Cannot await Task.Delay with .Net Core under Linux

Question

This very simple code does not work the same under Linux as it does on my Windows machine:

    class Program
    {
        async static Task Main(string[] args)
        {
            Console.WriteLine("Hello World!");

            for (int i = 0; i < 5; i++)
            {
                await Task.Delay(TimeSpan.FromSeconds(1));
                Console.WriteLine("" + i);
            }

            Console.WriteLine("Bye bye");
        }
    }

This should produce an output like

Hello World

0

1

.. 

4

Bye bye

It works well in development and if published to Windows. If published for Linux it hangs after putting out 'Hello World'. The await Task.Delay() never returns.

I've tried with a fresh installation of Ubuntu 18 and CentOS 7. I've tried with ASP.Net Core 3.0 runtime and 3.1 (also both fresh installations).

This code is only for demonstration purposes. Originally, I started to have problems when using a System.Threading.Timer in an ASP.Net BackgroundService (registered via services.AddHostedService()). The timer's callback there also didn't got called. That also happened only under Linux, whereas Windows works well.

Does anyone have an idea how to approach this problem?

Update After the comment from Herohtar I've tested on a Windows subsystem Ubuntu. It is working there as well. Now I suspect the Linux image(s) of my hoster (virtual server at Strato.de) is somehow crippled.

Can someone think of a limitation in Linux that could cause such issues?

Answer 1

After getting response from Strato I can post the answer to my own question here: Strato is using Virtuozzo for their virtualization. For security reasons they have also disabled some features so that .Net core ist not running there.

For everyone else having the same problem: You can't use .Net core on Strato Linux V-Servers at all.

Thaks to everyone trying to help!