diff --git a/tools/test/stress2/misc/unionfs.sh b/tools/test/stress2/misc/unionfs.sh
index dbf3ba0fbc2e..6e04e809b501 100755
--- a/tools/test/stress2/misc/unionfs.sh
+++ b/tools/test/stress2/misc/unionfs.sh
@@ -1,52 +1,54 @@
 #!/bin/sh
 
 #
 # Copyright (c) 2008-2011 Peter Holm <pho@FreeBSD.org>
 # 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.
 #
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
 # "insmntque: non-locked vp: 0xd2462e10 is not exclusive locked ..." seen.
 
 . ../default.cfg
 
 truncate -s 256M $diskimage
 
 mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint
 mdconfig -l | grep -q md$mdstart &&  mdconfig -d -u $mdstart
 
 mdconfig -a -t vnode -f $diskimage -u $mdstart
 bsdlabel -w md$mdstart auto
 newfs $newfs_flags md${mdstart}$part > /dev/null
 mount /dev/md${mdstart}$part $mntpoint
 mount -t unionfs -o noatime $mntpoint /tmp
 export RUNDIR=/tmp/stressX
 export runRUNTIME=10m            # Run tests for 10 minutes
 (cd ..; ./run.sh disk.cfg)
+umount /tmp
 while mount | grep $mntpoint | grep -q /dev/md; do
 	umount $mntpoint || sleep 1
 done
 mdconfig -d -u $mdstart
 rm -f $diskimage
+exit 0