mariadbd-multi stop shuts down the wrong server when [client] sets host= or protocol=tcp

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

TMPDIR=/tmp/i6            

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

mkdir -p $TMPDIR

# TCP ports

P2=4401; P3=4402

for n in 2 3; do

  $BASEDIR/scripts/mariadb-install-db --no-defaults --basedir=$BASEDIR --datadir=$TMPDIR/d$n --auth-root-authentication-method=normal >/dev/null

done

cat > $TMPDIR/multi.cnf <<EOF

[mariadbd_multi]

mariadbd=$BASEDIR/bin/mariadbd

mariadb-admin=$BASEDIR/bin/mariadb-admin

user=root

[mysqld2]

datadir=$TMPDIR/d2

socket=$TMPDIR/s2

port=$P2

bind-address=127.0.0.1

pid-file=$TMPDIR/p2

log-error=$TMPDIR/e2.err

[mysqld3]

datadir=$TMPDIR/d3

socket=$TMPDIR/s3

port=$P3

bind-address=127.0.0.1

pid-file=$TMPDIR/p3

log-error=$TMPDIR/e3.err

EOF

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

# Both servers must be running before the test

for n in 2 3; do [ -S $TMPDIR/s$n ] && echo "server $n running" || echo "server $n did NOT start"; done

# Client defaults of the user running mariadbd-multi: port of server 3

printf '[client]\nhost=127.0.0.1\nport=%s\n' $P3 > $TMPDIR/.my.cnf

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

for n in 2 3; do [ -e $TMPDIR/p$n ] && echo "server $n running" || echo "server $n stopped"; done