4.18.1 Editor crash on migrated project

Development Programming & Scripting
1

I do have a C++ project that I started back on 4.14 and migrated it through the versions without any major issues(Needed some Target*.cs changes and such but nothing that could not be dealt with).

Now I cannot migrate the project to 4.18.1.

[2017.11.22-10.12.17:156][783]LogLinux: Error: appError called: Assertion failed: !F->GetSuperFunction() || (F->GetSuperFunction()->FunctionFlags&FUNC_NetFuncFlags) == (F->FunctionFlags&FUNC_NetFuncFlags) [File:/run/media/stastny/ext_ssd/UnrealEngine/Engine/Source/Runtime/CoreUObject/Private/UObject/Class.cpp] [Line: 3068] 
   
Signal 11 caught.
Malloc Size=131076 LargeMemoryPoolOffset=131092

I have tried reproducing the issue but sadly I could not find a way to reliably do so.

I can open the project when I set the default editor map but when I try to open ANY blueprint class type item from the project(Includes Blueprint Actors, Blueprint Interfaces, Function Libraries, HUD, User Widget, UMG drag and drop operation, GameMode, PlayerState) the editor crashes with the same error. (from the logs https://gist.github.com/aknarts/bd0d12abbc63ff3836ca6aba75b58f28 )

Please note that this includes things from the starter content that I made no changes in.

As I am not able to reproduce this all I can do is offer my project to test things out. I am not proud of it but there is nothing secret in it or nothing that cannot be redistributed.

This Is an extension of this error report

Edit:

Doing bit of debugging on this.
In case it was not super obvious it is crashing here: https://github.com/EpicGames/UnrealEngine/blob/release/Engine/Source/Runtime/CoreUObject/Private/UObject/Class.cpp#L3068

I disabled the check(crazy I know) and the project loaded OK, was playable networked stuff worked OK too.

Got bunch of errors with this:

1001[2017.11.23-23.37.09:309][263]LogLinker: Warning: Can't find file '/Script/EnvironmentQueryEditor'
1001[2017.11.23-23.37.09:309][263]LogLinker: Warning: Can't find file for asset '/Script/EnvironmentQueryEditor' while loading ../../../../../../../../home/user/Documents/Unreal Projects/Project 4.18/Content/Code/Maps/DefaultMap.umap.
[2017.11.23-23.37.09:309][263]LoadErrors: Error: /Game/Code/Maps/DefaultMap : Can't find file for asset. /Script/EnvironmentQueryEditor
1001[2017.11.23-23.37.09:310][263]LogLinker: Warning: Can't find file '/Script/EnvironmentQueryEditor'
1001[2017.11.23-23.37.09:310][263]LogLinker: Warning: Can't find file for asset '/Script/EnvironmentQueryEditor' while loading ../../../../../../../../home/user/Documents/Unreal Projects/Project 4.18/Content/Code/Maps/DefaultMap.umap.
1001[2017.11.23-23.37.09:310][263]LogLinker: Warning: Can't find file '/Script/EnvironmentQueryEditor'
1001[2017.11.23-23.37.09:310][263]LogLinker: Warning: Can't find file for asset '/Script/EnvironmentQueryEditor' while loading ../../../../../../../../home/user/Documents/Unreal Projects/Project 4.18/Content/Code/Maps/DefaultMap.umap.
1001[2017.11.23-23.37.09:310][263]LogLinker: Warning: Can't find file '/Script/EnvironmentQueryEditor'
1001[2017.11.23-23.37.09:310][263]LogLinker: Warning: Can't find file for asset '/Script/EnvironmentQueryEditor' while loading ../../../../../../../../home/user/Documents/Unreal Projects/Project 4.18/Content/Code/Maps/DefaultMap.umap.
1001[2017.11.23-23.37.09:540][263]LogLinker: Warning: Can't find file '/Script/EnvironmentQueryEditor'
1001[2017.11.23-23.37.09:540][263]LogLinker: Warning: Can't find file for asset '/Script/EnvironmentQueryEditor' while loading ../../../../../../../../home/user/Documents/Unreal Projects/Project 4.18/Content/Code/Maps/DefaultMap.umap.
1001[2017.11.23-23.37.09:545][263]LogLinker: Warning: Can't find file '/Script/EnvironmentQueryEditor'
1001[2017.11.23-23.37.09:545][263]LogLinker: Warning: Can't find file for asset '/Script/EnvironmentQueryEditor' while loading NULL.
1001[2017.11.23-23.37.09:545][263]LogLinker: Warning: Can't find file '/Script/EnvironmentQueryEditor'
1001[2017.11.23-23.37.09:545][263]LogLinker: Warning: Can't find file for asset '/Script/EnvironmentQueryEditor' while loading NULL.
1001[2017.11.23-23.37.09:545][263]LogLinker: Warning: Can't find file '/Script/EnvironmentQueryEditor'

I did use EQS at some point so it was enabled in the original project. Not sure why it was not enabled After the migration to 4.18.

2

Curious thing, when I migrate the code manually it sometimes does work(basically if it does not need to take along any dependency it works OK. I would say that the migration is somehow broken.

3

Hello Aknarts,

I have a couple of questions about your issue to help narrow down the issue you are experiencing.

  1. What platform is this issue occurring to you on? is it happening on multiple platforms?
  2. Is your project using any version of source control?
  3. Can you provide the full callstack for the crash you are experiencing?

Thanks!

4

Hi, it is the same exact issue as https://answers.unrealengine.com/questions/718928/4180-editor-crash-while-opening-child-blueprint.html , there is a way how to reproduce it now. It is multiple platforms, I just find it easier to test it on Linux as I have to build the editor there anyway, but on the same project it happens on Windows too. Using Git for source control. And I think I provided the full callstack in the other bug report.

5

Hello again,

It appears that fix has been submitted and should be in the 4.18.2 binary release. If you are compiling the engine yourself, here is the github pr.

Thanks!

6

I’m getting crashes on startup (at 93%) from a 4.18.0 source build project being migrated to 4.18.1 source build. Could this be the same issue?

7

Let’s go for Launcher 4.18.2 hotfix !!! Make it a great weekend again!

8

I can confirm that the issue is fixed on the current 4.18 branch (4.18.2)