[Dnsmasq-discuss] Potential bug: dnsmasq hangs after a certain time

[Felix Queißner]

Hello List!

I deployed a dnsmasq installation[0] in a Docker container that is built 
on top of debian and the s6-overlay software. It also contains a custom 
software that reads data from a mariadb and writes the dnsmasq config files.

This software will then send the HUP signal to dnsmasq when the config 
files change.

The problem will then appear one to three days later and dnsmasq will 
just stop working. The process won't exit, and doesn't react to signals 
anymore. Only using `kill` with SIGKILL will stop dnsmasq, which is then 
restarted by s6. dnsmasq will not answer any DHCP or DNS requests in 
that time.

Is that a known bug? Is this a new one? Can i somehow help 
reproducing/debugging the bug? I have experience in C development, so i 
can use gdb if it is required/wanted.

Best regards
- Felix "xq" Queißner


[0]
Dnsmasq version 2.85  Copyright (c) 2000-2021 Simon Kelley
Compile time options: IPv6 GNU-getopt DBus no-UBus i18n IDN2 DHCP DHCPv6 
no-Lua TFTP conntrack ipset auth cryptohash DNSSEC loop-detect inotify 
dumpfile