Unreal Engine Issues

UE-140090

Compiling twice then pressing play/stop after creating a c++ Game Instance causes a crash

Compiling twice then pressing play/stop after creating a c++ Game Instance causes a crash

Description

This is not a regression.

After creating a C++ based Game Instance the Editor crashes if you compile twice then play and stop.

Steps to Reproduce
  1. Create a C++ Blank Project w/o Starter Content
  2. Create a C++ Class derived from GameInstance
    1. In the Content Browser within the C++ Classes folder right-click then select New C++ Class
    2. Select All Classes in the dialog
    3. Search for then select GameInstance
    4. Press Next then Create Class
    5. Wait for VS to open and press Reload All if prompted
  3. Press Compile then wait for it successfully finish
  4. Press Compile again then wait for it to successfully finish
  5. Press Play then wait for it fully start
  6. Press Stop

Expected Results:
PIE stops, and user can continue working in the Editor.

Actual Results:
Editor crashes.

Callstack
[2022.01.24-20.35.35:451][521]LogWindows: Error: === Critical error: ===
[2022.01.24-20.35.35:451][521]LogWindows: Error: 
[2022.01.24-20.35.35:451][521]LogWindows: Error: Fatal error: [File:D:/build/++UE5/Sync/Engine/Source/Runtime/Core/Private/Windows/WindowsPlatformMisc.cpp] [Line: 476] 
[2022.01.24-20.35.35:451][521]LogWindows: Error: Pure virtual function being called
[2022.01.24-20.35.35:451][521]LogWindows: Error: 
[2022.01.24-20.35.35:451][521]LogWindows: Error: 
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc89b42184 UnrealEditor-Core.dll!PureCallHandler() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformMisc.cpp:478]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffcf3e36c44 VCRUNTIME140.dll!UnknownFunction []
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc9f2565f4 UnrealEditor-CoreUObject.dll!UGCObjectReferencer::AddReferencedObjects() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Misc\GCObjectReferencer.cpp:27]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc9f3bbfde UnrealEditor-CoreUObject.dll!TFastReferenceCollector<FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,1>::ProcessObjectArray() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\FastReferenceCollector.h:890]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc9f392a11 UnrealEditor-CoreUObject.dll!TFastReferenceCollector<FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,1>::FCollectorTaskQueue::DoTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\FastReferenceCollector.h:403]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc9f39b7e0 UnrealEditor-CoreUObject.dll!TGraphTask<TFastReferenceCollector<FGCReferenceProcessor<1>,FGCCollector<1>,FGCArrayPool,1>::FCollectorTaskProcessorTask>::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\TaskGraphInterfaces.h:960]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc894e759c UnrealEditor-Core.dll!<lambda_a1df8d36345249e213dfea2f6e603d11>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:268]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc894ef1f2 UnrealEditor-Core.dll!LowLevelTasks::TTaskDelegate<48,bool>::TTaskDelegateImpl<<lambda_a1df8d36345249e213dfea2f6e603d11>,0>::CallAndMove() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\TaskDelegate.h:156]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc894fac0c UnrealEditor-Core.dll!LowLevelTasks::FTask::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:351]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc894dde2d UnrealEditor-Core.dll!LowLevelTasks::FScheduler::TryExecuteTaskFrom<&LowLevelTasks::TLocalQueueRegistry<1024>::TLocalQueue::DequeueGlobal,0>() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:219]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc89524eba UnrealEditor-Core.dll!LowLevelTasks::FScheduler::WorkerMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:254]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc894ec88a UnrealEditor-Core.dll!UE4Function_Private::TFunctionRefCaller<<lambda_307fc9362df36c938efbf939ea95ce8f>,void __cdecl(void)>::Call() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Templates\Function.h:548]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc8962603c UnrealEditor-Core.dll!FThreadImpl::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\HAL\Thread.cpp:65]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc89b4394b UnrealEditor-Core.dll!FRunnableThreadWin::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:146]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffc89b3c640 UnrealEditor-Core.dll!FRunnableThreadWin::GuardedRun() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:76]
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffd026c7bd4 KERNEL32.DLL!UnknownFunction []
[2022.01.24-20.35.35:451][521]LogWindows: Error: [Callstack] 0x00007ffd02c6ced1 ntdll.dll!UnknownFunction []
[2022.01.24-20.35.35:451][521]LogWindows: Error: 
[2022.01.24-20.35.35:451][521]LogWindows: Error: Crash in runnable thread Background Worker #59
Community References

Any GameInstance Subclass Breaks Hot Reload

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Cannot Reproduce
ComponentUE - Foundation - Cpp Tools - Live Coding
Affects Versions5.0
Target Fix5.0
CreatedJan 24, 2022
ResolvedJan 28, 2022
UpdatedJan 28, 2022