[SciPy-dev] import scipy -> SIGSEGV?

Alok Singhal as8ca at virginia.edu
Tue Apr 13 17:27:20 CDT 2004

Hi all,

OK, I have spent two days trying to figure out what the problem migh
be, but I give up.  I installed scipy on a Redhat 9 system (as a user
in my home directory), and when I do:

$ python
>>> import scipy

It says:

Segmentation fault

The core dump shows SIGSEGV is received in fastumath_unsigned.inc,
line 2858:

add_functions[11] = PyUFunc_OO_O;

The relevant backtrace is:

#0  InitOperators (dictionary=0x81b75a4) at fastumath_unsigned.inc:2858
#1  0x40078f9f in initfastumath () at /users/asinghal/SciPy-0.2.0_alpha_200.4161/scipy_core/scipy_base/fastumathmodule.c:92
#2  0x080921ef in _PyImport_LoadDynamicModule ()
#3  0x08090003 in PyImport_ExecCodeModuleEx ()

(gdb) p add_functions[10]
$2 = 0x4006f180 <CDOUBLE_add>
(gdb) p add_functions[11]
$3 = 0
(gdb) p &add_functions[11]
$4 = (PyUFuncGenericFunction *) 0x4007bbcc

Line 2722 of scipy_core/scipy_base/fastumath_unsigned.inc defines
add_functions to be a 12 element array, so an assignment to
add_functions[11] should work.

I used the SciPy-0.2.0_alpha_200.4161_src.zip code to compile scipy.

I am using the following:

- Python 2.2.2 (RPM python-2.2.2-26)
- Numeric 23.1
- ATLAS 3.6.0 (+LAPACK)
- f2py 2.39.235_1693
- fftw 3.0.1 (though it failed to detect fftw during installation of
- gcc (GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)

Importing Numeric works fine.  I am not sure where the problem is, but
if you need any other information, I will be glad to provide it.


Alok Singhal (as8ca at virginia.edu)          *   *          
Graduate Student, dept. of Astronomy   *           *     *
University of Virginia                                    
http://www.astro.virginia.edu/~as8ca/              *    * 

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