Infinite loop of malloc Double

Bug report for Octave 2.1.64 configured for powerpc-apple-darwin

Description:
-----------

It's about as simple as they come. The first gplot command works fine, 
the same gplot command through exec causes the infinite loop of death.


Welcome to Darwin!
taos:~ hamish$ octave
GNU Octave, version 2.1.64 (powerpc-apple-darwin).
Copyright (C) 2004 John W. Eaton.
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octave:1> gset term aqua
octave:2> gplot '2*x+1'
octave:3> exec("gplot '2*x+1'")
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free
*** malloc[28062]: error for object 0x634b90: Double free

Repeat-By:
---------

Typing just what I typed above.

Fix:
---

Don't know, sorry!

Configuration (please do not edit this section):
-----------------------------------------------

uname output:     Darwin taos 7.9.0 Darwin Kernel Version 7.9.0: Wed 
Mar 30 20:11:17 PST 2005; root:xnu/xnu-517.12.7.obj~1/RELEASE_PPC  
Power Macintosh powerpc
configure opts:   '--prefix=/sw' '--with-g77' 
'--infodir=/sw/share/info' '--mandir=/sw/share/man' 
'--libexecdir=/sw/lib' '-enable-shared' '-enable-dl' '--disable-static' 
'--build=powerpc-apple-darwin' 'CC=gcc-3.3' 'CPPFLAGS=-no-cpp-precomp 
-I/sw/include' 'CXX=g++-3.3' 'LDFLAGS=-L/sw/lib' 
'build_alias=powerpc-apple-darwin'
Fortran compiler: g77
FFLAGS:           -O
F2C:
F2CFLAGS:
FLIBS:            -L/sw/lib -lg2c
CPPFLAGS:         -no-cpp-precomp -I/sw/include
INCFLAGS:         -I. -I. -I./liboctave -I./src -I./libcruft/misc  
-I./glob -I./glob
C compiler:       gcc-3.3, version 3.3 20030304 (Apple Computer, Inc. 
build 1640)
CFLAGS:           -g -O2
CPICFLAG:
C++ compiler:     g++-3.3, version 3.3
CXXFLAGS:         -g -O2
CXXPICFLAG:
LD_CXX:           g++-3.3
LDFLAGS:          -L/sw/lib
LIBFLAGS:         -L.
RLD_FLAG:
BLAS_LIBS:        -framework vecLib
FFTW_LIBS:        -lfftw3
LIBS:             -lreadline  -lncurses -lhdf5 -lz -lm
LEXLIB:
LIBPLPLOT:
LIBDLFCN:
LIBGLOB:          ./glob/glob.o ./glob/fnmatch.o
SED:              /usr/bin/sed
DEFS:

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