[FS#324] DDNS spawns processes continously - LUCI web DDNS page hangs

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Mauro Mozzarelli (ezplanet) 

Attached to Project - LEDE Project
Summary - DDNS spawns processes continously - LUCI web DDNS page hangs
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on
 - Software versions of LEDE release, packages, etc.
 - Steps to reproduce
   
Device BTHomeHub5
Version: r2438
Configure DDNS with zzzz.io

LUCI web configure hangs
I had it previously configured. At boot it goes into loop and spanwns several ddns processes taking 100% resources.

It was fine in previous up to r2395 (which is the latest I tested before this one).

 2693 root      1188 S    -ash
 2905 root      1184 S    sh -c /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -- get_registered_ip
 2906 root      1356 S    {dynamic_dns_luc} /bin/sh /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -
 4298 root      1184 S    sh -c /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -- get_registered_ip
 4299 root      1356 S    {dynamic_dns_luc} /bin/sh /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -
 4478 root      1184 S    sh -c /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -- get_registered_ip
 4479 root      1356 S    {dynamic_dns_luc} /bin/sh /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -
 5461 root      1184 S    sh -c /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -- get_registered_ip
 5462 root      1356 S    {dynamic_dns_luc} /bin/sh /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -
13008 root      1184 S    sh -c /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -- get_registered_ip
13011 root      1356 S    {dynamic_dns_luc} /bin/sh /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -
18733 root      1184 S    sh -c /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -- get_registered_ip
18734 root      1356 S    {dynamic_dns_luc} /bin/sh /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -
23377 root      2988 S    {luci} /usr/bin/lua /www/cgi-bin/luci
24627 root      2816 S    {luci} /usr/bin/lua /www/cgi-bin/luci
25085 root      1184 S    sh -c /usr/lib/ddns/dynamic_dns_lucihelper.sh -V | awk {'print $2'}
25092 root      1236 S    {dynamic_dns_luc} /bin/sh /usr/lib/ddns/dynamic_dns_lucihelper.sh -V
25093 root      1188 S    awk {print $2}
25491 root      1184 S    sh -c /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet1.ddns.net -- get_registered_i
25493 root      1236 S    {dynamic_dns_luc} /bin/sh /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet1.ddns.net
25643 root      1184 R    ps
25704 root      1192 R    find /lib /usr/lib -name libcurl.so* -exec grep -i all_proxy {} ;
32188 root      1184 S    sh -c /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -- get_registered_ip
32193 root      1356 S    {dynamic_dns_luc} /bin/sh /usr/lib/ddns/dynamic_dns_lucihelper.sh -l ezplanet.zzzz.io -
32228 root      1128 S    /usr/sbin/dropbear -F -P /var/run/dropbear.1.pid -p 195.137.28.81:22 -p fdf6:5915:e8a5:

All of the above processes spawned in just a few seconds from boot!
At which point the router becomes unusable.


More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=324