[FS#251] sending SIGSEGV to dnsmasq for invalid read access from 00000000

[LEDE Bugs]

The following task has a new comment added:

FS#251 - sending SIGSEGV to dnsmasq for invalid read access from 00000000
User who did this - fuzzle (fuzzle)

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i build several lede in the last days - and at least on tplink 841 i never see this. (with some days uptime)
just something on gluon like this
Sat Dec  3 14:46:38 2016 daemon.crit dnsmasq[2095]: unknown user or group: dnsmasq
Sat Dec  3 14:46:38 2016 daemon.crit dnsmasq[2095]: FAILED to start up

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some dnsmasq is still running 
 1016 root      1116 S    /usr/sbin/dnsmasq -x /var/run/gluon-wan-dnsmasq.pid -u root -i lo -p 54 -h -r /var/gluon/wan-dnsmasq/resolv.conf

..
logread
Sat Dec  3 14:46:34 2016 daemon.crit dnsmasq[1985]: unknown user or group: dnsmasq
Sat Dec  3 14:46:34 2016 daemon.crit dnsmasq[1985]: FAILED to start up
Sat Dec  3 14:46:35 2016 user.notice firewall: Reloading firewall due to ifup of wan6 (br-wan)
Sat Dec  3 14:46:35 2016 daemon.warn fastd[1472]: sendmsg: Operation not permitted
Sat Dec  3 14:46:35 2016 daemon.warn fastd[1472]: sendmsg: Operation not permitted
Sat Dec  3 14:46:37 2016 daemon.info dnsmasq[1016]: reading /var/gluon/wan-dnsmasq/resolv.conf
Sat Dec  3 14:46:37 2016 daemon.info dnsmasq[1016]: using nameserver fd00::a96:d7ff:fe5d:1026#53
Sat Dec  3 14:46:37 2016 daemon.info dnsmasq[1016]: using nameserver 192.168.0.1#53
Sat Dec  3 14:46:37 2016 daemon.crit dnsmasq[2040]: unknown user or group: dnsmasq
Sat Dec  3 14:46:37 2016 daemon.crit dnsmasq[2040]: FAILED to start up
Sat Dec  3 14:46:38 2016 daemon.crit dnsmasq[2095]: unknown user or group: dnsmasq
Sat Dec  3 14:46:38 2016 daemon.crit dnsmasq[2095]: FAILED to start up
Sat Dec  3 14:46:38 2016 daemon.info procd: Instance dnsmasq::cfg02411c s in a crash loop 6 crashes, 0 seconds since last crash

this particular node:
Linux version 4.4.32 (fffr at v32412.1blu.de) (gcc version 5.4.0 (LEDE GCC 5.4.0 r2187+6) ) #0 Tue Sep 27 01:55:55 2016
based on https://kau.toke.dk/git/lede/commit/?id=18726b0ed2be546d1d2503c903d7d069ae5522d5
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=251#comment1018