[Bug 264908] It does not work to obtain an IP address via DHCP simultaneously for multiple interfaces

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264908

            Bug ID: 264908
           Summary: It does not work to obtain an IP address via DHCP
                    simultaneously for multiple interfaces
           Product: Base System
           Version: 12.3-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: admin@support.od.ua
                CC: net@FreeBSD.org

Given physical server in KimSufi (OVH):
Atom(TM) CPU N2800 @ 1.86GHz, 2 core/4 threads, RAM 4GB, one 2TB HDD, 100Mb
network interface (em0)

# uname -a
FreeBSD tank2.storage 12.3-STABLE FreeBSD 12.3-STABLE #0 r372168M: Sat Jun 25
20:34:53 EEST 2022

# uname -KU
1203507 1203507

# ifconfig -l
em0 enc0 lo0 pflog0 pfsync0 ygg0

# sysrc -a | grep -E 'ygg|_em0|DHCP|NOAUTO'
ifconfig_DEFAULT: SYNCDHCP
ifconfig_em0: DHCP
ifconfig_em0_alias0: inet6 2001:XXXX:Y:YYYY::2
ifconfig_em0_ipv6: inet6 2001:XXXX:YYYY:XXXX::1/56
yggdrasil_enable: YES

# grep -v ^# /etc/dhclient.conf

In logs after system start:
...
Jun 26 12:12:05 tank2 kernel: Starting devd.
Jun 26 12:12:05 tank2 kernel: Starting dhclient.
Jun 26 12:12:05 tank2 kernel: ifconfig: ioctl (SIOCAIFADDR): File exists
Jun 26 12:12:05 tank2 kernel: em0: not found
Jun 26 12:12:05 tank2 kernel: exiting.
Jun 26 12:12:05 tank2 kernel: /etc/rc.d/dhclient: WARNING: failed to start
dhclient
...
Jun 26 12:12:12 tank2 ntpd[6966]: Soliciting pool server 149.202.91.39
...
Jun 26 15:12:18 tank2 dhclient[65385]: DHCPDISCOVER on ygg0 to 255.255.255.255
port 67 interval 3
...
Jun 26 15:12:21 tank2 dhclient[65385]: DHCPDISCOVER on ygg0 to 255.255.255.255
port 67 interval 4
...
Jun 26 15:18:19 tank2 dhclient[65385]: DHCPDISCOVER on ygg0 to 255.255.255.255
port 67 interval 5
Jun 26 15:18:24 tank2 dhclient[65385]: DHCPDISCOVER on ygg0 to 255.255.255.255
port 67 interval 10
Jun 26 15:18:34 tank2 dhclient[65385]: DHCPDISCOVER on ygg0 to 255.255.255.255
port 67 interval 11
Jun 26 15:18:45 tank2 dhclient[65385]: DHCPDISCOVER on ygg0 to 255.255.255.255
port 67 interval 12
Jun 26 15:18:47 tank2 ntpd[6966]: Soliciting pool server 162.159.200.123
Jun 26 15:18:57 tank2 dhclient[65385]: DHCPDISCOVER on ygg0 to 255.255.255.255
port 67 interval 14
Jun 26 15:19:11 tank2 dhclient[65385]: DHCPDISCOVER on ygg0 to 255.255.255.255
port 67 interval 9
Jun 26 15:19:20 tank2 dhclient[65385]: No DHCPOFFERS received.
Jun 26 15:19:20 tank2 dhclient[65385]: No working leases in persistent database
- sleeping.
...

The NTP server on v6 gets the right time, so the time stamp jumped to 3 hours


I try to manually get network settings via DHCP:
# dhclient enc0
ifconfig: ioctl (SIOCAIFADDR): Invalid argument
enc0: not found
exiting.

# dhclient em0
ifconfig: ioctl (SIOCAIFADDR): File exists
em0: not found
exiting.

Network settings haven't changed since 12.2-STABLE.


As a solution to the problem, adding lines to rc.conf and reboot helps:
ifconfig_enc0="NOAUTO"
ifconfig_ygg0="NOAUTO"


How to reproduce the issue.

Create a FreeBSD 12.3-STABLE (virtual) machine with more than one network
interface that receives network settings.
Add lines to rc.conf config:
ifconfig_DEFAULT="SYNCDHCP"
ifconfig_em0="DHCP"

Reboot machine.

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