From bug-request at octave dot org Tue Jan 31 06:49:46 2006
Subject: Octave_map segfault
From: Hugo MERCIER <hugo dot mercier at laposte dot net>
To: bug at octave dot org
Date: Tue, 31 Jan 2006 13:52:03 +0100

Hi,

  I have a problem with the use of Octave_map

  With the following function, written in C++ (mtest.cc) :

#include <octave/oct.h>
#include <octave/oct-map.h>
#include <octave/parse.h>

#include <iostream>

DEFUN_DLD(mtest, args, nargout,
	  "")
{
  octave_value_list retval;

  std::cout << args(0).is_map() << std::endl;
  const Octave_map& m = args(0).map_value();

  std::cout << m.length() << std::endl;

  return retval;
}


  Octave segfaults when attemping to call the Octave_map destructor
  Here is a gdb trace:

octave:1> k.j="t";
octave:2> mtest(k)
1
0

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1238288704 (LWP 3654)]
0xb63b6ab9 in free () from /lib/tls/libc.so.6
(gdb) bt
#0  0xb63b6ab9 in free () from /lib/tls/libc.so.6
#1  0xb6095d23 in operator delete () from /usr/lib/libstdc++.so.5
#2  0xb6095d7f in operator delete[] () from /usr/lib/libstdc++.so.5
#3  0xb71d014b in ~dim_vector_rep (this=0x8a5d2d8) at dim-vector.h:99
#4  0xb71cfc59 in ~dim_vector (this=0xbfa2c54c) at dim-vector.h:187
#5  0xb71cfbc9 in ~Octave_map (this=0xbfa2c540) at oct-map.h:76
#6  0xb71cf988 in Fmtest (args= at 0x8a98008, nargout=0) at mtest.cc:17
#7  0xb7b53451 in octave_builtin::do_multi_index_op ()
from /usr/lib/octave-2.1.72/liboctinterp.so
Previous frame inner to this frame (corrupt stack?)
(gdb) 


  I'm using Octave 2.1.72 (on Debian testing).
  Any idea ?

Thanks.



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