Unity stuck at Reloading Domain

Unity Engine
,
1

Occurs randomly, whenever code gets changed, once every 2-3 recompiles

Unity version: 2023.1.0a25.2386.4619
Visual studio 2019 community

Editor.log:
processors: zzzUnity.Burst.CodeGen.BurstILPostProcessor

running zzzUnity.Burst.CodeGen.BurstILPostProcessor
[886/889 0s] CopyFiles Library/ScriptAssemblies/Assembly-CSharp.pdb
[887/889 0s] CopyFiles Library/ScriptAssemblies/Assembly-CSharp.dll
*** Tundra build success (1.06 seconds), 6 items updated, 889 evaluated
Reloading assemblies after forced synchronous recompile.
Begin MonoManager ReloadAssembly
Total cache size 55833648
Total cache size after purge 55833648

Tried all solutions found searching online, didn’t solve the issue

2

Tried:

  • reverting back to old versions of unity 2021, 2020
  • editing and disabling domain reload
  • deleting lib/obj/… folders
  • deleting unity cache
  • removing extra unused packages from project
  • trying with VS Code
  • creating new scene
  • cloning project fresh from git
  • disabling auto refresh (then occasionally it gets stuck when I do ctrl+r)
  • disabling/enabling breakpoints while in run mode
  • editing/saving files while in play mode
3

8735043--1182501--upload_2023-1-16_23-30-17.png
8735043--1182501--upload_2023-1-16_23-30-17.png779×327 24 KB

8735043--1182501--upload_2023-1-16_23-30-17.png
8735043--1182501--upload_2023-1-16_23-30-17.png779×327 24 KB

4

SOLUTION

After several days of trying to isolate the problem, the culprit was found.

MYSQL.DATA.DLL - CONNECTION WASN’T PROPERLY CLOSED - a faulty return statement skipped closing the connection. This caused unity to hang on next code recompile.

8737554--1183173--upload_2023-1-17_22-4-50.png

I really hope this helps someone one day and would really appreciate if Unity team would be able to somehow log which file caused the hanging so we can isolate the mistakes faster!

3 Likes
5

I had the same problem, the project was quite simple and there were no databases or calls to third-party libraries. I tried many different ways from restarting the computer and updating the engine version to clearing the cache and project files. But in the end, running the hub with administrator rights helped.

1 Like