This is an infrequent Mac crash that has occurred for a few users since at least 4.16. Users have not provided any descriptions of their actions when the crash occurred.
The callstack shares similarities to two Windows crashes
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Callstack from Log
-- imported successfully Failed to load /Game/***/***_Grass/grass_04/Cattail_Desktop_Branches_Mat.Cattail_Desktop_Branches_Mat Referenced by Cattail_Desktop Failed to load /Game/***/***_Grass/grass_04/Cattail_Desktop_Leaves_Mat.Cattail_Desktop_Leaves_Mat Referenced by Cattail_Desktop Failed to load /Game/***/***_Grass/grass_04/Cattail_Desktop_Fronds_Mat.Cattail_Desktop_Fronds_Mat Referenced by Cattail_Desktop Failed to load /Game/***/***_Grass/grass_04/Cattail_Desktop_Billboard_Mat.Cattail_Desktop_Billboard_Mat Referenced by Cattail_Desktop Performing atomic reimport of [/Users/***/Doc/***/***/***/Unreal En/MyProject/Content/Content/***/***_Grass/grass_04/Cattail_Desktop.srt] FactoryCreateFile: StaticMesh with ReimportSpeedTreeFactory (0 0 /Users/***/Doc/***/***/***/Unreal En/MyProject/Content/Content/***/***_Grass/grass_04/Cattail_Desktop.srt) === Critical error: === SIGSEGV: invalid attempt to access memory at address 0x0 USpeedTreeImportFactory::FactoryCreateBinary(UClass*, UObject*, FName, EObjectFlags, UObject*, wchar_t const*, unsigned char const*&, unsigned char const*, FFeedbackContext*) Address = 0x817ca525 (filename not found) [in UE4Editor-SpeedTreeImporter.dylib] UFactory::FactoryCreateFile(UClass*, UObject*, FName, EObjectFlags, FString const&, wchar_t const*, FFeedbackContext*, bool&) Address = 0xdb91c13 (filename not found) [in UE4Editor-UnrealEd.dylib] UFactory::ImportObject(UClass*, UObject*, FName, EObjectFlags, FString const&, wchar_t const*, bool&) Address = 0xdb92787 (filename not found) [in UE4Editor-UnrealEd.dylib] UReimportSpeedTreeFactory::Reimport(UObject*) Address = 0x817b878d (filename not found) [in UE4Editor-SpeedTreeImporter.dylib] FReimportManager::Reimport(UObject*, bool, bool, FString, FReimportHandler*) Address = 0xd8be24f (filename not found) [in UE4Editor-UnrealEd.dylib] FContentDirectoryMonitor::ReimportAsset(UObject*, FString const&, TArray<UPackage*, FDefaultAllocator>&, FReimportFeedbackContext&) Address = 0xd4e0fd5 (filename not found) [in UE4Editor-UnrealEd.dylib] FContentDirectoryMonitor::ProcessModifications(DirectoryWatcher::FTimeLimit const&, TArray<UPackage*, FDefaultAllocator>&, FReimportFeedbackContext&) Address = 0xd4d973f (filename not found) [in UE4Editor-UnrealEd.dylib] FAutoReimportManager::ProcessModifications(DirectoryWatcher::FTimeLimit const&) Address = 0xd4d8eb8 (filename not found) [in UE4Editor-UnrealEd.dylib] UE4Function_Private::TFunctionRefCaller<FAutoReimportManager::FAutoReimportManager()::$_39, TOptional<ECurrentState> (DirectoryWatcher::FTimeLimit const&)>::Call(void*, DirectoryWatcher::FTimeLimit const&) Address = 0xd57d9b1 (filename not found) [in UE4Editor-UnrealEd.dylib] FStateMachine<ECurrentState>::Tick(DirectoryWatcher::FTimeLimit const&) Address = 0xd4de20b (filename not found) [in UE4Editor-UnrealEd.dylib] FAutoReimportManager::Tick(float) Address = 0xd4ddf80 (filename not found) [in UE4Editor-UnrealEd.dylib] UEditorEngine::Tick(float, bool) Address = 0xd9bc4f4 (filename not found) [in UE4Editor-UnrealEd.dylib] UUnrealEdEngine::Tick(float, bool) Address = 0xe69e1dc (filename not found) [in UE4Editor-UnrealEd.dylib] FEngineLoop::Tick() Address = 0x4dade75 (filename not found) [in UE4Editor] GuardedMain(wchar_t const*) Address = 0x4db5c22 (filename not found) [in UE4Editor] -[UE4AppDelegate runGameThread:] Address = 0x4dc35d0 (filename not found) [in UE4Editor] -[FCocoaGameThread main] Address = 0x5089cc6 (filename not found) [in UE4Editor-Core.dylib] __NSThread__start__() Address = 0xb0e688ad (filename not found) [in Foundation] _pthread_body() Address = 0xc4dde93b (filename not found) [in libsystem_pthread.dylib] _pthread_body() Address = 0xc4dde887 (filename not found) [in libsystem_pthread.dylib] thread_start() Address = 0xc4dde08d (filename not found) [in libsystem_pthread.dylib]
repro steps currently unknown
SEGV_MAPERR at 0x0 UE4Editor-SpeedTreeImporter.dylib!USpeedTreeImportFactory::FactoryCreateBinary() UE4Editor-UnrealEd.dylib!UFactory::FactoryCreateFile() UE4Editor-UnrealEd.dylib!UFactory::ImportObject() UE4Editor-SpeedTreeImporter.dylib!UReimportSpeedTreeFactory::Reimport() UE4Editor-UnrealEd.dylib!FReimportManager::Reimport() UE4Editor-UnrealEd.dylib!FContentDirectoryMonitor::ReimportAsset() UE4Editor-UnrealEd.dylib!FContentDirectoryMonitor::ProcessModifications() UE4Editor-UnrealEd.dylib!FAutoReimportManager::ProcessModifications() UE4Editor-UnrealEd.dylib!UE4Function_Private::TFunctionRefCaller<FAutoReimportManager::FAutoReimportManager()::$_39, TOptional<ECurrentState> (DirectoryWatcher::FTimeLimit const&)>::Call() UE4Editor-UnrealEd.dylib!FStateMachine<ECurrentState>::Tick() UE4Editor-UnrealEd.dylib!FAutoReimportManager::Tick() UE4Editor-UnrealEd.dylib!UEditorEngine::Tick() UE4Editor-UnrealEd.dylib!UUnrealEdEngine::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>
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-49499 in the post.