Description:
------------
For PHP v8.0.2, Test case "Bug #73594 (dns_get_record() does not populate $additional out parameter) [ext/standard/tests/network/bug73594.phpt]" failed on SLES 12SP5, s390x. 

I noticed that this TC is getting skipped on most distros for x86 and s390x due to one or the other SKIPIF reasons.
For my case, I took a tcpdump to confirm that DNS response had values in $additional. This was also confirmed by dig command but the TC is still failing..

"php > var_dump(!empty($res) && empty($additional));" is expected to return "bool(true)" but is returning "bool(false)". 
Please refer below snapshot for result of dig command and the Test case.. I can see that dns_get_record() is also returning value in $additional.
fyre@rotators1:~/php-8.0.2> php -a
Interactive shell

php > $ret = 0;
php > exec("dig -tmx php.net +noall +additional 2>/dev/null", $out, $ret);
php > var_dump($ret);
int(0)
php > $out = preg_grep("/^(?!($|;))/", $out);
php > var_dump($out);
array(26) {
  [0]=>
  string(44) "i.gtld-servers.net.       74061   IN      A       192.43.172.30"
  [1]=>
  string(43) "g.gtld-servers.net.       18269   IN      A       192.42.93.30"
  [2]=>
  string(43) "l.gtld-servers.net.       2876    IN      A       192.41.162.30"
  [3]=>
  string(43) "k.gtld-servers.net.       4222    IN      A       192.52.178.30"
.
.
.
  [25]=>
  string(52) "b.gtld-servers.net.       4042    IN      AAAA    2001:503:231d::2:30"
}
php >
php > $auth = array();
php > $additional = array();
php > $res = dns_get_record('php.net', DNS_MX, $auth, $additional);
php > var_dump(!empty($res) && empty($additional));
bool(false)
php > var_dump($res);
array(1) {
  [0]=>
  array(6) {
    ["host"]=>
    string(7) "php.net"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(30)
    ["type"]=>
    string(2) "MX"
    ["pri"]=>
    int(0)
    ["target"]=>
    string(21) "php-smtp4-ip4.php.net"
  }
}
php > var_dump($additional);
array(28) {
  [0]=>
  array(5) {
    ["host"]=>
    string(18) "i.gtld-servers.net"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(74061)
    ["type"]=>
    string(1) "A"
    ["ip"]=>
    string(13) "192.43.172.30"
  }
  [1]=>
  array(5) {
    ["host"]=>
    string(18) "g.gtld-servers.net"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(18269)
    ["type"]=>
    string(1) "A"
    ["ip"]=>
    string(12) "192.42.93.30"
  }
.
.
  [27]=>
  array(5) {
    ["host"]=>
    string(18) "i.gtld-servers.net"
    ["class"]=>
    string(2) "IN"
    ["ttl"]=>
    int(15164)
    ["type"]=>
    string(4) "AAAA"
    ["ipv6"]=>
    string(17) "2001:503:39c1::30"
  }
}
php >

Can you please give me a pointer to why this TC might be failing? Could this be a bug in the test case or in php code?

Test script:
---------------
To reproduce:
php -f php-8.0.2/ext/standard/tests/network/bug73594.phpt

OR

You can run this to check all values on php shell:

<?php
$ret = 0;
exec("dig -tmx php.net +noall +additional 2>/dev/null", $out, $ret);
var_dump($ret);
$out = preg_grep("/^(?!($|;))/", $out);
var_dump($out);

$auth = array();
$additional = array();
$res = dns_get_record('php.net', DNS_MX, $auth, $additional);
// only check $additional if dns_get_record is successful
var_dump(!empty($res) && empty($additional));
var_dump($res);
var_dump($additional);
?>


Expected result:
----------------
The Test case should pass.