It looks like a bug in the uno module, nobody reports this issue with the vanilla Python.

The gdb traceback is incomplete: function parameters are missing, there are some unknown frames ("??"):

#0  0x011c118d in PyUnicode_InternInPlace ()
   from /Applications/LibreOffice.app/Contents/MacOS/LibreOfficePython.framework/Versions/3.3/LibreOfficePython
#1  0x011cf981 in PyUnicode_InternFromString ()
   from /Applications/LibreOffice.app/Contents/MacOS/LibreOfficePython.framework/Versions/3.3/LibreOfficePython
#2  0x011b5498 in PyType_Ready ()
   from /Applications/LibreOffice.app/Contents/MacOS/LibreOfficePython.framework/Versions/3.3/LibreOfficePython
#3  0x011b613c in PyType_Ready ()
   from /Applications/LibreOffice.app/Contents/MacOS/LibreOfficePython.framework/Versions/3.3/LibreOfficePython
#4  0x00708abb in pyuno::PyUNO_initType() () from /Applications/LibreOffice.app/Contents/MacOS/libpyuno.dylib
#5  0x003f7ee0 in ?? () from /Applications/LibreOffice.app/Contents/MacOS/pyuno.so
#6  0x0070f9f2 in PyInit_pyuno () from /Applications/LibreOffice.app/Contents/MacOS/libpyuno.dylib
#7  0x00000009 in ?? ()

You should try to get debug symbols. It looks like you are working on Mac OS X. How did you install Python? Are you sure that the "uno" module is compatible with python 3.3 program? (Compiled with the same options.)

To me, it doesn't look like a Python bug. And it doesn't look to be related to Unicode.