Here's the traceback in gdb from the 10.6 case above:

(gdb) where
#0  0x00007fff891ba0b6 in __kill ()
#1  0x00007fff8925a9f6 in abort ()
#2  0x00000001001cd4fd in Py_FatalError (msg=Could not find the frame base for "Py_FatalError".
) at Python/pythonrun.c:2380
#3  0x000000010008ee41 in _PyMem_DebugCheckAddress (api=114 'r', p=0x100514bb0) at Objects/obmalloc.c:1857
#4  0x000000010008e9e5 in _PyMem_DebugFree (ctx=0x1002f6640, p=0x100514bb0) at Objects/obmalloc.c:1743
#5  0x000000010008cf72 in PyMem_RawFree (ptr=0x100514bb0) at Objects/obmalloc.c:270
#6  0x00000001001f3324 in calculate_path () at ./Modules/getpath.c:557
#7  0x00000001001f3cce in Py_GetProgramFullPath () at ./Modules/getpath.c:867
#8  0x00000001001dabc0 in _PySys_Init () at ./Python/sysmodule.c:1619
#9  0x00000001001c727e in _Py_InitializeEx_Private (install_sigs=1, install_importlib=1) at Python/pythonrun.c:352
#10 0x00000001001c7555 in Py_InitializeEx (install_sigs=1) at Python/pythonrun.c:419
#11 0x00000001001c7565 in Py_Initialize () at Python/pythonrun.c:425
#12 0x00000001001f5698 in Py_Main (argc=1, argv=0x1005060e0) at Modules/main.c:673
#13 0x0000000100001090 in main (argc=1, argv=0x7fff5bfffbe0) at ./Modules/python.c:63