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#!/bin/sh
#
# Copyright (c) 2014 EMC Corp.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Test vm.overcommit. Variation of overcommit.sh
# Use a swap backed MD disk with the size of 1.2 * hw.usermem.
# Deadlock seen: https://people.freebsd.org/~pho/stress/log/alan007.txt
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
[ `swapinfo | wc -l` -eq 1 ] && exit 0
. ../default.cfg
old=`sysctl -n vm.overcommit`
[ $old -eq 1 ] && exit
size=$((`sysctl -n hw.usermem` / 1024 / 1024)) # in MB
size=$((size + size / 100 * 20)) # 120% of hw.usermem
sysctl vm.overcommit=1
trap "sysctl vm.overcommit=$old" EXIT INT
mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint
mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart
mdconfig -a -t swap -s ${size}m -u $mdstart
newfs $newfs_flags md$mdstart > /dev/null
mount /dev/md$mdstart $mntpoint
echo "Expect:
/mnt: write failed, filesystem is full
dd: /mnt/big.1: No space left on device"
for i in `jot 10`; do
dd if=/dev/zero of=$mntpoint/big.$i bs=1m status=none
done
wait
while mount | grep "on $mntpoint " | grep -q /dev/md; do
umount $mntpoint || sleep 1
done
mdconfig -d -u $mdstart
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