[Bug 237649] Does not work receiving an IP address via DHCP after stable/12 (r346874-r347140)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237649

John W. O'Brien <john at saltant.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |john at saltant.com

--- Comment #10 from John W. O'Brien <john at saltant.com> ---
I believe I can reproduce this on 12.1-RELEASE in a VNET jail.

>From /etc/jail.conf (host)
====
dhcptest1 {
    path = "/usr/jail/dhcptest1";
    host.hostname = "dhcptest1.net.isc.upenn.edu";
    vnet;
    vnet.interface = dhcp1;
    allow.raw_sockets;
    mount.fdescfs;
    devfs_ruleset = 40;
}
====

/etc/devfs.rules (host)
====
[devfsrules_jail_bpf=40]
add include $devfsrules_hide_all
add include $devfsrules_unhide_basic
add include $devfsrules_unhide_login
add path zfs unhide
add path 'bpf*' unhide
own  bpf* root:network
perm bpf* 0660
====

/etc/rc.conf (jail)
====
firewall_enable="YES"
firewall_type="open"
ifconfig_dhcp1="DHCP"
====

The relevant lines from /etc/network.subr toward the end of ifconfig_up() are:

====
        if dhcpif $1; then
                if [ $_cfg -ne 0 ] ; then
                        ${IFCONFIG_CMD} $1 up
                fi
                if syncdhcpif $1; then
                        /etc/rc.d/dhclient start $1
                fi
                _cfg=0
        fi
====

This is the only place anywhere in /etc containing "dhclient start", and it
only runs if the iface is set to "SYNCDHCP" or if synchronous_dhclient=YES.

I cannot figure out how this ever worked as documented in the rc.conf manpage,
but I did find a clue in base r157706: "Allow the administrator to specify if
dhclient should be started when /etc/rc.d/netif configures the interface or
only by devd." That suggests to me that devd is a requirement for async DHCP,
but I have not yet found what other configuration is required, nor what might
have changed to trigger a latent bug.

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