Not sure How to get the callStack,
but I do know that yes I am using UInstancedStaticMeshComponent.
Assertion failed: !GEventDrivenLoaderEnabled || !bLockoutLegacyOperations || !EVENT_DRIVEN_ASYNC_LOAD_ACTIVE_AT_RUNTIME
[File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp] [Line: 3126]