EditorApplication.update with Resources.FindObjectsOfTypeAll crashes when going in playmode

Since 2021 we experience crashes produced by our tools. They worked fine in earlier Unity Versions
We are currently working on 2021.2.4f1

The "EditorWindow.HasOpenInstances" produces the crash if the user enters/exits the playmode.
The bug occurs very inconsistently and can't be easily reproduced.
We had multiple scripts hooking up in EditorApplication.update and calling the underlying "Resources.FindObjectsOfTypeAll" all of them produced atleast one crash.

Our crash stacktrace looks like this:

Code (CSharp):

1. ========== OUTPUTTING STACK TRACE ==================
2.  
3. 0x00007FF815214F69 (KERNELBASE) RaiseException
4. 0x00007FFFC40F064C (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\utils\mono-log-common.c:143] mono_log_write_logfile
5. 0x00007FFFC40DC4A2 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\eglib\goutput.c:172] monoeg_g_logv_nofree
6. 0x00007FFFC40DC57C (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\eglib\goutput.c:215] monoeg_assertion_message
7. 0x00007FFFC40DC5E6 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\eglib\goutput.c:239] mono_assertion_message_unreachable
8. 0x00007FFFC414E826 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\class-accessors.c:86] mono_class_get_flags
9. 0x00007FFFC4144195 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\class-init.c:253] mono_class_setup_fields
10. 0x00007FFFC4148852 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\class-init.c:1768] init_sizes_with_info
11. 0x00007FFFC414B021 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\class-init.c:2835] mono_class_init_internal
12. 0x00007FFFC413D3FD (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\class.c:3530] mono_class_is_subclass_of_internal
13. 0x00007FFFC4238123 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\external-only.c:319] mono_class_is_subclass_of
14. 0x00007FF6648CD97D (Unity) scripting_class_is_subclass_of
15. 0x00007FF6648C7B9E (Unity) Scripting::FindObjectsOfType
16. 0x00007FF6647E0555 (Unity) Resources_Bindings::FindObjectsOfTypeAll
17. 0x00007FF663BE3A1E (Unity) ResourcesAPIInternal_CUSTOM_FindObjectsOfTypeAll
18. 0x0000026EED1CC46A (Mono JIT Code) (wrapper managed-to-native) UnityEngine.ResourcesAPIInternal:FindObjectsOfTypeAll (System.Type)
19. 0x0000026EED1CC3B3 (Mono JIT Code) UnityEngine.ResourcesAPI:FindObjectsOfTypeAll (System.Type)
20. 0x0000026EED1CC1EB (Mono JIT Code) UnityEngine.Resources:FindObjectsOfTypeAll (System.Type)
21. 0x0000026F67408D6B (Mono JIT Code) UnityEditor.EditorWindow:HasOpenInstances<T_REF> ()
22. 0x00000270800916FB (Mono JIT Code) [...\Assets\Scripts\BuildTest\Editor\BuildMachineTest.cs:242] BuildTest.BuildMachineTest:OnUpdate ()
23. 0x000002708004F0F0 (Mono JIT Code) UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()
24. 0x0000026F6C641CB5 (Mono JIT Code) (wrapper runtime-invoke) object:runtime_invoke_void (object,intptr,intptr,intptr)
25. 0x00007FFFC42FE034 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\mini\mini-runtime.c:3445] mono_jit_runtime_invoke
26. 0x00007FFFC423E724 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\object.c:3064] do_runtime_invoke
27. 0x00007FFFC423E8BC (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\object.c:3111] mono_runtime_invoke
28. 0x00007FF6648CE5F4 (Unity) scripting_method_invoke
29. 0x00007FF6648C9274 (Unity) ScriptingInvocation::Invoke
30. 0x00007FF6648C2C25 (Unity) ScriptingInvocation::Invoke<void>
31. 0x00007FF6649E39BB (Unity) Scripting::UnityEditor::EditorApplicationProxy::Internal_CallUpdateFunctions
32. 0x00007FF665316CC2 (Unity) SceneTracker::Update
33. 0x00007FF6654C43E6 (Unity) Application::TickTimer
34. 0x00007FF6658FFD0A (Unity) MainMessageLoop
35. 0x00007FF66590452B (Unity) WinMain
36. 0x00007FF666C13702 (Unity) __scrt_common_main_seh
37. 0x00007FF817397034 (KERNEL32) BaseThreadInitThunk
38. 0x00007FF817A22651 (ntdll) RtlUserThreadStart
39.  
40. ========== END OF STACKTRACE ===========

The code referenced:

Code (CSharp):

1.  
2. static BuildMachineTest()
3. {
4.      EditorApplication.update -= OnUpdate;
5.      EditorApplication.update += OnUpdate;
6. }
7.  
8. private static void OnUpdate()
9. {
10.      if (EditorWindow.HasOpenInstances<BuildPlayerWindow>()){...}
11. }
12.  

Is this a known issue? Am i using the editor callbacks wrong?

Thanks for your help!

 

Same here !
We have multiple tools on our build machines, all of them worked in 2020.3.10 and now that we are in 2021.3.13 crashes occur systematically. So far we observed this :
- Crashes happen between 30 min and +4 hours
- It happens on different tools
- For a given tool the stack traces vary (Native Crash Stack Trace)
- It happens on different computers
- Processed assets vary
- Enabling 'AssetPipeline Parallel Import' doesn't change anything.
- Also happen in 2021.3.14 (with more issues related to the AssetDatabase)