diff --git a/tools/test/stress2/misc/newfs6.sh b/tools/test/stress2/misc/newfs6.sh
index 5e887f1496a6..690170ceb938 100755
--- a/tools/test/stress2/misc/newfs6.sh
+++ b/tools/test/stress2/misc/newfs6.sh
@@ -1,57 +1,64 @@
 #!/bin/sh
 
 #
 # SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 #
 # Copyright (c) 2022 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.
 #
 
 # A fast version of newfs.sh
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
 . ../default.cfg
 
 mount | grep "on $mntpoint " | grep -q md$mdstart &&
     umount $mntpoint
 mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart
 mdconfig -a -t swap -s 1g -u $mdstart || exit 1
 
+log=/tmp/newfs6.sh.log
 s=0
 for opt in -O1 -O2 -U -j; do
 	bs=4096
 	while [ $bs -le 65536 ]; do
 		for i in 8 4 2 1; do
 			fragsize=$((bs / i))
 			echo "newfs $opt -b $bs -f $fragsize md$mdstart "
 			newfs $opt -b $bs -f $fragsize \
 			    md$mdstart > /dev/null || { s=1; continue; }
 			mount /dev/md$mdstart $mntpoint || s=2 &&
 			    umount $mntpoint
+			fsck -fy /dev/md$mdstart > $log 2>&1
+			grep -q "WAS MODIFIED" $log && {
+				s=3
+				cat $log
+			}
 		done
 		bs=$((bs * 2))
 	done
 done
 mdconfig -d -u $mdstart
+rm -f $log
 exit $s