Unreal Engine Issues and Bug Tracker (UE-51531)

Description

Typically users are unable to select a structs that reference each other but I was able to find a way around this by manipulating the Do Not Save functionality when closing the editor.

Not a regression as this is occurring in 4.18 as well. Can regress further but I'm pretty sure this is an extreme edge case.

Steps to Reproduce

Open any project in the editor
Create a struct named CircRef_A
Create a struct named CircRef_B
Open CircRef_A and set the first member variable type to CircRef_B
Save CircRef_A
Change the variable type from CircRef_B to anything else but Do Not save
Open CircRef_B and change the variable type to CircRef_A and save CircRef_B
Close the editor and Do Not Save CircRef_A
Reopen the project
Attempt to open either of the structures

Result: Crash

Callstack

UE4Editor_CoreUObject!IsInAsyncLoadingThreadCoreUObjectInternal() asyncloading.cpp:6723 
UE4Editor_CoreUObject!GetObjectsWithOuter() uobjecthash.cpp:635 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:260 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25 
UE4Editor_CoreUObject!UStructProperty::LinkInternal() propertystruct.cpp:76 
UE4Editor_CoreUObject!UStruct::Link() class.cpp:613 
UE4Editor_CoreUObject!UScriptStruct::Link() class.cpp:2211 
UE4Editor_CoreUObject!UStruct::StaticLink() class.cpp:544 
UE4Editor_Engine!UUserDefinedStruct::RecursivelyPreload() userdefinedstruct.cpp:269 
UE4Editor_CoreUObject!PreloadInnerStructMembers() propertystruct.cpp:25

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Won't Fix

Component	UE - Gameplay - Blueprint
Affects Versions	4.18, 4.19

Created	Oct 23, 2017
Resolved	Aug 18, 2021
Updated	Aug 18, 2021

UE-51531

Crash opening a structure with a circular reference

Crash opening a structure with a circular reference

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