Index: user/pho/stress2/misc/umountf10.sh
===================================================================
--- user/pho/stress2/misc/umountf10.sh	(nonexistent)
+++ user/pho/stress2/misc/umountf10.sh	(revision 308636)
@@ -0,0 +1,135 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2016 Dell EMC Isilon
+# 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.
+#
+# $FreeBSD$
+#
+
+# Demonstrate deadlock
+# https://people.freebsd.org/~pho/stress/log/umountf10.txt
+
+# Test scenario suggestion by: kib
+# Fixed in r308618.
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+. ../default.cfg
+
+cont=/tmp/umountf10.continue
+dir=/tmp
+odir=`pwd`
+cd $dir
+sed '1,/^EOF/d' < $odir/$0 > $dir/umountf10.c
+mycc -o umountf10 -Wall -Wextra -O2 -g umountf10.c || exit 1
+rm -f umountf10.c
+cd $odir
+
+mount | grep -q "on $mntpoint " && umount -f $mntpoint
+[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart
+
+mdconfig -a -t swap -s 512m -u $mdstart
+gpart create -s GPT md$mdstart > /dev/null || exit 1
+gpart add -t freebsd-ufs md$mdstart > /dev/null || exit 1
+newfs -n $newfs_flags md${mdstart}p1 > /dev/null || exit 1
+mount /dev/md${mdstart}p1 $mntpoint
+touch $mntpoint/marker $cont
+trap "rm -f $cont" EXIT INT
+
+daemon sh -c "(cd $odir/../testcases/swap; ./swap -t 4m -i 20)" > \
+    /dev/null 2>&1
+sleep 5
+
+for i in `jot 4`; do
+	/tmp/umountf10 $mntpoint &
+	pid="$pid $!"
+done
+
+for i in `jot 10`; do
+	while [ -e $cont ]; do procstat -f $pid > /dev/null 2>&1; done &
+	pid2="$pid2 $!"
+done
+
+while [ -e $cont ]; do find $mntpoint -ls > /dev/null 2>&1; done &
+tpid=$!
+
+start=`date '+%s'`
+while [ $((`date '+%s'` - start)) -lt 300 ]; do
+	umount -f $mntpoint 2>/dev/null &&
+	    mount /dev/md${mdstart}p1 $mntpoint
+done
+while pgrep -q swap; do
+	pkill -9 swap
+done
+kill $pid $pid2 $tpid
+wait
+
+umount $mntpoint
+rm -f $mntpoint/file.*
+mdconfig -d -u $mdstart
+
+exit 0
+EOF
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int
+main(int argc, char *argv[])
+{
+	int fd;
+	char file[MAXPATHLEN + 1];
+	char marker[MAXPATHLEN + 1];
+
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s <file path>", argv[0]);
+		exit(1);
+	}
+
+	alarm(600);
+	snprintf(file, sizeof(file), "%s/file.%06d", argv[1], getpid());
+	snprintf(marker, sizeof(marker), "%s/marker", argv[1]);
+	for (;;) {
+		if (access(marker, R_OK) == -1)
+			continue;
+		if ((fd = open(file, O_RDWR | O_CREAT | O_APPEND,
+		    DEFFILEMODE)) == -1) {
+			if (errno != ENOENT && errno != EBUSY)
+				warn("open(%s)", file);
+			continue;
+		}
+		write(fd, "a", 1);
+		usleep(arc4random() % 400);
+		close(fd);
+		unlink(argv[1]);
+	}
+
+	return(0);
+}

Property changes on: user/pho/stress2/misc/umountf10.sh
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+*
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