Your long self-conversation is the most interesting thing to happen to this list in a long time... From: pythondotnet-bounces+btribble=ea.com@python.org [mailto:pythondotnet-bounces+btribble=ea.com@python.org] On Behalf Of Laszlo Sebo Sent: Wednesday, December 08, 2010 5:45 PM To: pythondotnet@python.org Subject: Re: [Python.NET] building on linux, mono 2.8.1 At the risk of having a long conversation here with myself... :) It appears that the crash happens in intobject.c of python, at the PyObject *PyInt_FromLong(long ival) function, when it tries to increment the reference counter: Py_INCREF(v); When python.net calls this function first, it calls it with the value of 0, which falls into a special handled range of integers that are dealt with in a small_ints[] array. However, that array never go initialized, so the reference counter crashes. The array would normally be initialized by calling _PyInt_Init(void). Sooo... just to test my theory, i exposed that function and called it explicitly from Python.Runtime.Initialize() and low and behold, import clr now works just fine! So i'll now go on a hunt, and make sure everything is initialized properly, i'm guessing some main init function isn't being called somewhere when using python.net from an embedded python. cheers, laszlo On 08/12/2010 1:35 PM, Laszlo Sebo wrote: Made a little bit of progress, but am now back to square one.. :) Basically, seems that the python embedded in nuke uses UCS4 instead of UCS2 which is the default when building python. So the python so's i had were using UCS2 while Nuke's internal python was using UCS4. I rebuilt python using the --enable-unicode=ucs4 flag, then rebuilt python.net. I hit another wall fairly soon, the mono config (dll remap) file wasn't being initialized, so i would be getting missing msvcrt dll errors on import clr. To fix that, i had to uncomment this line in pynetinit.c: //mono_config_parse(NULL); However, now i am back to the previous error i had: Stacktrace: at (wrapper managed-to-native) Python.Runtime.Runtime.PyInt_FromLong (intptr) <0x00060> at (wrapper managed-to-native) Python.Runtime.Runtime.PyInt_FromLong (intptr) <0xffffffff> at Python.Runtime.Runtime.PyInt_FromInt32 (int) <0x0006b> at Python.Runtime.Runtime.Initialize () <0x00433> at Python.Runtime.PythonEngine.Initialize () <0x00073> at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) <0xffffffff> oh well... anybody managed to get python.net working with UCS4 python? cheers, laszlo