DefaultSelector().select() in selectors module fails on ironpython

[xiaxinmeng]

In th following test.py, we set timeout argument of selectors.DefaultSelector().select() to 2. Ironpython crashes.

test.py

import selectors 
selectors.DefaultSelector().select(timeout=2)

Error message:

>>'ironpython/ironpython3/bin/Debug/net6.0/ipy' test.py
.....
/DLR/Src/Microsoft.Dynamic/Hosting/Shell/ConsoleHost.cs:line 321
   at PythonConsoleHost.ExecuteInternal() in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/IronPythonConsole/Console.cs:line 165
   at Microsoft.Scripting.Hosting.Shell.ConsoleHost.Execute() in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/DLR/Src/Microsoft.Dynamic/Hosting/Shell/ConsoleHost.cs:line 299
   at Microsoft.Scripting.Hosting.Shell.ConsoleHost.Run(String[] args) in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/DLR/Src/Microsoft.Dynamic/Hosting/Shell/ConsoleHost.cs:line 197
   at PythonConsoleHost.Main(String[] args) in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/IronPythonConsole/Console.cs:line 199
Aborted (core dumped)

System info:
ironpython3-debug(main branch):IronPython 3.4.0b1 DEBUG (3.4.0.0010)[.NETCoreApp,Version=v6.0 on .NET 6.0.11 (64-bit)] on linux
operating system: Ubuntu 18.04.6 LTS

[slozier]

Thanks! Seems to hit an assertion error in debug mode.