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This is a regression from !582 (merged) (bisected down to it), and only happens when running under Visual Studio with the debugger attached.

If a C++ exception inside a C++ application is thrown, everything works fine. However, if a C# exception is thrown inside a C# application, some sort of infinite loop/recursive call happens causing high CPU usage and the application becomes unresponsive. This happens even if the exception is thrown inside a try .. catch block and discarded:

using GLib;

static void Main()
{
    GLib.GType.Init();

    try
    {
        object o = null;
        o.ToString();
    }
    catch (Exception)
    {
        // Ignore exception
        //throw;
    }
}

Happens in both managed code debugging mode and native code debugging mode.

CC: @lrn