[Bug 280057] net/frr9: mgmtd aborts during config check on assertion in lib/vty.c:vty_new()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280057

            Bug ID: 280057
           Summary: net/frr9: mgmtd aborts during config check on
                    assertion in lib/vty.c:vty_new()
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: olivier@freebsd.org
          Reporter: john@saltant.com
             Flags: maintainer-feedback?(olivier@freebsd.org)
          Assignee: olivier@freebsd.org

Created attachment 251784
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=251784&action=edit
Terminal output from "service frr start"

On a clean install of net/frr9 with empty config files, the mgmtd service
component fails to start. During the config check step, it aborts with these
errors followed by additional diagnostic output (see attached).


MGMTD: [YKHB9-ND03T] FE-client: msg_conn_send_msg: can't send message on closed
connection
MGMTD: lib/vty.c:1684: vty_new(): assertion (new->mgmt_session_id != 0) failed,
extra info: Failed to create client session for VTY
MGMTD: Received signal 6 at 1719706531 (si_addr 0x0); aborting...


Steps to reproduce:

    pkg install frr9
    sysrc frr_enable=YES frr_daemons="zebra mgmtd staticd"
    mkdir /usr/local/etc/frr
    cd /usr/local/etc/frr
    umask 066
    touch zebra.conf mgmtd.conf staticd.conf
    chown -R frr:frr /usr/local/etc/frr
    service frr start

Confirmed on freshly deployed EC2 instances running 13.3-RELEASE (amd64 and
arm64) and 14.1-RELEASE (amd64 and arm64).

The symptoms are similar to those reported in
https://github.com/FRRouting/frr/issues/14174, except that the current version
of devel/protobuf-c (1.4.1) is greater than the version that resolved that
issue (1.3.3).

Editing frr's rc script to skip the config check for mgmtd enables the service
to start successfully.

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