AND after installing cairo-dbg:
(gdb) run
Starting program: /usr/bin/python2.6-dbg cairo_actor_segfault.py
[Thread debugging using libthread_db enabled]
/usr/bin/python2.6-dbg: symbol lookup error: /usr/lib/pymodules/python2.6/gtk-2.0/glib/_glib.so: undefined symbol: Py_InitModule4

Program exited with code 0177.





$ gdb --args python2.6-dbg cairo_actor_segfault.py
GNU gdb (GDB) 7.0-ubuntu
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/python2.6-dbg...done.
(gdb) run
Starting program: /usr/bin/python2.6-dbg cairo_actor_segfault.py
[Thread debugging using libthread_db enabled]
Traceback (most recent call last):
  File "cairo_actor_segfault.py", line 3, in <module>
    import cairo
  File "/usr/lib/pymodules/python2.6/cairo/__init__.py", line 1, in <module>
    from _cairo import *
ImportError: /usr/lib/pymodules/python2.6/cairo/_cairo.so: undefined symbol: Py_InitModule4
[15031 refs]

Program exited with code 01.









(gdb) bt full
#0  0x0033d9ce in ?? ()
No symbol table info available.



(gdb) bt
#0  0x0033d9ce in ?? ()

AND FULL RUN:
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y

Starting program: /usr/bin/python cairo_actor_segfault.py
[Thread debugging using libthread_db enabled]
/usr/lib/pymodules/python2.6/clutter/__init__.py:66: Warning: g_set_prgname() called multiple times
  _clutter.init()

Program received signal SIGSEGV, Segmentation fault.
0x0033d9ce in ?? ()