[FS#464] Syslog dnsmasq errors, where dnsmasq thinks it is running as pid 1 (procd) when using ujail/seccomp

[LEDE Bugs]

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FS#464 - Syslog dnsmasq errors, where dnsmasq thinks it is running as pid 1 (procd) when using ujail/seccomp
User who did this - Kevin Darbyshire-Bryant (kdarbyshirebryant)

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I've been able to replicate this on an Archer C7 v2 MIPS box.  It's "interesting" because dnsmasq is still running (minus its ujail 'minder' process) and able to service queries, but procd has a few attempts at restarting and then gives up...as the new dnsmasq is unable to bind the port.

dnsmasq startup is increasingly hairy these days because a) it doesn't actually try to start at boot.  2) it starts on interface hotplug events of which there are probably quite a few.

The other 'fun' aspect of this is that the 'dnsmasq without ujail minder' wasn't killed when I tried /etc/init.d/dnsmasq stop.  I think that suggests procd has really lost track of it.

I suspect this is a race condition....which is going to be fun :-/
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=464#comment1633