Memory Leak in 4.8 from migrated maps when play in editor

Development Platform & Builds
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1

I just migrated my project from 4.7.6 to 4.8 and when I tried to play in editor it leaks memory to above 10gb (around amount available) and eventually crashes.

I eventually worked out where issue was coming from, save game system. If I deleted load game from my blueprint it would work fine. I then tried deleting SAV file from hard drive but keeping load game in blueprint and it worked.

Now when a new SAV file is created and then reloaded it doesn’t have an issue.

This is obviously a bug with existing SAV files not being compatible with new 4.8 and an easy fix with just deleting it and letting a new one get created.
Not sure if there is much Epic could do about this but it might help out someone else that has same issue.

Cheers, Scott

2

Hi Scott,

Can you tell me if there is any log spam in your output log? This could cause issues when somebody updates a released game in future, so I want to figure this out. I’m consulting with one of our other support members who’s more familiar with save system.

-.

3

Hi ,

I opened session frontend and when i hit play in editor it didn’t report any output at all.
Please find attached two versions of save game file for both 4.7.6 and 4.8.
I have also included only log output, which is crash report.
I also sent crash report only moments before posting this.

Let me know if you need anything more.

Scott

4

Hi Scott,

How did you migrate your project? I attempted to reproduce this by creating a copy of a project with a sav file, but sav file wasn’t copied over.

5

Hi ,

I created a backup manually in explorer and then migrated original project, which is probably why save file didn’t move.

6

Okay, so I tested by creating a copy of project in Explorer and then used Switch Engine Versions to open it in 4.8. Playing in Editor with old saved file appears to freeze editor (and I will be entering a bug report for that), but I don’t see any memory leak occurring and I don’t get any crash report.

Can you upload 4.7.6 version of your project somewhere like Dropbox or Google Drive and send me a download link? Or if you can reproduce this in a new project, that would be even better. Thanks!

7

I’m uploading project to my dropbox atm and I will send you a PM on forums with link.
One other thing is that lighting goes funky when converting to 4.8. It looks like everything has a neon sign on it. To fix it I had to delete directional light and replace it. You might notice it also when you convert this project to 4.8.

Cheers Scott

8

Hi Tocs,

Thanks for project! It looks like we’re seeing same thing, though mine freezes before getting to an actual crash. same thing happened in project you sent me. I’ve created a bug report for issue UE-17600), and I’ll post here when I see a fix come through. In meantime, just be aware that .sav files from 4.7.6 will not work in 4.8. Thanks again!