NetMQConfig.Cleanup() hangs forever even after dispose

[Sahasrara]

Environment

NetMQ Version:   4.0.1.10
Operating System: macOS 12.6
.NET Version: Unity 2022.1.21f1

Expected behaviour

I would expect the program not to block forever.

Actual behaviour

The program blocks forever.

Steps to reproduce the behaviour

    public static void ZeroMQ()
    {
	    try
	    {
		    TimeSpan timeout = TimeSpan.FromMilliseconds(2000);
		    AsyncIO.ForceDotNet.Force();
		    using (PairSocket client = new PairSocket("tcp://127.0.0.1:5555"))
		    {
                            client.Options.Linger = TimeSpan.Zero;
			    bool success = client.TrySendFrame(timeout, "Hello");
			    Debug.Log($"Success = {success}");
			    string msg = string.Empty;
			    success = client.TryReceiveFrameString(timeout, out msg);
			    Debug.Log($"Success = {success} - {msg}");
			    success = client.TryReceiveFrameString(timeout, out msg);
			    Debug.Log($"Success = {success} - {msg}");
		    }
	    }
	    catch (Exception e)
	    {
		    Debug.Log(e);
	    }
	    finally
	    {
		    NetMQConfig.Cleanup();
	    }
    }

[follesoe]

Experiencing the same issue on macOS and Xamarin.

[waterpare833]

I'm currently experiencing the same issue on macOS.

[Archtica]

I have the same issue on NetMQ 4.0.1.13 - macOS. Everything is fine on Windows.
Unity 2022.3.38f

[mlbishop]

I am also experiencing the same with the version of NetMQ mentioned above (4.0.1.13) on macOS.

According to the docs, the cleanup method can hang forever if a socket does not get disposed before calling it. Surprisingly I witness this even if I call the non-blocking cleanup NetMQConfig.Cleanup(false). This would point to the socket not getting correctly disposed, which also produces other errors in my application. After the configurable socket limit (I have left it at the default 1024), I get this exception:

Exception occurred: Exception of type 'NetMQ.NetMQException' was thrown. with error code: TooManyOpenSockets

Will this issue be worked on in any upcoming releases?