mariadbd-multi cannot report or stop a server whose group has an empty socket= and a port=

BASEDIR=/test/mtest/MDEV-42003/MD031126-mariadb-13.2.0-linux-x86_64-opt

TMPDIR=/tmp/testdir

export HOME=$TMPDIR PATH=$BASEDIR/bin:$PATH

unset MYSQL_HOME MARIADB_HOME

mkdir -p $TMPDIR/itmp

$BASEDIR/scripts/mariadb-install-db --no-defaults --basedir=$BASEDIR --datadir=$TMPDIR/d2 --tmpdir=$TMPDIR/itmp --auth-root-authentication-method=normal >/dev/null 2>&1

cat > $TMPDIR/multi.cnf <<EOC

[mysqld_multi]

mysqld=$BASEDIR/bin/mariadbd

mysqladmin=$BASEDIR/bin/mariadb-admin

user=root

[mysqld2]

datadir=$TMPDIR/d2

socket=

port=13307

bind-address=127.0.0.1

pid-file=$TMPDIR/p2

log-error=$TMPDIR/e2.err

EOC

mariadbd-multi --defaults-file=$TMPDIR/multi.cnf --no-log --silent start 2; sleep 5

mariadb --no-defaults -uroot -h127.0.0.1 -P13307 -BNe 'SELECT @@socket, @@port' 2>/dev/null

mariadbd-multi --defaults-file=$TMPDIR/multi.cnf --no-log --silent report 2

mariadbd-multi --defaults-file=$TMPDIR/multi.cnf --no-log --silent --tcp-ip report 2

mariadbd-multi --defaults-file=$TMPDIR/multi.cnf --no-log --silent stop 2; sleep 5

[ -e $TMPDIR/p2 ] && echo "server 2 running" || echo "server 2 stopped"

# Cleanup

mariadb-admin --no-defaults -uroot -h127.0.0.1 -P13307 shutdown >/dev/null 2>&1; sleep 3; 

rm -rf $TMPDIR

mariadbd-multi log file version 3.0; run: Tue Nov 10 10:34:34 2026

Starting MariaDB servers

	13307

mariadbd-multi log file version 3.0; run: Tue Nov 10 10:34:39 2026

Reporting MariaDB servers

MariaDB server from group: mysqld2 is not running

mariadbd-multi log file version 3.0; run: Tue Nov 10 10:34:39 2026

Reporting MariaDB servers

MariaDB server from group: mysqld2 is running

mariadbd-multi log file version 3.0; run: Tue Nov 10 10:34:39 2026

Stopping MariaDB servers

/test/mtest/MDEV-42003/MD031126-mariadb-13.2.0-linux-x86_64-opt/bin/mariadb-admin: connect to server at 'localhost' failed

error: 'Can't connect to local server through socket '' (111)'

Check that mariadbd is running and that the socket: '' exists!

server 2 running

mariadbd-multi log file version 3.0; run: Tue Nov 10 10:51:23 2026

Starting MariaDB servers

	13307

mariadbd-multi log file version 3.0; run: Tue Nov 10 10:51:28 2026

Reporting MariaDB servers

MariaDB server from group: mysqld2 is running

mariadbd-multi log file version 3.0; run: Tue Nov 10 10:51:28 2026

Reporting MariaDB servers

MariaDB server from group: mysqld2 is running

mariadbd-multi log file version 3.0; run: Tue Nov 10 10:51:28 2026

Stopping MariaDB servers

WARNING: option --ssl-verify-server-cert is disabled, because of an insecure passwordless login.

server 2 stopped