[Bug 245653] dns/bind916 crashes on 12.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245653

            Bug ID: 245653
           Summary: dns/bind916 crashes on 12.1
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: mat at FreeBSD.org
          Reporter: lysfjord.daniel at smokepit.net
          Assignee: mat at FreeBSD.org
             Flags: maintainer-feedback?(mat at FreeBSD.org)

Packages built by poudriere.

I upgraded bind916 to 9.16.2 from 9.16.1, upon restarting bind, the following
log entries appeared in /var/log/messages: (the built with is identical between
9.16.2 and 9.16.1)

named 55088 - - starting BIND 9.16.2 (Stable Release) <id:b310dc7>
named 55088 - - running on FreeBSD amd64 12.1-RELEASE-p2 FreeBSD
12.1-RELEASE-p2 GENERIC
named 55088 - - built with '--disable-linux-caps' '--localstatedir=/var'
'--sysconfdir=/usr/local/etc/namedb' '--with-dlopen=yes' '--with-libxml2'
'--with-openssl=/usr/local' '--with-readline=-L/usr/local/lib -ledit'
'--with-dlz-filesystem=yes' '--disable-dnstap' '--disable-fixed-rrset'
'--disable-geoip' '--without-maxminddb' '--without-gssapi'
'--with-libidn2=/usr/local' '--with-json-c' '--disable-largefile'
'--with-lmdb=/usr/local' '--disable-native-pkcs11' '--without-python'
'--disable-querytrace' 'STD_CDEFINES=-DDIG_SIGCHASE=1' '--enable-tcp-fastopen'
'--with-tuning=default' '--disable-symtable' '--prefix=/usr/local'
'--mandir=/usr/local/man' '--infodir=/usr/local/share/info/'
'--build=amd64-portbld-freebsd12.1' 'build_alias=amd64-portbld-freebsd12.1'
'CC=cc' 'CFLAGS=-O2 -pipe -march=skylake -DLIBICONV_PLUG
-fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing '
'LDFLAGS= -L/usr/local/lib -ljson-c -Wl,-rpath,/usr/local/lib
-fstack-protector-strong ' 'LIBS=-L/usr/local/lib' 'CPPFLAGS=-DLIBICONV_PLUG
-isystem /usr/local/include' 'CPP=cpp' 'PKG_CONFIG=pkgconf'
named 55088 - - running as: named -4 -u bind -c
/usr/local/etc/namedb/named.conf
named 55088 - - compiled by CLANG 4.2.1 Compatible FreeBSD Clang 8.0.1
(tags/RELEASE_801/final 366581)
named 55088 - - compiled with OpenSSL version: LibreSSL 3.0.2
named 55088 - - linked to OpenSSL version: LibreSSL 3.0.2
named 55088 - - compiled with libxml2 version: 2.9.10
named 55088 - - linked to libxml2 version: 20910
named 55088 - - compiled with json-c version: 0.13.1
named 55088 - - linked to json-c version: 0.13.1
named 55088 - - compiled with zlib version: 1.2.11
named 55088 - - linked to zlib version: 1.2.11
-----8<----SNIP ZONE LOADING---->8-----
named 55088 - - command channel listening on 127.0.0.1#953
kernel: [6745829] pid 55088 (named), jid 0, uid 53: exited on signal 6


The following lines appeared in /var/log/bind/named.log:
16-Apr-2020 00:51:34.182 general: critical: netmgr.c:995:
REQUIRE(worker->recvbuf_inuse) failed, back trace
16-Apr-2020 00:51:34.182 general: critical: #0 0x2cae20 in ??
16-Apr-2020 00:51:34.182 general: critical: #1 0x4a8e4a in ??
16-Apr-2020 00:51:34.182 general: critical: #2 0x4be749 in ??
16-Apr-2020 00:51:34.182 general: critical: #3 0x4c2b11 in ??
16-Apr-2020 00:51:34.182 general: critical: #4 0x800923c00 in ??
16-Apr-2020 00:51:34.182 general: critical: #5 0x800925dda in ??
16-Apr-2020 00:51:34.182 general: critical: #6 0x800915321 in ??
16-Apr-2020 00:51:34.182 general: critical: #7 0x4bcb74 in ??
16-Apr-2020 00:51:34.182 general: critical: #8 0x800941736 in ??
16-Apr-2020 00:51:34.182 general: critical: exiting (due to assertion failure)

Downgrading to 9.16.1 resulted in the same assertion failure, even if that was
the previously running version. /var/log/bin/named.log from 9.6.1:
16-Apr-2020 00:53:42.055 general: critical: netmgr.c:1000:
REQUIRE(worker->recvbuf_inuse) failed, back trace
16-Apr-2020 00:53:42.055 general: critical: #0 0x2c9d90 in ??
16-Apr-2020 00:53:42.055 general: critical: #1 0x4a707a in ??
16-Apr-2020 00:53:42.055 general: critical: #2 0x4bc819 in ??
16-Apr-2020 00:53:42.055 general: critical: #3 0x4c0a41 in ??
16-Apr-2020 00:53:42.055 general: critical: #4 0x800921c00 in ??
16-Apr-2020 00:53:42.055 general: critical: #5 0x800923dda in ??
16-Apr-2020 00:53:42.055 general: critical: #6 0x800913321 in ??
16-Apr-2020 00:53:42.055 general: critical: #7 0x4bac44 in ??
16-Apr-2020 00:53:42.055 general: critical: #8 0x80093f736 in ??
16-Apr-2020 00:53:42.055 general: critical: exiting (due to assertion failure)

Currently backed up to 9.14.11, whom started just fine.

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