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Licensee is using the chunk downloader. On Shutdown method of their GameInstance, they call FChunkDownloader->Finalize. When they quit the game (Alt+F4) during a chunck download an assertion is hit in FPakPrecacher::Unmount : "Pak cannot be unmounted with outstanding requests". //UE4/Release-4.27/Engine/Source/Runtime/PakFile/Private/IPlatformFilePak.cpp#1 line 2982.
There is no negative consequence of case being reached during shutdown other than the check statement. If the case is reached earlier (e.g. they try to unmount it because the user canceled the request), there will be a small memory leak - the PakPrecacher will keep the Pak in its list of monitored paks forever.
For now the licensee could just change the check to a UE_LOG(LogPakFile, Error).
For a proper fix, we should change the PakPrecacher to remove the Pak file later once the last outstanding result is fulfilled.
In a runtime game, mount an optional pak file.
Send 10000 read requests from the pak file, enough to keep it busy for a while.
Unmount the pak file.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-147659 in the post.
| 0 |
| Component | UE - Foundation |
|---|---|
| Affects Versions | 4.27 |
| Target Fix | 4.27 |
| Created | Mar 31, 2022 |
|---|---|
| Updated | Jul 31, 2024 |