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The compressed core dump is attached. The log had this:

    01-Dec-2019 12:47:08.950 general: critical: tcp.c:433: fatal error:
    01-Dec-2019 12:47:08.950 general: critical: RUNTIME_CHECK(result == 0) failed
    01-Dec-2019 12:47:08.950 general: critical: exiting (due to fatal error in library)

named -V:

    BIND 9.15.6 (Development Release) <id:a4d3fad>
    running on Linux x86_64 4.9.0-11-amd64 #1 SMP Debian 4.9.189-3+deb9u2 (2019-11-11)
    built by make with '--host=x86_64-linux-gnu' '--build=x86_64-linux-gnu' '--prefix=/' '--mandir=//usr/share/man' '--infodir=//usr/share/info' 'CFLAGS=-Wall -g -O2 -DISC_SOCKET_MAXSOCKETS=4096 -I/usr/include/postgresql/' '--sysconfdir=//etc' '--localstatedir=/var/named' '--enable-threads' '--enable-fetchlimit' '--enable-dnstap' '--bindir=//usr/bin' '--sbindir=//usr/sbin' '--exec_prefix=/' '--includedir=//usr/include' '--without-gost' '--with-libxml2=yes' '--with-dlz-postgres=/usr/include/postgresql' '--with-libjson=yes' '--libdir=//usr/lib' '--with-ecdsa' '--with-aes' '--with-docbook-xsl=/usr/share/xml/docbook/stylesheet/docbook-xsl' '--with-python=/usr/bin/python3' 'build_alias=x86_64-linux-gnu' 'host_alias=x86_64-linux-gnu'
    compiled by GCC 6.3.0 20170516
    compiled with OpenSSL version: OpenSSL 1.1.0l  10 Sep 2019
    linked to OpenSSL version: OpenSSL 1.1.0l  10 Sep 2019
    compiled with libxml2 version: 2.9.4
    linked to libxml2 version: 20904
    compiled with json-c version: 0.12.1
    linked to json-c version: 0.12.1
    compiled with zlib version: 1.2.8
    linked to zlib version: 1.2.8
    threads support is enabled

    default paths:
      named configuration:  //etc/named.conf
      rndc configuration:   //etc/rndc.conf
      DNSSEC root key:      //etc/bind.keys
      nsupdate session key: /var/named/run/named/session.key
      named PID file:       /var/named/run/named/named.pid
      named lock file:      /var/named/run/named/named.lock

Werner

core.bz2