below is the stack trace and log of a connection to a remote game server.
from the log we can see the FSocketBSD socket fd 277 is closed by GC and it’s used to call sendto when it completed travel to a remote level.
[2024.05.02-17.17.40:173][301]LogSockets: ~FSocketBSD Socket fd: 277
[2024.05.02-17.17.40:182][301]LogStats: FPlatformStackWalk::StackWalkAndDump - 0.009 s
[2024.05.02-17.17.40:182][301]LogOutputDevice: === FDebug::DumpStackTrace(): ===
[2024.05.02-17.17.40:182][301]LogOutputDevice:
[2024.05.02-17.17.40:182][301]LogOutputDevice: [Callstack] 0x017adb0c UnrealEditor-Sockets.dylib!FSocketMac::~FSocketMac() [UnknownFile])
[2024.05.02-17.17.40:182][301]LogOutputDevice: [Callstack] 0x017ad92c UnrealEditor-Sockets.dylib!FSocketMac::~FSocketMac() [UnknownFile])
[2024.05.02-17.17.40:182][301]LogOutputDevice: [Callstack] 0x13e9fa64 UnrealEditor-OnlineSubsystemUtils.dylib!UIpConnection::CleanUp() [UnknownFile])
[2024.05.02-17.17.40:182][301]LogOutputDevice: [Callstack] 0x17c2c9e4 UnrealEditor-Engine.dylib!UNetDriver::FinishDestroy() [UnknownFile])
[2024.05.02-17.17.40:182][301]LogOutputDevice: [Callstack] 0x0323a154 UnrealEditor-CoreUObject.dylib!UObject::ConditionalFinishDestroy() [UnknownFile])
[2024.05.02-17.17.40:182][301]LogOutputDevice: [Callstack] 0x030ce978 UnrealEditor-CoreUObject.dylib!IncrementalPurgeGarbage(bool, double) [UnknownFile])
[2024.05.02-17.17.40:182][301]LogOutputDevice: [Callstack] 0x030d6514 UnrealEditor-CoreUObject.dylib!void UE::GC::PostCollectGarbageImpl<true>(EObjectFlags) [UnknownFile])
[2024.05.02-17.17.40:182][301]LogOutputDevice: [Callstack] 0x030d33d4 UnrealEditor-CoreUObject.dylib!UE::GC::FReachabilityAnalysisState::PerformReachabilityAnalysisAndConditionallyPurgeGarbage(bool) [UnknownFile])
[2024.05.02-17.17.40:182][301]LogOutputDevice: [Callstack] 0x030d776c UnrealEditor-CoreUObject.dylib!CollectGarbage(EObjectFlags, bool) [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x1895fc9c UnrealEditor-Engine.dylib!UEngine::TrimMemory() [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x1895b5fc UnrealEditor-Engine.dylib!UEngine::LoadMap(FWorldContext&, FURL, UPendingNetGame*, FString&) [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x18959008 UnrealEditor-Engine.dylib!UEngine::TickWorldTravel(FWorldContext&, float) [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x105feb68 UnrealEditor-UnrealEd.dylib!UEditorEngine::Tick(float, bool) [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x113216fc UnrealEditor-UnrealEd.dylib!UUnrealEdEngine::Tick(float, bool) [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x00cd2100 UnrealEditor!FEngineLoop::Tick() [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x00cdcbd4 UnrealEditor!GuardedMain(char16_t const*) [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x00cf5548 UnrealEditor!-[UEAppDelegate runGameThread:] [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x04c1ec24 UnrealEditor-Core.dylib!-[FCocoaGameThread main] [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x9b028520 Foundation!__NSThread__start__() [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x99e1ef94 libsystem_pthread.dylib!_pthread_start() [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice: [Callstack] 0x99e19d34 libsystem_pthread.dylib!thread_start() [UnknownFile])
[2024.05.02-17.17.40:183][301]LogOutputDevice:
[2024.05.02-17.17.40:184][301]LogSockets: close FSocketBSD Socket fd: 277
[2024.05.02-17.17.40:184][301]LogSockets: close FSocketBSD Socket fd: -1, error: -1
[2024.05.02-17.17.40:235][301]LogUObjectHash: Compacting FUObjectHashTables data took 0.85ms
[2024.05.02-17.17.40:320][301]LogAudio: Display: Audio Device (ID: 2) registered with world 'FirstPersonMap'.
[2024.05.02-17.17.40:320][301]LogWorldMetrics: [Initialize]
[2024.05.02-17.17.40:321][301]LogRenderer: SceneCulling instance hierarchy is disabled as UseNanite(METAL_SM5) returned false, for scene: 'World /Game/FirstPerson/Maps/UEDPIE_1_FirstPersonMap.FirstPersonMap'.
[2024.05.02-17.17.40:321][301]LogWorldPartition: ULevel::OnLevelLoaded(FirstPersonMap)(bIsOwningWorldGameWorld=1, bIsOwningWorldPartitioned=1, InitializeForMainWorld=1, InitializeForEditor=0, InitializeForGame=1)
[2024.05.02-17.17.40:321][301]LogWorldPartition: Display: WorldPartition initialize started...
[2024.05.02-17.17.40:321][301]LogWorldPartition: UWorldPartition::Initialize : World = /Game/FirstPerson/Maps/UEDPIE_1_FirstPersonMap.FirstPersonMap, World Type = PIE, IsMainWorldPartition = 1, Location = V(0), Rotation = R(0), IsEditor = 0, IsGame = 0, IsPIEWorldTravel = 1, IsCooking = 0
[2024.05.02-17.17.40:321][301]LogWorldPartition: UWorldPartition::Initialize Context : World NetMode = Client, IsServer = 0, IsDedicatedServer = 0, IsServerStreamingEnabled = 0, IsServerStreamingOutEnabled = 0, IsUsingMakingVisibleTransaction = 0, IsUsingMakingInvisibleTransaction = 0
[2024.05.02-17.17.40:322][301]LogWorldPartition: Display: GenerateStreaming for 'FirstPersonMap' started...
[2024.05.02-17.17.40:324][301]LogWorldPartition: FSpatialHashSettings::UpdateSettings : UseAlignedGridLevels = 1, SnapNonAlignedGridLevelsToLowerLevels = 1, PlaceSmallActorsUsingLocation = 0, PlacePartitionActorsUsingLocation = 1
[2024.05.02-17.17.40:325][301]LogStreaming: Display: FlushAsyncLoading(60): 58 QueuedPackages, 0 AsyncPackages
[2024.05.02-17.17.40:340][301]LogWorldPartition: Display: GenerateStreaming for 'FirstPersonMap' took 18.159 ms
[2024.05.02-17.17.40:341][301]LogContentBundle: [FirstPersonMap(Client 1)] Creating new container.
[2024.05.02-17.17.40:341][301]LogWorldPartition: Display: WorldPartition initialize took 20.262 ms (total: 61.937 ms)
[2024.05.02-17.17.40:341][301]LogPlayLevel: PIE: World Init took: (0.020982s)
[2024.05.02-17.17.40:343][301]LogWorld: Bringing World /Game/FirstPerson/Maps/UEDPIE_1_FirstPersonMap.FirstPersonMap up for play (max tick rate 0) at 2024.05.03-01.17.40
[2024.05.02-17.17.40:343][301]LogWorld: Bringing up level for play took: 0.002029
[2024.05.02-17.17.40:343][301]LogLoad: Took 0.204011 seconds to LoadMap(/Game/FirstPerson/Maps/FirstPersonMap)
[2024.05.02-17.17.40:343][301]LogGlobalStatus: LoadMap Load map complete /Game/FirstPerson/Maps/FirstPersonMap
[2024.05.02-17.17.40:343][301]LogSockets: send to Socket fd: 277
[2024.05.02-17.17.40:343][301]LogNet: handle socket send result in LowLevelSend with subsystem.
[2024.05.02-17.17.40:352][301]LogStats: FPlatformStackWalk::StackWalkAndDump - 0.008 s
[2024.05.02-17.17.40:352][301]LogOutputDevice: === FDebug::DumpStackTrace(): ===
[2024.05.02-17.17.40:352][301]LogOutputDevice:
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x13ea18d8 UnrealEditor-OnlineSubsystemUtils.dylib!UIpConnection::LowLevelSend(void*, int, FOutPacketTraits&) [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x17bec1ec UnrealEditor-Engine.dylib!UNetConnection::FlushNet(bool) [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x17edaa28 UnrealEditor-Engine.dylib!UPendingNetGame::SendJoin() [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x17ed86a4 UnrealEditor-Engine.dylib!UPendingNetGame::TravelCompleted(UEngine*, FWorldContext&) [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x18959294 UnrealEditor-Engine.dylib!UEngine::TickWorldTravel(FWorldContext&, float) [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x105feb68 UnrealEditor-UnrealEd.dylib!UEditorEngine::Tick(float, bool) [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x113216fc UnrealEditor-UnrealEd.dylib!UUnrealEdEngine::Tick(float, bool) [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x00cd2100 UnrealEditor!FEngineLoop::Tick() [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x00cdcbd4 UnrealEditor!GuardedMain(char16_t const*) [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x00cf5548 UnrealEditor!-[UEAppDelegate runGameThread:] [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x04c1ec24 UnrealEditor-Core.dylib!-[FCocoaGameThread main] [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x9b028520 Foundation!__NSThread__start__() [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x99e1ef94 libsystem_pthread.dylib!_pthread_start() [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice: [Callstack] 0x99e19d34 libsystem_pthread.dylib!thread_start() [UnknownFile])
[2024.05.02-17.17.40:352][301]LogOutputDevice:
[2024.05.02-17.17.40:357][301]LogNet: UIpConnection::HandleSocketSendResult: Socket->SendTo failed with error 10 (SE_ENOTSOCK). [UNetConnection] RemoteAddr: 52.78.188.170:7777, Name: IpConnection_2, Driver: Name:GameNetDriver Def:GameNetDriver IpNetDriver_2, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: NULL:Siqis-MacBook-Pro.local-36F1B2593B424ED8F914098881EAE46A Connection beginning close timeout (Timeout = 5.000000).
any help and thoughts will be appreciated.
Thanks in advance