System.AccessViolationException on Unity: 2021.3.45f2 BepInEx build: 6.0.0-be.738

[mx2048]

Unity: 2021.3.45f2, metadata v31
BepInEx build: 6.0.0-be.738
Repro: vanilla install, no plugins, crash in Il2CppInterop.Runtime.Injection.Hooks.Class_GetFieldDefaultValue_Hook.Hook
Video game: Vagrus, version 1.2.50.1024B

ErrorLog.log:

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at Il2CppInterop.Runtime.Injection.Hooks.Class_GetFieldDefaultValue_Hook.Hook(Il2CppInterop.Runtime.Runtime.Il2CppFieldInfo*, Il2CppInterop.Runtime.Runtime.Il2CppTypeStruct* ByRef)

LogOutput.log:

[Message: Preloader] BepInEx 6.0.0-be.738 - Vagrus (10/25/2025 2:29:48 AM)
[Message: Preloader] Built from commit af0cba71fb69324aa4dfd651422bfa020309ce15
[Info : BepInEx] System platform: Windows 10 64-bit
[Info : BepInEx] Process bitness: 64-bit (x64)
[Info : BepInEx] Running under Unity 2021.3.45f2
[Info : BepInEx] Runtime version: 6.0.7
[Info : BepInEx] Runtime information: .NET 6.0.7
[Message:InteropManager] Downloading unity base libraries https://unity.bepinex.dev/libraries/2021.3.45.zip
[Message:InteropManager] Extracting downloaded unity base libraries
[Message:InteropManager] Running Cpp2IL to generate dummy assemblies from F:\GAMES\STEAM\steamapps\common\Vagrus - The Riven Realms\Vagrus_Data/il2cpp_data/Metadata/global-metadata.dat
[Info : Cpp2IL] [Library] Initializing Metadata...
[Info : Cpp2IL] [Library] Using actual IL2CPP Metadata version 31
[Info : Cpp2IL] [Library] Initialized Metadata in 254ms
[Info : Cpp2IL] [Library] Using binary type Portable Executable (from LibCpp2IL)
[Info : Cpp2IL] [Library] Searching Binary for Required Data...
[Info : Cpp2IL] [Library] Got Binary codereg: 0x1830D4DE0, metareg: 0x1836506A0 in 119ms.
[Info : Cpp2IL] [Library] Initializing Binary...
[Info : Cpp2IL] [Library] Initialized Binary in 96ms
[Info : Cpp2IL] [Library] Mapping pointers to Il2CppMethodDefinitions...
[Info : Cpp2IL] [Library] Processed 145818 OK (73ms)
[Info : Cpp2IL] [Program] Creating application model...
[Info : Cpp2IL] [Program] Application model created in 1680.4077ms
[Info :InteropManager] Cpp2IL finished in 00:00:06.8782589
[Info :InteropManager] Generating interop assemblies
[Info :Il2CppInteropGen] Reading assemblies...
[Info :Il2CppInteropGen] Done in 00:00:00.0055804
[Info :Il2CppInteropGen] Reading unity assemblies...
[Info :Il2CppInteropGen] Done in 00:00:00.0840441
[Info :Il2CppInteropGen] Creating rewrite assemblies...
[Info :Il2CppInteropGen] Done in 00:00:00.0118063
[Info :Il2CppInteropGen] Computing renames...
[Info :Il2CppInteropGen] Done in 00:00:00.0426762
[Info :Il2CppInteropGen] Creating typedefs...
[Info :Il2CppInteropGen] Done in 00:00:00.0326819
[Info :Il2CppInteropGen] Computing struct blittability...
[Info :Il2CppInteropGen] Done in 00:00:00.0298757
[Info :Il2CppInteropGen] Filling typedefs...
[Info :Il2CppInteropGen] Done in 00:00:00.1042038
[Info :Il2CppInteropGen] Filling generic constraints...
[Info :Il2CppInteropGen] Done in 00:00:00.0033520
[Info :Il2CppInteropGen] Creating members...
[Info :Il2CppInteropGen] Done in 00:00:00.7737017
[Info :Il2CppInteropGen] Scanning method cross-references...
[Info :Il2CppInteropGen] Done in 00:00:00.7360205
[Info :Il2CppInteropGen] Finalizing method declarations...
[Info :Il2CppInteropGen] Done in 00:00:01.7956488
[Info :Il2CppInteropGen] 69 total potentially dead methods
[Info :Il2CppInteropGen] Filling method parameters...
[Info :Il2CppInteropGen] Done in 00:00:00.7914738
[Info :Il2CppInteropGen] Creating static constructors...
[Info :Il2CppInteropGen] Done in 00:00:00.2893752
[Info :Il2CppInteropGen] Creating value type fields...
[Info :Il2CppInteropGen] Done in 00:00:00.0467963
[Info :Il2CppInteropGen] Creating enums...
[Info :Il2CppInteropGen] Done in 00:00:00.0710419
[Info :Il2CppInteropGen] Creating IntPtr constructors...
[Info :Il2CppInteropGen] Done in 00:00:00.0596015
[Info :Il2CppInteropGen] Creating non-blittable struct constructors...
[Info :Il2CppInteropGen] Done in 00:00:00.0162662
[Info :Il2CppInteropGen] Creating generic method static constructors...
[Info :Il2CppInteropGen] Done in 00:00:00.0646336
[Info :Il2CppInteropGen] Creating field accessors...
[Info :Il2CppInteropGen] Done in 00:00:01.7313324
[Info :Il2CppInteropGen] Filling methods...
[Info :Il2CppInteropGen] Done in 00:00:00.8519633
[Info :Il2CppInteropGen] Generating implicit conversions...
[Info :Il2CppInteropGen] Done in 00:00:00.0179548
[Info :Il2CppInteropGen] Implementing awaiters...
[Info :Il2CppInteropGen] Type Unity.Services.Core.Internal.TaskAsyncOperation was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name.
[Info :Il2CppInteropGen] Type System.Threading.Tasks.ForceAsyncAwaiter was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name.
[Info :Il2CppInteropGen] Type System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name.
[Info :Il2CppInteropGen] Type System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable1+ConfiguredValueTaskAwaiter was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name. [Info :Il2CppInteropGen] Type System.Runtime.CompilerServices.ValueTaskAwaiter was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name. [Info :Il2CppInteropGen] Type System.Runtime.CompilerServices.ValueTaskAwaiter1 was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name.
[Info :Il2CppInteropGen] Type System.Runtime.CompilerServices.TaskAwaiter was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name.
[Info :Il2CppInteropGen] Type System.Runtime.CompilerServices.TaskAwaiter1 was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name. [Info :Il2CppInteropGen] Type System.Runtime.CompilerServices.ConfiguredTaskAwaitable1+ConfiguredTaskAwaiter was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name.
[Info :Il2CppInteropGen] Type System.Runtime.CompilerServices.YieldAwaitable+YieldAwaiter was found to implement INotifyCompletion, but no suitable method was found. 0 method(s) were found with the required name.
[Info :Il2CppInteropGen] Done in 00:00:00.0076130
[Info :Il2CppInteropGen] Creating properties...
[Info :Il2CppInteropGen] Done in 00:00:00.2057049
[Info :Il2CppInteropGen] Unstripping types...
[Info :Il2CppInteropGen] Done in 00:00:00.0432295
[Info :Il2CppInteropGen] Unstripping fields...
[Info :Il2CppInteropGen] Restored 420 fields
[Info :Il2CppInteropGen] Failed to restore 2 fields
[Info :Il2CppInteropGen] Done in 00:00:00.0068904
[Info :Il2CppInteropGen] Unstripping methods...
[Info :Il2CppInteropGen] Restored 13257 methods
[Info :Il2CppInteropGen] Failed to restore 1020 methods
[Info :Il2CppInteropGen] Done in 00:00:00.4967342
[Info :Il2CppInteropGen] Unstripping method bodies...
[Info :Il2CppInteropGen] IL unstrip statistics: 7041 successful, 1231 failed
[Info :Il2CppInteropGen] Done in 00:00:00.1501567
[Info :Il2CppInteropGen] Writing xref cache...
[Info :Il2CppInteropGen] Done in 00:00:00.5137233
[Info :Il2CppInteropGen] Writing assemblies...
[Info :Il2CppInteropGen] Done in 00:00:04.8789059
[Info :Il2CppInteropGen] Writing method pointer map...
[Info :Il2CppInteropGen] Done in 00:00:00.0427882
[Info :Il2CppInteropGen] Clearing static data...
[Info :Il2CppInteropGen] Done in 00:00:00.0000058
[Info :Il2CppInteropGen] Done!
[Info : Preloader] 0 patcher plugins loaded
[Info : Preloader] 0 assemblies discovered
[Message:AssemblyPatcher] Executing 0 patch(es)
[Message: BepInEx] Chainloader initialized
[Warning:Il2CppInterop] Class::Init signatures have been exhausted, using a substitute!
[Info :Il2CppInterop] Registered mono type Il2CppInterop.Runtime.DelegateSupport+Il2CppToMonoDelegateReference in il2cpp domain
[Info : BepInEx] 0 plugins to load
[Message: BepInEx] Chainloader startup complete

[mx2048]

Temporary "fix":
Edit file BepInEx\config\BepInEx.cfg
Set
UnityLogListening = false

[DevKaiE]

@mx2048 This does not fix the issue for me. Game is Football Manager 26. Uses Denuvo.

Setting breakpad minidump AppID = 3551340
SteamInternal_SetMinidumpSteamID: Caching Steam ID: 76561198184885295 [API loaded no]
SteamInternal_SetMinidumpSteamID: Caching Steam ID: 76561198184885295 [API loaded no]
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at Il2CppInterop.Runtime.Injection.Hooks.GenericMethod_GetMethod_Hook.Hook(Il2CppInterop.Runtime.Runtime.Il2CppGenericMethod*, Boolean)

[Valerio-Corso]

Temporary "fix": Edit file BepInEx\config\BepInEx.cfg Set UnityLogListening = false

this is only a partial solution and many plugins won't work, or so it happens in FM26, so far I got around it by commenting: InjectorHelpers.GenericMethodGetMethodHook.ApplyHook();

this also mean you can set the logListening back to true

@DevKaiE