1#!/bin/sh 2 3# 4# Copyright (c) 2010 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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 30 31# Deadlock seen 32 33. ../default.cfg 34 35here=`pwd` 36cd /tmp 37sed '1,/^EOF/d' < $here/$0 > suj5.c 38mycc -o suj5 -Wall -O2 suj5.c 39rm -f suj5.c 40cd $here 41 42mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint 43mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart 44mdconfig -a -t swap -s 1g -u $mdstart 45newfs -j md$mdstart > /dev/null 46mount /dev/md$mdstart $mntpoint 47chmod 777 $mntpoint 48 49su $testuser -c "cd $mntpoint; /tmp/suj5" > /dev/null 50 51while mount | grep $mntpoint | grep -q /dev/md; do 52 umount $mntpoint || sleep 1 53done 54mdconfig -d -u $mdstart 55rm -f /tmp/suj5 56exit 57EOF 58#include <sys/param.h> 59#include <sys/mount.h> 60#include <sys/stat.h> 61#include <sys/wait.h> 62#include <err.h> 63#include <fcntl.h> 64#include <stdio.h> 65#include <stdlib.h> 66#include <unistd.h> 67 68#define PARALLEL 10 69 70static int 71random_int(int mi, int ma) 72{ 73 return (arc4random() % (ma - mi + 1) + mi); 74} 75 76static int64_t 77df(void) 78{ 79 char path[MAXPATHLEN+1]; 80 struct statfs buf; 81 82 if (getcwd(path, sizeof(path)) == NULL) 83 err(1, "getcwd()"); 84 85 if (statfs(path, &buf) < 0) 86 err(1, "statfs(%s)", path); 87 printf("Free space on %s: %jd Mb\n", path, buf.f_bavail * buf.f_bsize / 1024 / 1024); 88 return (buf.f_bavail * buf.f_bsize); 89} 90 91static void 92test(int size) 93{ 94 int buf[1024], index, to; 95#ifdef TEST 96 int i; 97#endif 98 int fd; 99 char file[128]; 100 101 sprintf(file,"p%05d", getpid()); 102 if ((fd = creat(file, 0660)) == -1) 103 err(1, "creat(%s)", file); 104 105 to = sizeof(buf); 106 index = 0; 107 while (index < size) { 108 if (index + to > size) 109 to = size - index; 110#ifdef TEST 111 for (i = 0; i < to; i++) 112 buf[i] = index + i; 113#endif 114 index += to; 115 if (write(fd, buf, to) != to) 116 err(1, "write(%s), %s:%d", file, __FILE__, __LINE__); 117 } 118 if (close(fd) == -1) 119 err(1, "close(%s), %s:%d", file, __FILE__, __LINE__); 120 121 if ((fd = open(file, O_RDONLY)) == -1) 122 err(1, "open(%s), %s:%d", file, __FILE__, __LINE__); 123 124 index = 0; 125 while (index < size) { 126 if (index + to > size) 127 to = size - index; 128 if (read(fd, buf, to) != to) 129 err(1, "rw read. %s.%d", __FILE__, __LINE__); 130#ifdef TEST 131 for (i = 0; i < to; i++) { 132 if (buf[i] != index + i) { 133 fprintf(stderr, 134 "%s, pid %d: expected %d @ %d, got %d\n", 135 getprogname(), getpid(), index+i, index+i, 136 buf[i]); 137 exit(EXIT_FAILURE); 138 } 139 } 140#endif 141 index += to; 142 } 143 if (close(fd) == -1) 144 err(1, "close(%s), %s:%d", file, __FILE__, __LINE__); 145 if (unlink(file) == -1) 146 err(1, "unlink(%s), %s:%d", file, __FILE__, __LINE__); 147 exit(0); 148} 149 150int 151main() 152{ 153 int i, j, pct; 154 int size; /* in k */ 155 int64_t bl; 156 157 bl = df(); 158 if (bl > (int64_t)INT_MAX * PARALLEL) 159 bl = (int64_t)INT_MAX * PARALLEL; 160 size = bl / PARALLEL / 1024; 161 162 pct = random_int(1, 50); 163 size = size / 100 * pct + 1; 164 if (random_int(1, 100) <= 50) 165 size = 34 * 1024; /* Known good deadlock value */ 166 printf("Max file size: %d Mb\n", size / 1024); 167 168 for (i = 0; i < 100; i++) { 169 for (j = 0; j < PARALLEL; j++) { 170 if (fork() == 0) { 171 test(random_int(1, size) * 1024); 172 } 173 } 174 for (j = 0; j < PARALLEL; j++) 175 wait(NULL); 176 } 177 178 return (0); 179} 180