Unreal Engine Issues

FMultiReaderSingleWriterGT isn't thread safe

From https://udn.unrealengine.com/questions/292741/fmultireadersinglewritergt-isnt-thread-safe.html: I've found that FMultiReaderSingleWriterGT has at least 2 bugs: The one that caused a deadlock ...

[CrashReport] UE4Editor_UnrealEd!FEdGraphUtilities::PostProcessPastedNodes() [edgraphutilities.cpp:138]

This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below. Error message: Access violation - code c0000005 ( ...

PATH not passed to NMake script when building Android from Visual Studio

After upgrading from UE5.0.3 to UE5.1, we started seeing this error when trying to build Android Development from Visual Studio (VS2022 17.2.1): Running UnrealBuildTool: dotnet "..\..\Engine\Binari ...

StateTree: While editing State Parameters or exposed properties of a Condition/Task, an ensure() fires when editing inputs of a Property Function bound to an array element

Consider an array property that can be edited in the StateTree editor. This can be a State Parameter or an exposed property of a Condition or Task, for example. Each element of the array can be boun ...

[CrashReport] Linux crash - FScopeContext::FScopeContext()

This is a somewhat common Linux crash occurring in 4.17.2. (there are a few older records in 4.16.2 and 4.17.1 also, but most occur in 4.17.2) Callstack from Log[2017.10.04-14.49.42:768][ 2]LogFi ...

Fixing up GoogleVRHMD static analysis warning

[Line 1585] d:​\build​++ue4+release-4.14+compile​\sync​\engine​\plugins​\runtime​\googlevr​\googlevrhmd​\source​\googlevrhmd​\private​\googlevrhmdrender.cpp(42) : warning C6386: Buffer overrun while ...

Fix InstancedStaticMesh RemoveInstance invalidating indices

When removing instances from an ISMC, indices / indexes returned from AddInstance will be invalidated. This can cause issues for users that want to do custom management of instances. Using something ...

Investigate/Fix incremental component unregister

Streaming a level back in before it finishes streaming out behaves undesirably. When a level is streamed out the actors/components in the level are incrementally unregistered over multiple frames. ...

Fix TSR velocity extrusion on rotating

MPCook: Fix replication of UObject::CookAdditionalFilesOverride

MPCook relies on global data that is accumulated during package cooks on CookWorkers be replicated to the CookDirector. Some global data that is accumulated during package cooks is CookAdditionalFi ...