Demorec crashes editor

I’ve tried to create several different projects in 4.10 preview and each time I type “Demorec test” in the console the editor crashes.

This is the output:

MachineId:014A9D6D4A1501CF660CC9AB4C8E33ED
EpicAccountId:dd8ccdd1f3b747809d73068d7d330e50

Access violation - code c0000005 (first/second chance not available)

""

UE4Editor_Engine!TSet<TPair<TWeakObjectPtr<UObject,FWeakObjectPtr>,TSharedPtr<FRepChangedPropertyTracker,0> >,TDefaultMapKeyFuncs<TWeakObjectPtr<UObject,FWeakObjectPtr>,TSharedPtr<FRepChangedPropertyTracker,0>,0>,FDefaultSetAllocator>::FindId() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\containers\set.h:523]
UE4Editor_Engine!UNetDriver::FindOrCreateRepChangedPropertyTracker() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\engine\private\networkdriver.cpp:2815]
UE4Editor_Engine!AActor::PreReplication() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\engine\private\actor.cpp:815]
UE4Editor_Engine!UDemoNetDriver::TickDemoRecord() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\engine\private\demonetdriver.cpp:989]
UE4Editor_Engine!UDemoNetDriver::TickDispatch() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\engine\private\demonetdriver.cpp:494]
UE4Editor_Engine!TBaseUObjectMethodDelegateInstance<0,UNetDriver,void __cdecl(float)>::ExecuteIfSafe() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:772]
UE4Editor_Engine!TBaseMulticastDelegate<void,float>::Broadcast() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:809]
UE4Editor_Engine!UWorld::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\engine\private\leveltick.cpp:1062]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\unrealed\private\editorengine.cpp:1347]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\editor\unrealed\private\unrealedengine.cpp:361]
UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\launchengineloop.cpp:2427]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

Hi SaffronCR -

This is a known issue and is reported as UE-19673. I have added your new information to the report and will keep you informed here as we investigate a solution for this issue.

Thank You

Eric Ketchum

I see… Thanks!

I’m also facing a similar crash but with different message. should I open another thread since the circumstances is similar.

MachineId:8316B4634A6096B1E909BDAA255E6100
EpicAccountId:a14591dc1d3a41d0b2ae84b945d974d7

Unknown exception - code 00000001 (first/second chance not available)

"Assertion failed: ClientConnections[0]->SendBuffer.GetNumBits() == 0 [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.10\Engine\Source\Runtime\Engi

UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\core\private\misc\outputdevice.cpp:374]
UE4Editor_Engine!UDemoNetDriver::TickDemoRecord() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\engine\private\demonetdriver.cpp:957]
UE4Editor_Engine!UDemoNetDriver::TickDispatch() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\engine\private\demonetdriver.cpp:494]
UE4Editor_Engine!TBaseUObjectMethodDelegateInstance<0,UNetDriver,void cdecl(float)>::ExecuteIfSafe() [d:\buildfarm\buildmachine++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:772]
UE4Editor_Engine!TBaseMulticastDelegate::Broadcast() [d:\buildfarm\buildmachine
++depot+ue4-releases+4.10\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:809]
UE4Editor_Engine!UWorld::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\engine\private\leveltick.cpp:1062]
UE4Editor_Engine!UGameEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\engine\private\gameengine.cpp:936]
UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\launchengineloop.cpp:2427]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.10\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

Hi Frozenfire -

Just to confirm you are getting this callstack with the exact same reproduction that SaffronCR presented?

If not, let me know if you are doing anything differently to get this callstack.

Thank You

Eric Ketchum

I didn’t create new project. But on my project after running demorec for some.time it will crash. Like 10-20sec guaranteed to crash. With the same error message. Are there any clues as to what causes it

We are currently still investigating the issue, and I have added your additional information to the bug report. Currently we are still investigating the root cause of the issue and I will keep you informed here.

Eric Ketchum

Hi,

Any update on this?

Hello -

We are actively working on this issue now, but there is no fix in place for it just yet.

Thank You

Eric Ketchum

I’m getting the same error when trying to do demorec from a Play In Editor session, but it is working properly when running in Standalone. Does that workaround work for you?

I’m running on cooked / packaged game.