stress2: Added a regression test

tools/test/stress2/misc/nullfs30.sh

@@ -0,0 +1,112 @@
+#!/bin/sh
+
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2023 Peter Holm <pho@FreeBSD.org>
+#
+# 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.
+#
+
+# Parallel mount and umount test of file mounts,
+# mounting over non-directories
+
+# panic: free: address 0xffffffff80b229b4 ... has not been allocated
+# https://people.freebsd.org/~pho/stress/log/log0454.txt
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+. ../default.cfg
+
+cont=/tmp/nullfs30.continue
+mounts=3	# Number of parallel scripts
+
+set -eu
+md1=$mdstart
+md2=$((md1 + 1))
+mp1=$mntpoint$md1
+mp2=$mntpoint$md2
+mkdir -p $mp1 $mp2
+
+mdconfig -a -t swap -s 256m -u $md1
+newfs $newfs_flags -n md$md1 > /dev/null
+mount /dev/md$md1 $mp1
+mdconfig -a -t swap -s 256m -u $md2
+newfs $newfs_flags -n md$md2 > /dev/null
+mount /dev/md$md2 $mp2
+
+for i in `jot $mounts`; do
+	cp /etc/group $mp1/f$i
+	touch $mp2/m$i
+done
+set +e
+
+mount -t nullfs $mp1/f1 $mp2/m1 || {
+    umount $mp2
+    umount $mp1
+    mdconfig -d -u $md2
+    mdconfig -d -u $md1
+    echo "File mount not implemented"
+    exit 0
+}
+
+(cd ../testcases/swap; ./swap -t 5m -i 20 > /dev/null) &
+
+# Start the parallel tests
+touch $cont
+while [ -f $cont ]; do
+	while mount | grep -q "on $mp2/m1 "; do umount $mp2/m1; done 2> /dev/null
+	mount -t nullfs $mp1/f1 $mp2/m1
+done &
+while [ -f $cont ]; do
+	while mount | grep -q "on $mp2/m2 "; do umount $mp2/m2; done 2> /dev/null
+	mount -t nullfs $mp1/f2 $mp2/m2
+done &
+while [ -f $cont ]; do
+	while mount | grep -q "on $mp2/m3 "; do umount $mp2/m3; done 2> /dev/null
+	mount -t nullfs $mp1/f3 $mp2/m3
+done &
+
+start=`date +%s`
+while [ $((`date +%s` - start)) -lt 300 ]; do
+	cat $mp2/m1 $mp2/m2 $mp2/m3 > /dev/null
+done
+rm -f $cont
+while pgrep -q swap; do pkill swap; done
+wait
+
+for i in 1 2 3; do
+	while mount | grep -q "on $mp2/m$i "; do umount $mp2/m$i; done 2> /dev/null
+done
+
+# Check error handling
+mount -t nullfs $mp1/f1 $mp2/m1
+mount -t nullfs $mp1/f1 $mp2/m1 2>/dev/null && s=1 || s=0
+while mount | grep -q "on $mp2/m1 "; do umount $mp2/m1; done 2> /dev/null
+
+mkdir $mp2/dir
+mount -t nullfs $mp1/f1 $mp2/dir 2>/dev/null && s=2
+
+umount $mp2
+umount $mp1
+mdconfig -d -u $md2
+mdconfig -d -u $md1
+exit $s