1#!/bin/sh 2 3# 4# Copyright (c) 2008 Peter Holm <pho@FreeBSD.org> 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28# $FreeBSD$ 29# 30 31# Demonstrate livelock with "umount -f" seen both with UFS and MSDOS 32 33[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 34 35. ../default.cfg 36 37D=$diskimage 38dede $D 1m 1k || exit 1 39 40odir=`pwd` 41 42cd /tmp 43sed '1,/^EOF/d' < $odir/$0 > umountf3.c 44cc -o umountf3 -Wall umountf3.c 45rm -f umountf3.c 46cd $odir 47 48 49mount | grep "$mntpoint" | grep md${mdstart} > /dev/null && umount $mntpoint 50mdconfig -l | grep md${mdstart} > /dev/null && mdconfig -d -u ${mdstart} 51 52mdconfig -a -t vnode -f $D -u ${mdstart} 53bsdlabel -w md${mdstart} auto 54newfs md${mdstart}${part} > /dev/null 2>&1 55mount /dev/md${mdstart}${part} $mntpoint 56#newfs_msdos -F 32 -b 8192 /dev/md${mdstart}a 57#mount -t msdosfs /dev/md${mdstart}a $mntpoint 58export RUNDIR=$mntpoint/stressX 59for i in `jot 25`; do 60 (cd /$mntpoint; /tmp/umountf3) & 61done 62sleep $((4 * 60)) 63echo "umount -f $mntpoint" 64umount -f $mntpoint 65mdconfig -d -u $mdstart 66rm -f $D /tmp/umountf3 67exit 68EOF 69 70#include <stdio.h> 71#include <stdlib.h> 72#include <unistd.h> 73#include <fcntl.h> 74#include <sys/stat.h> 75#include <sys/param.h> 76#include <err.h> 77 78static unsigned long size = 1024 * 1024 * 2; 79 80int 81main(int argc, char **argv) 82{ 83 int buf[1024], index, to, n; 84 int fd; 85 char file[128]; 86 87 88 sprintf(file,"p%06d", getpid()); 89 if ((fd = open(file, O_CREAT | O_RDWR, 0666)) == -1) 90 err(1, "creat(%s)", file); 91 92 to = sizeof(buf); 93 for (;;) { 94 index = 0; 95 while (index < size) { 96 if (index + to > size) 97 to = size - index; 98 index += to; 99 if (write(fd, buf, to) != to) 100 err(1, "write(%s), %s:%d", file, __FILE__, __LINE__); 101 } 102 103 if (lseek(fd, 0, 0) == -1) 104 err(1, "lseek"); 105 index = 0; 106 while (index < size) { 107 if (index + to > size) 108 to = size - index; 109 if ((n = read(fd, buf, to)) != to) 110 err(1, "rw read(%d, %d, %d). %s.%d", n, to, index, __FILE__, __LINE__); 111 index += to; 112 } 113 if (lseek(fd, 0, 0) == -1) 114 err(1, "lseek"); 115 } 116 117 if (close(fd) == -1) 118 err(1, "close(%s), %s:%d", file, __FILE__, __LINE__); 119 if (unlink(file) == -1) 120 err(1, "unlink(%s), %s:%d", file, __FILE__, __LINE__); 121 return (0); 122} 123