Dear Sage support,
since a couple of hours I am fighting with a segmentation fault in a
Cython module. Can you help me?
I can boil it down to the following files:
1. Ccrash.h:
typedef unsigned char FEL;
typedef FEL *PTR;
typedef struct
{
long i;
long m;
} piv_t;
piv_t *_zfindpiv_(PTR row);
2. Ccrash.c:
#include "Ccrash.h"
piv_t *_zfindpiv_(PTR row)
{
piv_t *P;
P->i=0;
P->m=0;
return P;
}
3. Crash.pxd:
cdef extern from "Ccrash.h":
ctypedef unsigned char FEL
ctypedef FEL *PTR
ctypedef struct piv_t:
long i
long m
piv_t *_zfindpiv_(PTR row)
4. Crash.pyx:
def test():
cdef PTR row
print "Start"
cdef piv_t *P = _zfindpiv_(row)
print "Values", P.i, P.m
return (P.i,P.m)
I made a Crash.so, precisely:
> sage -cython Crash.pyx
> gcc -c -fPIC -I/home/king/SAGE/devel/sage-3.1.4/local/include/python2.5/
> Crash.c -o Crash.o
> gcc -shared Crash.o Ccrash.o -o Crash.so
I tried it with sage -gdb, but I need help for understanding its
output:
sage: from Crash import test
Error while mapping shared library sections:
./Crash.so: Datei oder Verzeichnis nicht gefunden.
Error while reading shared library symbols:
./Crash.so: Datei oder Verzeichnis nicht gefunden.
## Very strange, because ./Crash.so is present and is used in the next
line
sage: test()
Start
Values 0 0
(0, 0)
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 47137655676112 (LWP 6674)]
0x00000000004d0090 in frame_dealloc (f=0x3b04d00)
at Objects/frameobject.c:424
424 Objects/frameobject.c: Datei oder Verzeichnis nicht gefunden.
in Objects/frameobject.c
So, apparently the segmentation fault occurs *after* the values are
returned by test().
What has happened? Is Cython unable to deallocate P or row properly??
Thanks in advance for your help
Simon
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