[SciPy-user] f2py "Segmentation fault", please help

Robert Kern robert.kern@gmail....
Wed Jun 11 18:53:48 CDT 2008


On Wed, Jun 11, 2008 at 18:41, Kimberly Artita <kartita@gmail.com> wrote:
> Here is a dummy fortran/python code which highlights my problem:
>
> My fortran program readin_f90.f90:
> subroutine readin
>
> implicit none
>
> character(len=4) :: title(60)
>
> open (2,file="file.cio")
> print *, "file.cio opened"
> read (2,5100) title
> print *, title
>
> 5100 format (20a4)
>
> end subroutine
>
> My python code readin.py:
> from psyco import *
> full()

Can you try this without psyco? It might be complicating matters.

> from readin_f90 import *
>
> test_readin()
>
> My file file.cio:
> General Input/Output section (file.cio):           Wed Jul 18 15:50:10 2007
> AVSWAT2000 - SWAT interface MDL
>
>
>    basins.bsb   basins.sbs   basins.rch   basins.rsv   basins.lqo
> basins.wtr
>    basins.pso   basins.eve   basins.fig   basins.cod   basins.bsn
> basins.wwq
>      crop.dat     till.dat     pest.dat     fert.dat    urban.dat
>    1   1   3   3   3   3   0   0   0
>       pcp.pcp
>
>
>       tmp.tmp
>
>
>
> I generate the *.so file with: f2py -c -m readin_f90 readin_f90.f90
>
> kimi@localhost ~ $ python readin.py
> Gives this:
>  file.cio opened
> Segmentation fault
>
> Here the gdb output:
> kimi@localhost ~ $ gdb python
>
> (no debugging symbols found)
> (no debugging symbols found)
>  file.cio opened
>
> ---Type <return> to continue, or q <return> to quit---
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0xb7d2d6c0 (LWP 8055)]
> 0xb5c14885 in ?? () from
> /usr/lib/gcc/i686-pc-linux-gnu/4.2.3/libgfortran.so.2
> (gdb) backtrace
> #0  0xb5c14885 in ?? ()
>    from /usr/lib/gcc/i686-pc-linux-gnu/4.2.3/libgfortran.so.2
> #1  0xb7e5fff4 in ?? () from /lib/libc.so.6
> #2  0x00000000 in ?? ()
> (gdb)

If psyco isn't to blame, then it looks like a problem in gfortran's
libraries. On OS X with gfortran 4.2.0, I don't get a segfault.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
 -- Umberto Eco


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