1#!/bin/sh 2 3# 4# Copyright (c) 2016 Dell EMC Isilon 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 deadlock 30# https://people.freebsd.org/~pho/stress/log/umountf10.txt 31 32# Test scenario suggestion by: kib 33# Fixed in r308618. 34 35[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 36. ../default.cfg 37 38cont=/tmp/umountf10.continue 39dir=/tmp 40odir=`pwd` 41cd $dir 42sed '1,/^EOF/d' < $odir/$0 > $dir/umountf10.c 43mycc -o umountf10 -Wall -Wextra -O2 -g umountf10.c || exit 1 44rm -f umountf10.c 45cd $odir 46 47mount | grep -q "on $mntpoint " && umount -f $mntpoint 48[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart 49 50mdconfig -a -t swap -s 512m -u $mdstart 51gpart create -s GPT md$mdstart > /dev/null || exit 1 52gpart add -t freebsd-ufs md$mdstart > /dev/null || exit 1 53newfs -n $newfs_flags md${mdstart}p1 > /dev/null || exit 1 54mount /dev/md${mdstart}p1 $mntpoint 55touch $mntpoint/marker $cont 56trap "rm -f $cont" EXIT INT 57 58daemon sh -c "(cd $odir/../testcases/swap; ./swap -t 4m -i 20)" > \ 59 /dev/null 2>&1 60sleep 5 61 62for i in `jot 4`; do 63 /tmp/umountf10 $mntpoint & 64 pid="$pid $!" 65done 66 67for i in `jot 10`; do 68 while [ -e $cont ]; do procstat -f $pid > /dev/null 2>&1; done & 69 pid2="$pid2 $!" 70done 71 72while [ -e $cont ]; do find $mntpoint -ls > /dev/null 2>&1; done & 73tpid=$! 74 75start=`date '+%s'` 76while [ $((`date '+%s'` - start)) -lt 300 ]; do 77 umount -f $mntpoint 2>/dev/null && 78 mount /dev/md${mdstart}p1 $mntpoint 79done 80while pgrep -q swap; do 81 pkill -9 swap 82done 83kill $pid $pid2 $tpid 84wait 85 86umount $mntpoint 87rm -f $mntpoint/file.* /tmp/umountf10 88mdconfig -d -u $mdstart 89 90exit 0 91EOF 92#include <sys/param.h> 93#include <sys/stat.h> 94 95#include <err.h> 96#include <errno.h> 97#include <fcntl.h> 98#include <stdio.h> 99#include <stdlib.h> 100#include <unistd.h> 101 102int 103main(int argc, char *argv[]) 104{ 105 int fd; 106 char file[MAXPATHLEN + 1]; 107 char marker[MAXPATHLEN + 1]; 108 109 if (argc != 2) { 110 fprintf(stderr, "Usage: %s <file path>", argv[0]); 111 exit(1); 112 } 113 114 alarm(600); 115 snprintf(file, sizeof(file), "%s/file.%06d", argv[1], getpid()); 116 snprintf(marker, sizeof(marker), "%s/marker", argv[1]); 117 for (;;) { 118 if (access(marker, R_OK) == -1) 119 continue; 120 if ((fd = open(file, O_RDWR | O_CREAT | O_APPEND, 121 DEFFILEMODE)) == -1) { 122 if (errno != ENOENT && errno != EBUSY) 123 warn("open(%s)", file); 124 continue; 125 } 126 write(fd, "a", 1); 127 usleep(arc4random() % 400); 128 close(fd); 129 unlink(argv[1]); 130 } 131 132 return(0); 133} 134