using System.Runtime.InteropServices;
using System.Security;
using System;

public class TexTest {
       [DllImport("GL", EntryPoint="glGenTextures"), SuppressUnmanagedCodeSecurity, CLSCompliantAttribute(false)]
       public static extern void glGenTextures (int n, [Out] uint [] textures);

       public static  void Main (string [] args) 
       {
		uint [] ids = new uint [1];

		Console.WriteLine ("testing");

		glGenTextures (1, ids);

		Console.WriteLine ("done");
       }
}

Stacktrace:

  at (wrapper managed-to-native) TexTest.glGenTextures (int,uint[]) <0x0000e>
  at (wrapper managed-to-native) TexTest.glGenTextures (int,uint[]) <0xffffffff>  at TexTest.Main (string[]) <0x00048>
  at (wrapper runtime-invoke) System.Object.runtime_invoke_void_string[] (object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:


Unhandled Exception: System.NullReferenceException: A null value was found where an object instance was required.
  at <0x00000> <unknown method>
  at (wrapper managed-to-native) TexTest:glGenTextures (int,uint[])
  at TexTest.Main (System.String[] args) [0x00000]

** ERROR **: file mini-exceptions.c: line 982 (mono_free_altstack): assertion failed: (err == 0)
aborting...
Aborted