2 min read tech

AspNetCore.Identity.LiteDB breaks on Ubuntu

I have been building a small application for my book club. To make iterating easier I have decided to use the excellent LiteDB database to store all the data. Since the web application also needs to store user data, I have searched for a package that would let me use LiteDB as an identity backend. I have found AspNetCore.Identity.LiteDB,  which worked great, until I have tried to deploy it on my usual Ubuntu 18.04 LTS server.

On Windows it worked perfectly but on Ubuntu I have started getting these weird connection and socket errors at an alarming rate: 

System.InvalidOperationException: Handle is already used by another Socket.
   at System.Net.Sockets.SocketAsyncEngine.RegisterCore(IntPtr socketHandle, SocketAsyncContext context)
   at System.Net.Sockets.SocketAsyncEngine.RegisterSocket(IntPtr socketHandle, SocketAsyncContext context)
   at System.Net.Sockets.SocketAsyncContext.Register()
   at System.Net.Sockets.SocketAsyncContext.OperationQueue`1.StartAsyncOperation(SocketAsyncContext context, TOperation operation, Int32 observedSequenceNumber, CancellationToken cancellationToken)
   at System.Net.Sockets.SocketAsyncContext.ReceiveAsync(Memory`1 buffer, SocketFlags flags, Int32& bytesReceived, Action`5 callback, CancellationToken cancellationToken)
   at 
[ omitted ]  
Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.Internal.SocketConnection.DoReceive()
2021-03-09 20:12:41.218 +00:00 [Warning] Connection processing ended abnormally.
System.InvalidOperationException: Handle is already used by another Socket.
   at System.Net.Sockets.SocketAsyncEngine.RegisterCore(IntPtr socketHandle, SocketAsyncContext context)
   at System.Net.Sockets.SocketAsyncEngine.RegisterSocket(IntPtr socketHandle, SocketAsyncContext context)
   at System.Net.Sockets.SocketAsyncContext.Register()
[ omitted ]
Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequestsAsync[TContext](IHttpApplication`1 application)

That is to say, sometimes over 90% of requests ended with a Handle is already used by another Socket, or Connection processing ended abnormally.
System.InvalidOperationException: Handle is already used by another Socket.

For a long time I have been completely stumped. I have tried remote debugging, but that didn't work for me on Ubuntu - the debugger connected, then froze and died every time.

By the process of elimination I have eventually determined this identity nugget to be the culprit. And sure enough once I have removed it and replaced it completely with a sqlite equivalent, the issues disappeared.

I am not trying to bash on the package or its developer. It doesn't even seem to be in active development. It's also important to note that since I have encountered some bugs with it right from the start, I haven't used the version from NuGet - I built my own, with its LiteDB reference updated to 5.0.10. I'm just posting this in case someone else is googling for these errors.

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