Unreal Engine Issues and Bug Tracker (UE-47257)

Description

This is a common crash affecting users in 4.15 and 4.16.

User Descriptions

I connected two reroute nodes together in a circle. And well it brought me here.
I connected a reroute node with a reroutnode which it got information from. So basically a reoroutenode loop.
In a Blueprint:
I reconnected an execution (to-)Pin, using Ctrl+Drag, to a reroute-point of the same execution line that this pin was connected from. Because the reroute-point was earlier in the execution line, this ended up in an infinite loop which caused a Stack overflow.

Source Context

 117       void UK2Node_Knot::PropagatePinTypeFromInput()
  118       {
  119       	// Set the type of the pin based on input connections.
  120       	// We have to move up the chain of linked reroute nodes until we reach a node
  121       	// with type information before percolating that information down.
  122 ***** 	UEdGraphPin* MyInputPin = GetInputPin();
  123       	UEdGraphPin* MyOutputPin = GetOutputPin();
  124       
  125       	for (UEdGraphPin* InPin : MyInputPin->LinkedTo)
  126       	{
  127       		if (UK2Node_Knot* KnotNode = Cast<UK2Node_Knot>(InPin->GetOwningNode()))
  128       		{
  129       			KnotNode->PropagatePinTypeFromInput();
  130       		}
  131       	}

Steps to Reproduce

Place a Make Array node
Connect to a Length node
Double click the connection between them to create 3 reroute nodes
Select the last 2 reroute nodes and collapse to macro
Connect the output pin of the macro to the remaining reroute node
Expand the macro

Callstack

Stack overflow - code c00000fd (first/second chance not available)

UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:123]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]
UE4Editor_BlueprintGraph!UK2Node_Knot::PropagatePinTypeFromInput() [k2node_knot.cpp:127]

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Fixed

Component	UE - Gameplay - Blueprint
Affects Versions	4.15, 4.16, 4.17
Target Fix	4.17

Fix Commit	3538577
Main Commit	3555226
Release Commit	3538577

Created	Jul 14, 2017
Resolved	Jul 14, 2017
Updated	Apr 27, 2018

UE-47257

[CrashReport] Crash related to looped Reroute nodes

[CrashReport] Crash related to looped Reroute nodes

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