[SciPy-dev] lstsq segfaults for scipy 0.9.5, numpy 0.9.5 on python 2.3

Albert Huang ashuang at gmail.com
Tue Mar 21 13:17:58 CST 2006


 Hi Nils,

I just tried it on numpy 0.9.6 and scipy 0.4.8 and the problem went away.
Thanks for taking a look so quickly, and sorry for the noise!

-albert

On 3/21/06, Nils Wagner <nwagner at mecha.uni-stuttgart.de> wrote:
>
> On Tue, 21 Mar 2006 14:00:08 -0500
>   "Albert Huang" <ashuang at gmail.com> wrote:
> > Hi,
> >
> > I'm using numpy 0.9.5 and scipy 0.9.5 with python 2.3 on
> >a debian (unstable)
> > system
> >
> > scipy.linalg.lstsq segfaults when I run this program:
> >
> > file:  testlstsq.py
> > ----
> > from numpy import *
> > from scipy.linalg import lstsq
> >
> > a = array( ((1,1), (1.1,0.9), (0.9,1.1), (0.8,1.2)) )
> > b = array( (2,2,2,2) )
> >
> > print lstsq(a,b)
> > ----
> >
> >
> >
> > stack trace:
> > # gdb python
> > GNU gdb 6.3-debian
> > Copyright 2004 Free Software Foundation, Inc.
> > GDB is free software, covered by the GNU General Public
> >License, and you are
> > welcome to change it and/or distribute copies of it
> >under certain
> > conditions.
> > Type "show copying" to see the conditions.
> > There is absolutely no warranty for GDB.  Type "show
> >warranty" for details.
> > This GDB was configured as "i386-linux"...(no debugging
> >symbols found)
> > Using host libthread_db library
> >"/lib/tls/libthread_db.so.1".
> >
> > (gdb) run testlstsq.py
> > Starting program: /usr/bin/python testlstsq.py
> > (no debugging symbols found)
> > (no debugging symbols found)
> > [Thread debugging using libthread_db enabled]
> > [New Thread -1209723200 (LWP 32526)]
> > (no debugging symbols found)
> > (no debugging symbols found)
> > (no debugging symbols found)
> > (no debugging symbols found)
> > (no debugging symbols found)
> > (no debugging symbols found)
> > (no debugging symbols found)
> > (no debugging symbols found)
> >
> > Program received signal SIGSEGV, Segmentation fault.
> > [Switching to Thread -1209723200 (LWP 32526)]
> > 0x08089aab in PyType_IsSubtype ()
> > (gdb) where
> > #0  0x08089aab in PyType_IsSubtype ()
> > #1  0xb7cd4941 in PyUFunc_GenericReduction
> >(self=0x819aa20, args=0xb6c1d2ac,
> >
> >    kwds=0x0, operation=0) at ufuncobject.c:2388
> > #2  0x08058c4e in PyObject_Call ()
> > #3  0xb7d14d2a in PyArray_GenericReduceFunction
> >(m1=0x828ed78, op=0x819aa20,
> >
> >    axis=Variable "axis" is not available.
> > ) at arrayobject.c:2465
> > #4  0xb7d2151b in PyArray_All (self=0x8, axis=1)
> >    at numpy/core/src/multiarraymodule.c:617
> > #5  0xb6d0cde7 in array_from_pyobj (type_num=12,
> >dims=0xbf8ee02c, rank=1,
> >    intent=12, obj=0x8113500) at
> >build/src/fortranobject.c:523
> > #6  0xb6cf3012 in f2py_rout_flapack_dgelss
> >(capi_self=0xb77627e8,
> >    capi_args=0xb6dde4cc, capi_keywds=0xb6c1ecec,
> >    f2py_func=0xb7281d40 <dgelss_>)
> >    at
> >build/src/build/src/Lib/lib/lapack/flapackmodule.c:2896
> > #7  0xb6d0c671 in fortran_call (fp=0xb77627e8,
> >arg=0xb6dde4cc,
> > kw=0xb6c1ecec)
> >    at build/src/fortranobject.c:267
> > #8  0x08058c4e in PyObject_Call ()
> > #9  0x080b437f in PyEval_GetFuncName ()
> > #10 0x080b8417 in PyEval_EvalCodeEx ()
> > #11 0x080b6b64 in PyEval_GetFuncName ()
> > #12 0x080b8417 in PyEval_EvalCodeEx ()
> > #13 0x080b8695 in PyEval_EvalCode ()
> > #14 0x080d935c in PyRun_FileExFlags ()
> > #15 0x080d9623 in PyRun_SimpleFileExFlags ()
> > #16 0x08054fc7 in Py_Main ()
> > #17 0xb7e67ed0 in __libc_start_main () from
> >/lib/tls/libc.so.6
> > #18 0x080549a1 in _start ()
> >
> >
> > Any suggestions?
> > -albert
>
> I cannot reproduce it here.
> (array([ 1.,  1.]), 1.4849602282430439e-32, 2, array([
> 2.83200503,  0.31582825]))
> >>> scipy.__version__
> '0.4.9.1742'
> >>> numpy.__version__
> '0.9.7.2257'
>
> Nils
>
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