[ZODB-Dev] Assertion failed: key != Py_None, file ZODB/cPickleCache.c, line 445

[Tim Hoffman]

Hi

In the last few days I have starting getting this error a lot
(which causes Zope (well python actually) to dump core)

Assertion failed: key != Py_None, file ZODB/cPickleCache.c, line 445

I am using Solaris 8, gcc 3.1, Python 2.1.3 and Zope 2.6.1 and CMF
1.4Beta1

It only occurrs when we try to retrieve an object through path traversal
when editing an object (we may have sucessfully edited the object a
dozen times before the error starts occuring (ie when calling
folder_edit_contents, or some other edit method, haven't got to trying
to actually update the object just retrieving it. All of the objects are
subclassed from portal_folder). Once this starts happening every time I
try to edit (not save, but retrieve) the object I get the above error.
If I copy the object, then the problem does not occur on the copy, but
continues on the original object, such that I have to and can delete it.

I am not really sure where to start looking. I plan on Monday to start 
putting debug code to try and isolate the conditions.

Has anyone else got any ideas on where to look?

RGds

Tim Hoffman