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This is the code that crashes:

from ctypes import *
print cast(c_void_p(0), POINTER(c_int))

***

#0  ffi_call_unix+0x20 ()
    at trunk/Modules/_ctypes/libffi/src/ia64/unix.S:63
#1  0x2000000079194d30:0 in ffi_call (cif=0x7fffe020,
fn=0x7913a860, 
    rvalue=0x7fffe090, avalue=0x7fffe070)
    at trunk/Modules/_ctypes/libffi/src/ia64/ffi.c:372
#2  0x20000000791762f0:0 in _call_function_pointer (flags=4101, 
    pProc=0x7913a860, avalues=0x7fffe070, atypes=0x7fffe050, 
    restype=0x40081de8, resmem=0x7fffe090, argcount=3)
    at trunk/Modules/_ctypes/callproc.c:665
#3  0x20000000791781d0:0 in _CallProc (pProc=0x7913a860,
argtuple=0x401cdd78, 
    flags=4101, argtypes=0x401ef7b8, restype=0x400eacd8,
checker=0x0)
    at trunk/Modules/_ctypes/callproc.c:1001
#4  0x2000000079165350:0 in CFuncPtr_call (self=0x4007abe8,
inargs=0x401cdd78, 
    kwds=0x0)
    at trunk/Modules/_ctypes/_ctypes.c:3364

***

Also note there are a bunch of errors like this:

Warning: could not import ctypes.test.test_cfuncs:
Unsatisfied code symbol '__divsf3' in load module
'trunk/build/lib.hp-ux-B.11.23-ia64-2.6/_ctypes_test.so'.