Fix memory leak when a child exits without wait()-ed

Change-Id: I8ad9e20e3f3e6f406548a6c4de2bf4dc07c40b0e
Refs: #1349

test/issues/1349/run.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# run.sh COPYRIGHT FUJITSU LIMITED 2020
+test_dir=$(dirname "${BASH_SOURCE[0]}")
+. "${test_dir}/../../common.sh"
+
+# init
+meminfo="/sys/devices/virtual/mcos/mcos0/sys/devices/system/node/node0/meminfo"
+"${MCEXEC}" 0 ./do_fork6 -nt 1 -t $((1000 * 10)) -mode-wait
+sleep 1
+exp_free_mem=`cat "$meminfo" | grep MemFree:`
+
+# run
+"${MCEXEC}" 0 ./do_fork6 -nt 1 -t $((1000 * 10)) -mode-wait
+sleep 1
+free_mem=`cat "$meminfo" | grep MemFree:`
+if [ "$exp_free_mem" != "$free_mem" ]; then
+	echo "NG: detected memory leak."
+	exit -1
+fi
+
+"${MCEXEC}" 0 ./do_fork6 -nt 1 -t $((1000 * 10)) -mode-exit
+sleep 1
+free_mem=`cat "$meminfo" | grep MemFree:`
+if [ "$exp_free_mem" != "$free_mem" ]; then
+	echo "NG: detected memory leak."
+	exit -1
+fi
+
+echo "OK"