Unreal Engine multi process cook crashes

Question

Hey, I'm attempting to enable Multi Process Cook. I consistently get crashes when attempting that kind of cook with Wwise assets. Single process always works. I have read the known issues here (https://www.audiokinetic.com/en/public-library/2024.1.4_8780/?source=UE4&id=using_knownissues.html), I have tested both versions 2024.1.3 and 2024.1.4. I have used the WwisePackagingSettings bPackageAsBulkData set to true. The below crash happens regardless. I can translate the non-english part, it says that the file cannot be accessed by the process, because it is used by another process. I'm using UE 5.5.

Has anyone got it to work? I was wondering why are the *.wem files created with the option turned on, since the option comment says it should be using uasset files.

[CookWorker 1]: Runnable thread Background Worker #1 crashed.
[CookWorker 1]: begin: stack for UAT
[CookWorker 1]: === Critical error: ===
[CookWorker 1]: Fatal error: [File:Engine\Source\Editor\UnrealEd\Private\Cooker\LooseCookedPackageWriter.cpp] [Line: 451]
[CookWorker 1]: SavePackage Async write Saved/Cooked/Windows/Content/579868A34425CECF8F0574B90A134D37_en.wem failed: Proces nie może uzyskać dostępu do pliku, ponieważ jest on używany przez inny proces.

[Callstack] 0x00007ffdc68d34bb UnrealEditor-UnrealEd.dll!WriteToFile()
[Callstack] 0x00007ffdc688103d UnrealEditor-UnrealEd.dll!FLooseCookedPackageWriter::FWriteFileData::HashAndWrite()
[Callstack] 0x00007ffdc6823170 UnrealEditor-UnrealEd.dll!`FLooseCookedPackageWriter::AsyncSaveOutputFiles'::`2'::<lambda_1>::operator()()
[Callstack] 0x00007ffdc6866255 UnrealEditor-UnrealEd.dll!UE::Tasks::Private::TExecutableTaskBase<`FLooseCookedPackageWriter::AsyncSaveOutputFiles'::`2'::<lambda_1>,void,void>::ExecuteTask()
[Callstack] 0x00007ffdc6425b40 UnrealEditor-UnrealEd.dll!UE::Tasks::Private::FTaskBase::TryExecuteTask()
[Callstack] 0x00007ffdc63dc2e4 UnrealEditor-UnrealEd.dll!LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __cdecl(bool),48>::TTaskDelegateImpl<`LowLevelTasks::FTask::Init<`UE::Tasks::Private::FTaskBase::Init'::`2'::<lambda_1> >'::`13'::<lambda_1>,0>::CallAndMove()
[Callstack] 0x00007ffdcf380115 UnrealEditor-Core.dll!LowLevelTasks::FTask::ExecuteTask()
[Callstack] 0x00007ffdcf37ffde UnrealEditor-Core.dll!LowLevelTasks::FScheduler::ExecuteTask()
[Callstack] 0x00007ffdcf3a6aad UnrealEditor-Core.dll!LowLevelTasks::FScheduler::WorkerLoop()
[Callstack] 0x00007ffdcf36d0c6 UnrealEditor-Core.dll!`LowLevelTasks::FScheduler::CreateWorker'::`2'::<lambda_1>::operator()()
[Callstack] 0x00007ffdcf577f03 UnrealEditor-Core.dll!FThreadImpl::Run()
[Callstack] 0x00007ffdcf9ca78d UnrealEditor-Core.dll!FRunnableThreadWin::Run()
[Callstack] 0x00007ffdcf9c1baf UnrealEditor-Core.dll!FRunnableThreadWin::GuardedRun()
[Callstack] 0x00007ffec738e8d7 KERNEL32.DLL!UnknownFunction []

[CookWorker 1]: Crash in runnable thread Background Worker #1
[CookWorker 1]: end: stack for UAT

Comments

I can add more info, there are 2 ways this is caused. The below are relevant parts of the log in chronological order. One is:

LogWwiseFileHandler: Display: Wwise: Adding file 164054554A4456D7B62DD3B885FC3F0A_en.wem [36332 bytes] from 164054554A4456D7B62DD3B885FC3F0A_en.wem
LogWwiseFileHandler: Display: [CookWorker 0]: Wwise: Adding file 164054554A4456D7B62DD3B885FC3F0A_en.wem [36332 bytes] from 164054554A4456D7B62DD3B885FC3F0A_en.wem
LogWwiseFileHandler: Display: [CookWorker 1]: Wwise: Adding file 164054554A4456D7B62DD3B885FC3F0A_en.wem [36332 bytes] from 164054554A4456D7B62DD3B885FC3F0A_en.wem
LogWwiseFileHandler: Display: [CookWorker 2]: Wwise: Adding file 164054554A4456D7B62DD3B885FC3F0A_en.wem [36332 bytes] from 164054554A4456D7B62DD3B885FC3F0A_en.wem
LogWindows: Error: [CookWorker 2]: SavePackage Async write Saved/Cooked/Windows/Content/164054554A4456D7B62DD3B885FC3F0A_en.wem failed: The process cannot access the file because it is being used by another process.

So write when other processes hold the file read-open, and two:

LogWwiseFileHandler: Display: Wwise: Adding file 002897CF431531EA6393A49F74D03C5F_en.wem [40753 bytes] from 002897CF431531EA6393A49F74D03C5F_en.wem
LogWwiseFileHandler: Display: [CookWorker 0]: Wwise: Adding file 002897CF431531EA6393A49F74D03C5F_en.wem [40753 bytes] from 002897CF431531EA6393A49F74D03C5F_en.wem
LogWwiseFileHandler: Display: [CookWorker 1]: Wwise: Adding file 002897CF431531EA6393A49F74D03C5F_en.wem [40753 bytes] from 002897CF431531EA6393A49F74D03C5F_en.wem
LogWwiseFileHandler: Display: [CookWorker 2]: Wwise: Adding file 002897CF431531EA6393A49F74D03C5F_en.wem [40753 bytes] from 002897CF431531EA6393A49F74D03C5F_en.wem
LogFileManager: Warning: [CookWorker 2]: Error deleting file: Saved/Cooked/Windows/Content/002897CF431531EA6393A49F74D03C5F_en.wem (Error Code 32)

Which is an attempt to delete the file held by other process (error code 32 means other process uses the file)

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We are having the exact same issue still in 2024.1.8 latest version of wwise, any help would be greatly appreciated