[SciPy-dev] segmentation fault in latest cvs using scipy.test()

Nils Wagner nwagner at mecha.uni-stuttgart.de
Tue Nov 30 03:36:48 CST 2004


Pearu Peterson wrote:

>
>
> On Tue, 30 Nov 2004, Nils Wagner wrote:
>
>>> Which test crashes python, check_syevd or check_heevd?
>>>
>> Python 2.3.3 (#1, Apr  6 2004, 01:47:39)
>> [GCC 3.3.3 (SuSE Linux)] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>>
>>>>> import scipy
>>>>> scipy.lib.lapack.test(verbosity=10)
>>>>
>>  !! No test file 'test_flapack.py' found for <module 
>> 'scipy.lib.lapack.flapack' from '...es/scipy/lib/lapack/flapack.so'>
>>  !! No test file 'test_clapack.py' found for <module 
>> 'scipy.lib.lapack.clapack' from '...es/scipy/lib/lapack/clapack.so'>
>> Found 6 tests for scipy.lib.lapack
>>  !! No test file 'test_calc_lwork.py' found for <module 
>> 'scipy.lib.lapack.calc_lwork' from '...scipy/lib/lapack/calc_lwork.so'>
>> Found 0 tests for __main__
>> check_gebal (scipy.lib.lapack.test_lapack.test_flapack_simple) ... ok
>> check_gehrd (scipy.lib.lapack.test_lapack.test_flapack_simple) ... ok
>> Segmentation fault
>
>
> Now try
>
> scipy.lib.lapack.flapack.zheev([[1,2,3],[2,2,3],[3,3,6]])
> scipy.lib.lapack.flapack.zheevd([[1,2,3],[2,2,3],[3,3,6]])
> scipy.lib.lapack.flapack.cheev([[1,2,3],[2,2,3],[3,3,6]])
> scipy.lib.lapack.flapack.cheevd([[1,2,3],[2,2,3],[3,3,6]])
> scipy.lib.lapack.flapack.dsyev([[1,2,3],[2,2,3],[3,3,6]])
> scipy.lib.lapack.flapack.dsyevd([[1,2,3],[2,2,3],[3,3,6]])
> scipy.lib.lapack.flapack.ssyev([[1,2,3],[2,2,3],[3,3,6]])
> scipy.lib.lapack.flapack.ssyevd([[1,2,3],[2,2,3],[3,3,6]])
>
> Which one is causing python crash? 

 >>> scipy.lib.lapack.flapack.cheev([[1,2,3],[2,2,3],[3,3,6]])
Segmentation fault
 >>> scipy.lib.lapack.flapack.cheevd([[1,2,3],[2,2,3],[3,3,6]])
Segmentation fault


> And which one is not?
>
> If they do, then build lib.lapack package against Fortran BLAS/LAPACK 
> libraries and try the tests again. Here are basic steps (fix the paths 
> in BLAS_SRC and LAPACK_SRC to your setup):
>
> $ cd Lib/lib/lapack
> $ rm -rf build
> $ ATLAS=None BLAS=None LAPACK=None BLAS_SRC=~/src/blas \
>    LAPACK_SRC=~/src/LAPACK/ python setup_lapack.py build
> $ python tests/test_lapack.py -v 10
>
> If you still get a crash, build lib.lapack without optimization:
>
> $ rm -rf build
> $ ATLAS=None BLAS=None LAPACK=None BLAS_SRC=~/src/blas \
>    LAPACK_SRC=~/src/LAPACK/ python setup_lapack.py build config_fc 
> --noopt
> $ python tests/test_lapack.py -v 10
>
> If this works then we are dealing with gcc optimization bug.
>
>
> HTH,
> Pearu
>
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