external script in <defunct> state

[rashad]

I wan to run external script when Acct-Stop packets received. My acct_users
file:

DEFAULT Acct-Status-Type == Stop
        Exec-Program = "/usr/local/sbin/testacct.php"

Script runs and executes normally but stays in <defunct> state for every
call:

5154 ?        Z      0:00 [testacct.php <defunct>]
5159 ?        Z      0:00 [testacct.php <defunct>]
5161 ?        Z      0:00 [testacct.php <defunct>]
......


Where is the mistake can be?