The project crashes after updating the project from 5.4 to 5.5. Fatal error: Loading is stuck, flush will never finish
Please select what you are reporting on:
Creative
What Type of Bug are you experiencing?
Assets
Steps to Reproduce
Update the project from version 5.4 to 5.5
Expected Result
Normal project loading
Observed Result
The project is crashing. The error code:
[File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading2.cpp] [Line: 9985]
Loading is stuck, flush will never finish
Same roughly. But the conditions are different.
I case is already occurring as of UE 5.4[Source build ver, engine code unchanged]. and In my win11 environment, this issue has been occurring continue 5.4.x to 5.5.1, and my game build target is a “packaged standalone for WindowsClient” build. However, the UE_LOG output “Loading is stuck, flush will never finish” was not define in the “AsyncLoading2.cpp” source code in 5.4, so the symptom occurred in the form of the launched built game not non error notify, endless never blackscreen. Also, in 5.4 the editor launches correctly and when I launch the game in “PIE Standalone” this issue does not occur.
The topic poster also reported “updating the project from version 5.4 to 5.5”, but this issue also occurs when creating a new blank preset project and non change project data packaging it, so it seems to be a game engine version specific issue and not caused by the project update. At least in my case, I was continue developing games before 5.3 and have not had this problem with the 5.3 version.
I’ve been checking at this issue for the past few months, but why is no one discussing it? I wonder if this is just a not very well known issue that occurs under certain development environments. This issue continuing in the release branch is a fatal. I hope this will be resolved as quickly as possible.
P.S. I am attaching the global=veryverbose logs of building an blank preset UE 5.5 project and experiencing the issue as a standalone build. Attached log file
Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading2.cpp] [Line: 9991]
Loading is stuck, flush will never finish
Hi I’m having the same issue, does anyone have any tips?
I’ve tried:
-Deleting DDC & Intermediate
-Deleting Saved
-Deleting all plugins
-Opened Blank 5.5 Project
-Restarted
-Deleting the plugins section from my uProject
-Trying on 2 different PCs.
Hey for anyone who sees this in the future, here’s how we resolved this.
Download Optional C++ for the engine version
Attach Visual Studio to Unreal as it loads
Breakpoint the crash and work back through the callstack until you find the trouble child, for us, it was the K2 Node - GET Sequence Binding.
We deleted the references to this node in our 5.4.4 project
Opened the project in 5.5.1
Then re-added these nodes back in and it worked just fine.
I checked the call stack again, and in my case, the cause seems to be “WorldGridMaterial” in the dumping state of the attached error log, so whether the same procedure can solve the problem may depend on each individual situation. By the way, there seems to be a problem with WorldGridMaterial since 5.4.x, which may be indirectly related to this problem.
You are talking about the “bUseIoStore”, right? That is already enabled in the default settings of the 5.5 blank project, but just to be sure I checked that it was enabled correctly in DefaultGame.ini and then package it, but that didn’t solve the problem.