The Editor hangs roughly 20% of the time during Continuous Integration (CI) builds. The hang happens soon after the launch of the building process. Nothing is logged in the Editor.log file. Last lines that are logged in the project build log file are always these:

{noformat}[2023-07-18 10:26:59.656] Mono: successfully reloaded assembly
[2023-07-18 10:26:59.656] - Completed reload, in 7.858 seconds
[2023-07-18 10:26:59.656] Domain Reload Profiling:
[2023-07-18 10:26:59.656] ReloadAssembly (7859ms)
[2023-07-18 10:26:59.656] BeginReloadAssembly (151ms)
[2023-07-18 10:26:59.656] ExecutionOrderSort (0ms)
[2023-07-18 10:26:59.656] DisableScriptedObjects (7ms)
[2023-07-18 10:26:59.656] BackupInstance (0ms)
[2023-07-18 10:26:59.657] ReleaseScriptingObjects (1ms)
[2023-07-18 10:26:59.657] CreateAndSetChildDomain (34ms)
[2023-07-18 10:26:59.657] EndReloadAssembly (7570ms)
[2023-07-18 10:26:59.657] LoadAssemblies (701ms)
[2023-07-18 10:26:59.657] RebuildTransferFunctionScriptingTraits (0ms)
[2023-07-18 10:26:59.657] SetupTypeCache (750ms)
[2023-07-18 10:26:59.657] ReleaseScriptCaches (3ms)
[2023-07-18 10:26:59.657] RebuildScriptCaches (261ms)
[2023-07-18 10:26:59.657] SetupLoadedEditorAssemblies (5739ms)
[2023-07-18 10:26:59.657] LogAssemblyErrors (0ms)
[2023-07-18 10:26:59.657] InitializePlatformSupportModulesInManaged (44ms)
[2023-07-18 10:26:59.657] SetLoadedEditorAssemblies (0ms)
[2023-07-18 10:26:59.657] RefreshPlugins (297ms)
[2023-07-18 10:26:59.657] BeforeProcessingInitializeOnLoad (220ms)
[2023-07-18 10:26:59.657] ProcessInitializeOnLoadAttributes (5139ms)
[2023-07-18 10:26:59.657] ProcessInitializeOnLoadMethodAttributes (32ms)
[2023-07-18 10:26:59.657] AfterProcessingInitializeOnLoad (5ms)
[2023-07-18 10:26:59.657] EditorAssembliesLoaded (0ms)
[2023-07-18 10:26:59.657] ExecutionOrderSort2 (0ms)
[2023-07-18 10:26:59.657] AwakeInstancesAfterBackupRestoration (6ms)
[2023-07-18 10:26:59.657] Platform modules already initialized, skipping
[2023-07-18 10:26:59.657] Registering precompiled user dll's ...
[2023-07-18 10:26:59.657] Registered in 0.026388 seconds.{noformat}

The user reproduced the issue without {{-batchmode}} and was able to capture a picture (attached) of the loading dialog while it was hung.

The user added logging to both {{OnPreprocessBuild}} and all of the {{AssetPreprocessing}} Callbacks and none of them fired, so the root of the hang is before all of them.

The user pulled a full crash dump (attached) since the issue is intermittent and appears to only happen on Windows.