ksh memory leak

Issue

• Ksh leaks memory when it is running scripts.
• There are three types of action that causes memory leak.
• case1: Nested command substitutions
  Memory leak was fixed in ksh-20120801-1.el6 or later.

#!/bin/ksh

pmap -x $$ |tail -1
### case 1###
#nested comannd subsititustions
while :; do
    a=`expr 1 + \`expr 1 + 1\``
    pmap -x $$ |tail -1
done

• case2: alias

#!/bin/ksh

###case 2###
#alias
alias ls='ls -ltr'

while :; do
    a=`ls`
    pmap -x $$ |tail -1
done

• case3: function call via autoload

#!/usr/bin/ksh

function func1
{
    echo "func1 call";
}

#!/bin/ksh

###case 3###
#function call via autoload
FPATH=.
autoload func1

while :; do
    a=`func1`
    pmap -x $$ |tail -1
done