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segmentation fault in unset typeset array variable


From: Nathan (Acorn) Pooley
Subject: segmentation fault in unset typeset array variable
Date: 15 Aug 2004 21:40:22 -0700

Configuration Information [Automatically generated, do not change]:
Machine: i386
OS: linux-gnu
Compiler: i386-redhat-linux-gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i386'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i386-redhat-linux-gnu'
-DCONF_VENDOR='redhat' -DSHELL -DHAVE_CONFIG_H  -I.  -I. -I./include
-I./lib -D_GNU_SOURCE  -O2 -march=i386 -mcpu=i686 -g
uname output: Linux silverdragon 2.6.5 #5 Tue Apr 27 00:39:37 PDT 2004
i686 i686 i386 GNU/Linux
Machine Type: i386-redhat-linux-gnu

Bash Version: 2.05b
Patch Level: 0
Release Status: release

Description:
        If a variable is typeset in a bash function, then unset, 
        then used with the address@hidden syntax it causes a segmentation
        violation.

Repeat-By:
        Create the following function, then run the function (I 
        suggest you run this in a subshell by putting it in a
        file and then running the file, or else the crash will kill
        your terminal session):

                bugfunc() {
                        typeset listvar
                        unset listvar
                        echo "address@hidden"
                }

                bugfunc

Fix:
        This is pretty obscure and easily worked around (eg by 
        just not doing it),  but I thought you might be 
        interested.  The segfault only occurs when the variable
        is typeset; otherwise there is no problem.








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