This is a common Mac crash occurring in the 4.16.1 release. I have not found any evidence of it occurring on Windows.
The callstack closely matches [Link Removed], which was briefly experienced by QA in 4.16.0, but then could not be reproduced later.
Users have not provided any descriptions, so additional information is currently unavailable.
Callstack from log
LogStreaming:Error: Couldn't find file for package /Engine/EngineDamageTypes/DmgTypeBP_Environmental requested by async loading code. NameToLoad: /Engine/EngineDamageTypes/DmgTypeBP_Environmental Error: CDO Constructor (WorldSettings): Failed to find /Engine/EngineDamageTypes/DmgTypeBP_Environmental.DmgTypeBP_Environmental_C LogStreaming:Error: Couldn't find file for package /Engine/EngineMaterials/WorldGridMaterial requested by async loading code. NameToLoad: /Engine/EngineMaterials/WorldGridMaterial LogMac:Error: appError called: Assertion failed: Assertion failed: GDefaultMaterials[Domain] != NULL [File:/Users/build/Build/++UE4+Release-4.16+Compile/Sync/Engine/Source/Runtime/Engine/Private/Materials/Material.cpp] [Line: 433] Cannot load default material 'engine-ini:/Script/Engine.Engine.DefaultMaterialName' LogMac: === Critical error: === SIGSEGV: invalid attempt to access memory at address 0x3 LogMac: FGenericPlatformMisc::RaiseException(unsigned int) Address = 0xb48882b (filename not found) [in MyProject] FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0xb62a5a4 (filename not found) [in MyProject] FOutputDevice::Logf(wchar_t const*, ...) Address = 0xb6be10d (filename not found) [in MyProject] FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0xb65cd8e (filename not found) [in MyProject] UMaterialInterface::InitDefaultMaterials() Address = 0xc57aac2 (filename not found) [in MyProject] UClass::CreateDefaultObject() Address = 0xb9d273a (filename not found) [in MyProject] UMaterialInterface::PostCDOContruct() Address = 0xc57aedb (filename not found) [in MyProject] UClass::CreateDefaultObject() Address = 0xb9d273a (filename not found) [in MyProject] ProcessNewlyLoadedUObjects() Address = 0xbbb25e2 (filename not found) [in MyProject] FEngineLoop::PreInit(wchar_t const*) Address = 0xb428610 (filename not found) [in MyProject] GuardedMain(wchar_t const*) Address = 0xb439b4d (filename not found) [in MyProject] -[UE4AppDelegate runGameThread:] Address = 0xb44348a (filename not found) [in MyProject] -[FCocoaGameThread main] Address = 0xb5e84d6 (filename not found) [in MyProject] __NSThread__start__() Address = 0x8bd66f24 (filename not found) [in Foundation] _pthread_body() Address = 0x8e45999d (filename not found) [in libsystem_pthread.dylib] _pthread_body() Address = 0x8e45991a (filename not found) [in libsystem_pthread.dylib] thread_start() Address = 0x8e457351 (filename not found) [in libsystem_pthread.dylib]
repro steps currently unknown
SEGV_MAPERR at 0x3 MyProject!UMaterialInterface::InitDefaultMaterials() MyProject!UClass::CreateDefaultObject() MyProject!UMaterialInterface::PostCDOContruct() MyProject!UClass::CreateDefaultObject() MyProject!ProcessNewlyLoadedUObjects() MyProject!FEngineLoop::PreInit() MyProject!GuardedMain() MyProject!<Unknown> MyProject!<Unknown> Foundation!Unknown() libsystem_pthread.dylib!<Unknown> libsystem_pthread.dylib!<Unknown> libsystem_pthread.dylib!<Unknown>
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-46621 in the post.