Unreal Engine Issues and Bug Tracker (UE-47758)

Description

This is a common crash on Mac in 4.16 and has occurred since at least 4.14.

User Descriptions

I added a character to a blank map and tried to save it.

Callstack from Log

LogEditorViewport: Clicking on Actor (LMB): StaticMeshActor (Wall4)
Cmd: EDIT COPY
Cmd: EDIT COPY
Cmd: EDIT PASTE
Cmd: EDIT COPY
Cmd: EDIT COPY
Cmd: EDIT PASTE
Cmd: EDIT COPY
Cmd: EDIT COPY
Cmd: EDIT PASTE
Cmd: EDIT COPY
Cmd: EDIT COPY
Cmd: EDIT PASTE
Cmd: EDIT COPY
Cmd: EDIT COPY
Cmd: EDIT PASTE
Cmd: EDIT COPY
Cmd: EDIT COPY
Cmd: EDIT PASTE
ogMac:Error: appError called: Assertion failed: Assertion failed: !bIsReentrant [File:/Users/build/Build/++UE4+Release-4.16+Compile/Sync/Engine/Source/Editor/UnrealEd/Private/FileHelpers.cpp] [Line: 395] 

LogCrashTracker: 

LogMac: === Critical error: ===
SIGSEGV: invalid attempt to access memory at address 0x3

LogMac: FGenericPlatformMisc::RaiseException(unsigned int) Address = 0x679200b  (filename not found) [in UE4Editor-Core.dylib]
FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0x698da2f  (filename not found) [in UE4Editor-Core.dylib]
FOutputDevice::Logf(wchar_t const*, ...) Address = 0x6a6e6cd  (filename not found) [in UE4Editor-Core.dylib]
FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0x69d493e  (filename not found) [in UE4Editor-Core.dylib]
SaveWorld(UWorld*, FString const*, wchar_t const*, wchar_t const*, bool, bool, FString&, bool, bool) Address = 0xe780280  (filename not found) [in UE4Editor-UnrealEd.dylib]
FEditorFileUtils::SaveLevel(ULevel*, FString const&, FString*) Address = 0xe7869b3  (filename not found) [in UE4Editor-UnrealEd.dylib]
FEditorFileUtils::SaveCurrentLevel() Address = 0xe7893e8  (filename not found) [in UE4Editor-UnrealEd.dylib]
TBaseStaticDelegateInstance<void ()>::ExecuteIfSafe() const Address = 0x21090707 (filename not found) [in UE4Editor-LevelEditor.dylib]
FUICommandList::ConditionalProcessCommandBindings(FKey, bool, bool, bool, bool, bool) const Address = 0xcce7021  (filename not found) [in UE4Editor-Slate.dylib]
FUICommandList::ProcessCommandBindings(FKeyEvent const&) const Address = 0xcce6865  (filename not found) [in UE4Editor-Slate.dylib]
SEditorViewport::OnKeyDown(FGeometry const&, FKeyEvent const&) Address = 0xec0b866  (filename not found) [in UE4Editor-UnrealEd.dylib]
SLevelViewport::OnKeyDown(FGeometry const&, FKeyEvent const&) Address = 0x211b2a3a (filename not found) [in UE4Editor-LevelEditor.dylib]
FSlateApplication::ProcessKeyDownEvent(FKeyEvent&) Address = 0xccab8d2  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::OnKeyDown(int, unsigned int, bool) Address = 0xcca9f98  (filename not found) [in UE4Editor-Slate.dylib]
FMacApplication::ProcessKeyDownEvent(FDeferredMacEvent const&, TSharedPtr<FMacWindow, (ESPMode)0>) Address = 0x695e0e4  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::ProcessEvent(FDeferredMacEvent const&) Address = 0x6954131  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::ProcessDeferredEvents(float) Address = 0x6951eaf  (filename not found) [in UE4Editor-Core.dylib]
FSlateApplication::TickPlatform(float) Address = 0xcc829db  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::Tick(ESlateTickType) Address = 0xcc81e14  (filename not found) [in UE4Editor-Slate.dylib]
TickSlate(TSharedPtr<SWindow, (ESPMode)0>) Address = 0xe75e075  (filename not found) [in UE4Editor-UnrealEd.dylib]
FFeedbackContextEditor::ProgressReported(float, FText) Address = 0xe75ea60  (filename not found) [in UE4Editor-UnrealEd.dylib]
FFeedbackContext::UpdateUI() Address = 0x6a5642f  (filename not found) [in UE4Editor-Core.dylib]
FSlowTask::EnterProgressFrame(float, FText) Address = 0x6ab1797  (filename not found) [in UE4Editor-Core.dylib]
UPackage::Save(UPackage*, UObject*, EObjectFlags, wchar_t const*, FOutputDevice*, FLinkerLoad*, bool, bool, unsigned int, ITargetPlatform const*, FDateTime const&, bool) Address = 0x772b394  (filename not found) [in UE4Editor-CoreUObject.dylib]
UEditorEngine::Save(UPackage*, UObject*, EObjectFlags, wchar_t const*, FOutputDevice*, FLinkerLoad*, bool, bool, unsigned int, ITargetPlatform const*, FDateTime const&, bool) Address = 0xe32778a  (filename not found) [in UE4Editor-UnrealEd.dylib]
UEditorEngine::SavePackage(UPackage*, UObject*, EObjectFlags, wchar_t const*, FOutputDevice*, FLinkerLoad*, bool, bool, unsigned int, ITargetPlatform const*, FDateTime const&, bool) Address = 0xe328a87  (filename not found) [in UE4Editor-UnrealEd.dylib]
UEditorEngine::Exec_Obj(wchar_t const*, FOutputDevice&) Address = 0xe3d13d7  (filename not found) [in UE4Editor-UnrealEd.dylib]
UEditorEngine::Exec(UWorld*, wchar_t const*, FOutputDevice&) Address = 0xe3d9729  (filename not found) [in UE4Editor-UnrealEd.dylib]
UUnrealEdEngine::Exec(UWorld*, wchar_t const*, FOutputDevice&) Address = 0xf05f88c  (filename not found) [in UE4Editor-UnrealEd.dylib]
SaveWorld(UWorld*, FString const*, wchar_t const*, wchar_t const*, bool, bool, FString&, bool, bool) Address = 0xe782672  (filename not found) [in UE4Editor-UnrealEd.dylib]
FEditorFileUtils::SaveLevel(ULevel*, FString const&, FString*) Address = 0xe7869b3  (filename not found) [in UE4Editor-UnrealEd.dylib]
FEditorFileUtils::SaveCurrentLevel() Address = 0xe7893e8  (filename not found) [in UE4Editor-UnrealEd.dylib]
TBaseStaticDelegateInstance<void ()>::ExecuteIfSafe() const Address = 0x21090707 (filename not found) [in UE4Editor-LevelEditor.dylib]
FUICommandList::ConditionalProcessCommandBindings(FKey, bool, bool, bool, bool, bool) const Address = 0xcce7021  (filename not found) [in UE4Editor-Slate.dylib]
FUICommandList::ProcessCommandBindings(FKeyEvent const&) const Address = 0xcce6865  (filename not found) [in UE4Editor-Slate.dylib]
SEditorViewport::OnKeyDown(FGeometry const&, FKeyEvent const&) Address = 0xec0b866  (filename not found) [in UE4Editor-UnrealEd.dylib]
SLevelViewport::OnKeyDown(FGeometry const&, FKeyEvent const&) Address = 0x211b2a3a (filename not found) [in UE4Editor-LevelEditor.dylib]
FSlateApplication::ProcessKeyDownEvent(FKeyEvent&) Address = 0xccab8d2  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::OnKeyDown(int, unsigned int, bool) Address = 0xcca9f98  (filename not found) [in UE4Editor-Slate.dylib]
FMacApplication::ProcessKeyDownEvent(FDeferredMacEvent const&, TSharedPtr<FMacWindow, (ESPMode)0>) Address = 0x695e0e4  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::ProcessEvent(FDeferredMacEvent const&) Address = 0x6954131  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::ProcessDeferredEvents(float) Address = 0x6951eaf  (filename not found) [in UE4Editor-Core.dylib]
FSlateApplication::TickPlatform(float) Address = 0xcc829db  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::Tick(ESlateTickType) Address = 0xcc81e14  (filename not found) [in UE4Editor-Slate.dylib]
FEngineLoop::Tick() Address = 0x66a280c  (filename not found) [in UE4Editor]
GuardedMain(wchar_t const*) Address = 0x66a8e12  (filename not found) [in UE4Editor]
-[UE4AppDelegate runGameThread:] Address = 0x66b701a  (filename not found) [in UE4Editor]
-[FCocoaGameThread main] Address = 0x6949346  (filename not found) [in UE4Editor-Core.dylib]
__NSThread__start__() Address = 0x901c68ad (filename not found) [in Foundation]
_pthread_body() Address = 0xa413c93b (filename not found) [in libsystem_pthread.dylib]
_pthread_body() Address = 0xa413c887 (filename not found) [in libsystem_pthread.dylib]
thread_start() Address = 0xa413c08d (filename not found) [in libsystem_pthread.dylib]

Steps to Reproduce

repro steps currently unknown

Callstack

UE4Editor-UnrealEd.dylib!SaveWorld()
UE4Editor-UnrealEd.dylib!FEditorFileUtils::SaveLevel()
UE4Editor-UnrealEd.dylib!FEditorFileUtils::SaveCurrentLevel()
UE4Editor-LevelEditor.dylib!TBaseStaticDelegateInstance<void ()>::ExecuteIfSafe()
UE4Editor-Slate.dylib!FUICommandList::ConditionalProcessCommandBindings()
UE4Editor-Slate.dylib!FUICommandList::ProcessCommandBindings()
UE4Editor-UnrealEd.dylib!SEditorViewport::OnKeyDown()
UE4Editor-LevelEditor.dylib!SLevelViewport::OnKeyDown()
UE4Editor-Slate.dylib!FSlateApplication::ProcessKeyDownEvent()
UE4Editor-Slate.dylib!FSlateApplication::OnKeyDown()
UE4Editor-Core.dylib!FMacApplication::ProcessKeyDownEvent(FDeferredMacEvent const&, TSharedPtr<FMacWindow,()
UE4Editor-Core.dylib!FMacApplication::ProcessEvent()
UE4Editor-Core.dylib!FMacApplication::ProcessDeferredEvents()
UE4Editor-Slate.dylib!FSlateApplication::TickPlatform()
UE4Editor-Slate.dylib!FSlateApplication::Tick()
UE4Editor-UnrealEd.dylib!TickSlate(TSharedPtr<SWindow,()
UE4Editor-UnrealEd.dylib!FFeedbackContextEditor::ProgressReported()
UE4Editor-Core.dylib!FFeedbackContext::UpdateUI()
UE4Editor-Core.dylib!FSlowTask::EnterProgressFrame()
UE4Editor-CoreUObject.dylib!UPackage::Save()
UE4Editor-UnrealEd.dylib!UEditorEngine::Save()
UE4Editor-UnrealEd.dylib!UEditorEngine::SavePackage()
UE4Editor-UnrealEd.dylib!UEditorEngine::Exec_Obj()
UE4Editor-UnrealEd.dylib!UEditorEngine::Exec()
UE4Editor-UnrealEd.dylib!UUnrealEdEngine::Exec()
UE4Editor-UnrealEd.dylib!SaveWorld()
UE4Editor-UnrealEd.dylib!FEditorFileUtils::SaveLevel()
UE4Editor-UnrealEd.dylib!FEditorFileUtils::SaveCurrentLevel()
UE4Editor-LevelEditor.dylib!TBaseStaticDelegateInstance<void ()>::ExecuteIfSafe()
UE4Editor-Slate.dylib!FUICommandList::ConditionalProcessCommandBindings()
UE4Editor-Slate.dylib!FUICommandList::ProcessCommandBindings()
UE4Editor-UnrealEd.dylib!SEditorViewport::OnKeyDown()
UE4Editor-LevelEditor.dylib!SLevelViewport::OnKeyDown()
UE4Editor-Slate.dylib!FSlateApplication::ProcessKeyDownEvent()
UE4Editor-Slate.dylib!FSlateApplication::OnKeyDown()
UE4Editor-Core.dylib!FMacApplication::ProcessKeyDownEvent(FDeferredMacEvent const&, TSharedPtr<FMacWindow,()
UE4Editor-Core.dylib!FMacApplication::ProcessEvent()
UE4Editor-Core.dylib!FMacApplication::ProcessDeferredEvents()
UE4Editor-Slate.dylib!FSlateApplication::TickPlatform()
UE4Editor-Slate.dylib!FSlateApplication::Tick()
UE4Editor!FEngineLoop::Tick()
UE4Editor!GuardedMain()
UE4Editor!<Unknown>
UE4Editor-Core.dylib!<Unknown>
Foundation!Unknown()
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>

Community References

Fix UE-51650

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An error occurred while trying to generate project files !?

I can't open my map from the editor.

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Fixed

Component	UE - Platform - Apple
Affects Versions	4.14, 4.15, 4.16
Target Fix	4.17

Fix Commit	3411164
Main Commit	3621569
Release Commit	3515877

Created	Jul 27, 2017
Resolved	Aug 2, 2017
Updated	Apr 27, 2018

View Jira Issue

UE-47758

[CrashReport] Assertion failed: !bIsReentrant - UE4Editor-UnrealEd.dylib!SaveWorld()

[CrashReport] Assertion failed: !bIsReentrant - UE4Editor-UnrealEd.dylib!SaveWorld()

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