Index: user/pho/stress2/misc/snap4.sh
===================================================================
--- user/pho/stress2/misc/snap4.sh	(revision 357721)
+++ user/pho/stress2/misc/snap4.sh	(revision 357722)
@@ -1,56 +1,59 @@
 #!/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.
 #
 # $FreeBSD$
 #
 
 [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
 
-# Test with snapshot file unlinked before unmount
+# Test with snapshot file unlinked before unmount.
 
+# "panic: snapacct_ufs2: bad block" seen:
+# https://people.freebsd.org/~pho/stress/log/snap4.txt
+
 . ../default.cfg
 
 mount | grep -q "on /tmp (ufs," || exit 0
 mount | grep -q "/dev/md$mdstart on $mntpoint" && umount $mntpoint
 mdconfig -l | grep -q md$mdstart &&  mdconfig -d -u $mdstart
 rm -f /tmp/.snap/stress2
 trap "rm -f /tmp/.snap/stress2" 0
 
 start=`date '+%s'`
-while [ `date '+%s'` -lt $((start + 1800)) ]; do
+while [ `date '+%s'` -lt $((start + 1200)) ]; do
    mksnap_ffs /tmp /tmp/.snap/stress2
    mdconfig -a -t vnode -f /tmp/.snap/stress2 -u $mdstart -o readonly
    mount -o ro /dev/md$mdstart $mntpoint
 
    ls -l $mntpoint > /dev/null
    rm -f /tmp/.snap/stress2
    sleep 1
 
    umount $mntpoint
    mdconfig -d -u $mdstart
    rm -f /tmp/.snap/stress2
 done