Handled error: Ensure condition failed: CurrentDepthTexture

ZoltanE · June 19, 2015, 4:44pm

In binary 4.8 at a certain part of game loop I started getting following errors:

Ensure condition failed: CurrentDepthTexture [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Commands.cpp] [Line: 650]

Stack: 
UE4Editor-Core.dll!FWindowsPlatformStackWalk::StackWalkAndDump() {0x000007fede8fa846} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FDebug::EnsureFailed() {0x000007fede794071} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FDebug::EnsureNotFalse_OptionallyLogFormattedEnsureMessageReturningFalse() {0x000007fede794323} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-D3D11RHI.dll!FD3D11DynamicRHI::ValidateExclusiveDepthStencilAccess() {0x000007fed498c379} + 53 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-D3D11RHI.dll!FD3D11DynamicRHI::RHISetDepthStencilState() {0x000007fed497fc94} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Renderer.dll!FTranslucencyDrawingPolicyFactory::DrawMesh() {0x000007fedc6ff9ce} + 42 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Renderer.dll!FTranslucencyDrawingPolicyFactory::DrawDynamicMesh() {0x000007fedc6feb95} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Renderer.dll!FRendererModule::DrawTileMesh() {0x000007fedc5d6040} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!FTileRenderer::DrawTile() {0x000007fed8120a4b} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!`FCanvasTileRendererItem::Render_GameThread'::`5'::EURCMacro_DrawTileCommand::DoTask() {0x000007fed811899d} + 413 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!TGraphTask<`FCanvasTileRendererItem::Render_GameThread'::`5'::EURCMacro_DrawTileCommand>::ExecuteTask() {0x000007fed8128dd1} + 18 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FTaskThread::ProcessTasks() {0x000007fede6363be} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FTaskThread::ProcessTasksUntilQuit() {0x000007fede6365ed} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-RenderCore.dll!RenderingThreadMain() {0x000007fee8065d3b} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-RenderCore.dll!FRenderingThread::Run() {0x000007fee806624f} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FRunnableThreadWin::Run() {0x000007fede8f65f8} + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FRunnableThreadWin::GuardedRun() {0x000007fede8e14ad} + 8 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
kernel32.dll {0x00000000772059cd} + 0 bytes
ntdll.dll {0x000000007743b981} + 0 bytes
ntdll.dll {0x000000007743b981} + 0 bytes

So many of them that sudden log dump freezes both PIE window and editor for a good minute. Then game resumes like nothing happened. I tried to find exact location of problem by setting blueprint breakpoints but I wasn’t able to pinpoint a specific node: with breakpoints freezing does not happen (a variable amount of log prints do) and I couldn’t find a node which executes instantly after freeze. Sometimes I get only a single instance of error message above when I stop simulation.

This is what is happening up to freeze: I take away input from pawn and disable collisions on it. Then a timeline adjusts a few material parameters so a post process material covers up screen. timeline also has a few events which control when I teleport pawn to a new location. timeline finishes with removing cover effect from screen, pawn gets input and collision. And around this time freeze occurs.

I’m not sure where to keep digging, there are a quite a few things happening in game at that point.

Minidump

ZoltanE · June 21, 2015, 1:11pm

I disabled my “blendable” post process material, SSAO, DOF, MotionBlur and Temporal AA but none of that helped.

I get 90-150 messages in one dump, ~16 ms apart. I’m not sure why message count varies this much, issues shows up after a 4 second long automated sequence with no human control. As far as I can tell that’s all finished and error occurs just as game logic starts idling (actors ticking, waiting for human interaction).

ZoltanE · June 22, 2015, 10:06am

error occurs in a 32bit packaged game too: incident occurs at same place in game loop but freeze is much shorter, less than a second and error count is more than a 1000.

Lovecraft_K · June 22, 2015, 2:02pm

Hi -

Do you happen to have a project which you can share that replicates this endure? I am trying to replicate issue internally but number of variables to test is fairly high in this instance and it would speed things along to be able to eliminate variables from a project that already is causing this issue.

If you would like to keep project private please feel free to message me via forums with a link to download project.

Thank You

Eric Ketchum

ZoltanE · June 22, 2015, 5:09pm

I tracked issue to a single node. Here is chain of events:

A “Mission” is started.
mission spawns a weapon.
new weapon actor is initialized by calling one of its functions.
That function registers this weapon in game state through an interface custom game state class implements.
implementation takes weapon instance as parameter and sets a variable to that value.

If I unlink that last step in game state class, Set node, no error appears.
I’m packing up project and send you details in PM.

anonymous_user_33800a51 · June 25, 2015, 8:19pm

Hi ,

I’m not sure cause of ensure, but I can verify that we see this in project you provided. I’ve created a bug report for issue (UE-17723) and I’ll keep you updated on its progress. Thanks for report!

ZoltanE · June 26, 2015, 6:20am

Would it be possible to explain to me what that error message means? At least on a high level, maybe I can find more clues as keep working, refactoring. I know how digging through someone else’s project is not most fun job, so I’d like to help any way I can.

anonymous_user_33800a51 · June 26, 2015, 4:15pm

I’ll send an email out, see if I can find an answer for you before bug report is looked into. No promises, but I will try to find out what that error message is coming from.

anonymous_user_33800a51 · June 26, 2015, 4:22pm

Actually, I just remembered that we found another report with same ensure spam, and it appears in that case to involve using a Translucent Material with Responsive AA enabled inside a HUD class with Draw Material Simple.

ZoltanE · June 26, 2015, 4:28pm

Yes! weapon added it’s own crosshair which indeed had responsive AA turned on. Now it’s off, no more errors. Thank you!