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When executing knot resolver in the docker container environment, defunct it by forking the process with 2 or more as the startup option. Moreover, since the timing to defunct is not fixed, I can not confirm what is the starting point.

env:

• base image: arm64v8/alpine:edge
• knot resolver 3.0.0

$ uname -srpi
Linux 4.4.154-1124-rockchip-ayufan-ged3ce4d15ec1 aarch64 aarch64

kresd
UID     PID    PPID    C   STIME    TTY      TIME                                  CMD                              
--------------------------------------------------------------------------------------------------------------------
root   27297   27278   0   11:29   ?       00:00:00   /usr/bin/dumb-init -- bash -c exec /usr/local/sbin/kresd -f 6
                                                      -c /etc/knot-resolver/kresd.conf                              
root   27387   27297   0   11:29   ?       00:00:09   /usr/local/sbin/kresd -f 6 -c /etc/knot-resolver/kresd.conf   
root   27392   27387   0   11:29   ?       00:00:06   /usr/local/sbin/kresd -f 6 -c /etc/knot-resolver/kresd.conf   
root   28030   27278   0   11:32   pts/0   00:00:00   ash  

root     27297  0.0  0.0    208     4 ?        Ss   11:29   0:00  |       \_ /usr/bin/dumb-init -- bash -c exec /usr/local/sbin/kresd -f 6 -c /etc/knot-resolver/kresd.conf
root     27387  0.0  1.7 3565688 68068 ?       Ss   11:29   0:09  |       |   \_ /usr/local/sbin/kresd -f 6 -c /etc/knot-resolver/kresd.conf
root     27388  0.1  0.0      0     0 ?        Z    11:29   0:18  |       |       \_ [kresd] <defunct>
root     27389  0.0  0.0      0     0 ?        Z    11:29   0:03  |       |       \_ [kresd] <defunct>
root     27390  0.0  0.0      0     0 ?        Z    11:29   0:03  |       |       \_ [kresd] <defunct>
root     27391  0.0  0.0      0     0 ?        Z    11:29   0:02  |       |       \_ [kresd] <defunct>
root     27392  0.0  1.6 3565644 65812 ?       S    11:29   0:06  |       |       \_ /usr/local/sbin/kresd -f 6 -c /etc/knot-resolver/kresd.conf
root     28030  0.0  0.0   1680     4 pts/0    Ss+  11:32   0:00  |       \_ ash

[system] bind to 'fe80::42:acff:fe20:8@53' Invalid argument
[system] bind to 'fe80::42:acff:fe20:8@53' Invalid argument
[system] bind to 'fe80::42:acff:fe20:8@53' Invalid argument
[system] bind to 'fe80::42:acff:fe20:8@53' Invalid argument
[system] bind to 'fe80::42:acff:fe20:8@53' Invalid argument
[system] bind to 'fe80::42:acff:fe20:8@53' Invalid argument
DNSSEC validation failure anipo.tv. DNSKEY
[prefill] root zone file valid for 01 hours 13 minutes, reusing data from disk
[prefill] root zone successfully parsed, import started
[prefill] root zone refresh in 01 hours 12 minutes
[ ta ] key: 19036 state: Valid
[ ta ] key: 20326 state: Valid
[ ta ] next refresh for . in 24 hours