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 29# Demonstrate livelock with "umount -f" seen both with UFS and MSDOS 30 31[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 32 33. ../default.cfg 34 35D=$diskimage 36dd if=/dev/zero of=$D bs=1m count=1k status=none || exit 1 37 38odir=`pwd` 39 40cd /tmp 41sed '1,/^EOF/d' < $odir/$0 > umountf3.c 42mycc -o umountf3 -Wall umountf3.c 43rm -f umountf3.c 44cd $odir 45 46mount | grep "$mntpoint" | grep md$mdstart > /dev/null && umount $mntpoint 47mdconfig -l | grep md$mdstart > /dev/null && mdconfig -d -u $mdstart 48 49mdconfig -a -t vnode -f $D -u $mdstart 50newfs md$mdstart > /dev/null 2>&1 51mount /dev/md$mdstart $mntpoint 52export RUNDIR=$mntpoint/stressX 53for i in `jot 25`; do 54 (cd /$mntpoint; /tmp/umountf3) & 55done 56sleep $((4 * 60)) 57echo "umount -f $mntpoint" 58umount -f $mntpoint 59while pkill umountf3; do :; done 60wait 61mdconfig -d -u $mdstart 62rm -f $D /tmp/umountf3 63exit 64EOF 65 66#include <sys/param.h> 67#include <sys/stat.h> 68#include <err.h> 69#include <fcntl.h> 70#include <stdio.h> 71#include <stdlib.h> 72#include <unistd.h> 73 74static unsigned long size = 1024 * 1024 * 2; 75 76int 77main(int argc, char **argv) 78{ 79 int buf[1024], index, to, n; 80 int fd; 81 char file[128]; 82 83 sprintf(file,"p%06d", getpid()); 84 if ((fd = open(file, O_CREAT | O_RDWR, 0666)) == -1) 85 err(1, "creat(%s)", file); 86 87 to = sizeof(buf); 88 for (;;) { 89 index = 0; 90 while (index < size) { 91 if (index + to > size) 92 to = size - index; 93 index += to; 94 if (write(fd, buf, to) != to) 95 err(1, "write(%s), %s:%d", file, __FILE__, __LINE__); 96 } 97 98 if (lseek(fd, 0, 0) == -1) 99 err(1, "lseek"); 100 index = 0; 101 while (index < size) { 102 if (index + to > size) 103 to = size - index; 104 if ((n = read(fd, buf, to)) != to) 105 err(1, "rw read(%d, %d, %d). %s.%d", n, to, index, __FILE__, __LINE__); 106 index += to; 107 } 108 if (lseek(fd, 0, 0) == -1) 109 err(1, "lseek"); 110 } 111 112 if (close(fd) == -1) 113 err(1, "close(%s), %s:%d", file, __FILE__, __LINE__); 114 if (unlink(file) == -1) 115 err(1, "unlink(%s), %s:%d", file, __FILE__, __LINE__); 116 return (0); 117} 118