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The issue was reported by Arfrever on #python-dev. The test suite of simpletal [1] was segfaulting with Python 3.3. It doesn't segfault without the _elementtree C extension.
I'm able to reproduce the issue. It may take a couple of runs with a debug build of Python but eventually Python segfaults. So far segfaults occur inside a GC collection run. Benjamin suspects the issue is related to the new GC code in _elementtree.
 #0 visit_decref (op=<unknown at remote 0x7fea64fc8ca8>, data=0x0) at Modules/gcmodule.c:361
 #1 0x00000000004bccd5 in subtract_refs (containers=<optimized out>) at Modules/gcmodule.c:386
 #2 collect (generation=0, n_collected=0x7fffe3eedb70, n_uncollectable=0x7fffe3eedb78) at Modules/gcmodule.c:891
 #3 0x00000000004bd7e6 in collect_with_callback (generation=0) at Modules/gcmodule.c:1048
 #4 collect_generations () at Modules/gcmodule.c:1071
 #5 _PyObject_GC_Malloc (basicsize=<optimized out>) at Modules/gcmodule.c:1580
 #6 0x00000000004bddcc in _PyObject_GC_Malloc (basicsize=<optimized out>) at Modules/gcmodule.c:1567
 #7 _PyObject_GC_New (tp=0x8322a0) at Modules/gcmodule.c:1590
 #8 0x0000000000548a3a in new_dict (values=0x0, keys=0xd02e60) at Objects/dictobject.c:395
 #9 _PyDict_NewPresized (minused=<optimized out>) at Objects/dictobject.c:1044
 #10 0x000000000047a449 in PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:2245
 #11 0x0000000000480b03 in fast_function (nk=<optimized out>, na=1, n=<optimized out>, pp_stack=0x7fffe3eede40, func=
 <function at remote 0x7fea653ff9e0>) at Python/ceval.c:4150
[1] http://www.owlfish.com/software/simpleTAL/downloads/SimpleTAL-5.1.tar.gz