceleratorCrash/Library")
Running: /Applications/Unity/Hub/Editor/2021.3.5f1/Unity.app/Contents/MacOS/Unity -projectPath /Users/dave/Proj/Zynga/3DURP_AcceleratorCrash -logfile /Users/dave/Proj/Zynga/3DURP_AcceleratorCrash/Editor.log
found line AcceleratorClientConnectionCallback - connected - 127.0.0.1:10080 at 0.2 minutes
found line [Project] Loading completed in 76.384 seconds at 1.3 minutes
NukeDir("/Users/dave/Proj/Zynga/3DURP_AcceleratorCrash/Library")
Running: /Applications/Unity/Hub/Editor/2021.3.5f1/Unity.app/Contents/MacOS/Unity -projectPath /Users/dave/Proj/Zynga/3DURP_AcceleratorCrash -logfile /Users/dave/Proj/Zynga/3DURP_AcceleratorCrash/Editor.log
found line AcceleratorClientConnectionCallback - connected - 127.0.0.1:10080 at 0.2 minutes
found line [Project] Loading completed in 73.975 seconds at 1.2 minutes
found line Obtained 20 stack frames. at 1.3 minutes
retcode is 0 after 1.3 minutes
dave@dave-1KCM 3DURP_AcceleratorCrash %