pfSense

When IP addresses exist on the system that ntpd cannot bind to it can fail to start and core dump.

For example an IPv6 address that is marked as duplicated:

vtnet1: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
    description: LAN
    options=800b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,LINKSTATE>
    ether 76:2c:71:97:db:70
    inet 192.168.167.1 netmask 0xffffff00 broadcast 192.168.167.255
    inet6 fe80::742c:71ff:fe97:db70%vtnet1 prefixlen 64 scopeid 0x2
    inet6 fe80::1:1%vtnet1 prefixlen 64 duplicated scopeid 0x2
    media: Ethernet autoselect (10Gbase-T <full-duplex>)
    status: active

Results in:

Nov 1 18:49:55     ntpd     7513     ntpd 4.2.8p18@1.4062-o Wed May 29 07:23:37 UTC 2024 (1): Starting
Nov 1 18:49:55     ntpd     7513     Command line: /usr/local/sbin/ntpd -g -c /var/etc/ntpd.conf -p /var/run/ntpd.pid
Nov 1 18:49:55     ntpd     7513     ----------------------------------------------------
Nov 1 18:49:55     ntpd     7513     ntp-4 is maintained by Network Time Foundation,
Nov 1 18:49:55     ntpd     7513     Inc. (NTF), a non-profit 501(c)(3) public-benefit
Nov 1 18:49:55     ntpd     7513     corporation. Support and training for ntp-4 are
Nov 1 18:49:55     ntpd     7513     available at https://www.nwtime.org/support
Nov 1 18:49:55     ntpd     7513     ----------------------------------------------------
Nov 1 18:49:55     ntpd     7596     proto: precision = 0.055 usec (-24)
Nov 1 18:49:55     ntpd     7596     basedate set to 2024-05-17
Nov 1 18:49:55     ntpd     7596     gps base set to 2024-05-19 (week 2315)
Nov 1 18:49:55     ntpd     7596     initial drift restored to 44.469025
Nov 1 18:49:55     ntpd     7596     Listen and drop on 0 v6wildcard [::]:123
Nov 1 18:49:55     ntpd     7596     Listen and drop on 1 v4wildcard 0.0.0.0:123
Nov 1 18:49:55     ntpd     7596     Listen normally on 2 vtnet0 [fe80::18f0:2cff:fe1a:20ae%1]:123
Nov 1 18:49:55     ntpd     7596     Listen normally on 3 vtnet0 172.21.16.26:123
Nov 1 18:49:55     ntpd     7596     Listen normally on 4 vtnet1 [fe80::742c:71ff:fe97:db70%2]:123
Nov 1 18:49:55     ntpd     7596     Listen normally on 5 vtnet1 192.168.167.1:123
Nov 1 18:49:55     ntpd     7596     bind(26) AF_INET6 [fe80::1:1%2]:123 flags 0x811 failed: Can't assign requested address
Nov 1 18:49:55     ntpd     7596     unable to create socket on vtnet1 (6) for [fe80::1:1%2]:123
Nov 1 18:49:55     ntpd     7513     daemon child died with signal 11 

Nov 1 18:49:55     php-fpm     55722     /status_services.php: The command '/usr/local/sbin/ntpd -g -c /var/etc/ntpd.conf -p /var/run/ntpd.pid' returned exit code '70', the output was 'daemon control: got EOF'
Nov 1 18:49:55     php-fpm     55722     /status_services.php: NTPD is starting up.
Nov 1 18:49:56     kernel         pid 7596 (ntpd), jid 0, uid 0: exited on signal 11 (core dumped) 

This is a regression since ntpd 4.2.8p17 in 24.03