134 lines
3.5 KiB
Bash
Executable File
134 lines
3.5 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2016 Dell EMC Isilon
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# Demonstrate deadlock
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# https://people.freebsd.org/~pho/stress/log/umountf10.txt
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# Test scenario suggestion by: kib
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# Fixed in r308618.
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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
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. ../default.cfg
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cont=/tmp/umountf10.continue
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dir=/tmp
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odir=`pwd`
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cd $dir
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sed '1,/^EOF/d' < $odir/$0 > $dir/umountf10.c
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mycc -o umountf10 -Wall -Wextra -O2 -g umountf10.c || exit 1
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rm -f umountf10.c
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cd $odir
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mount | grep -q "on $mntpoint " && umount -f $mntpoint
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[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart
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mdconfig -a -t swap -s 512m -u $mdstart
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gpart create -s GPT md$mdstart > /dev/null || exit 1
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gpart add -t freebsd-ufs md$mdstart > /dev/null || exit 1
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newfs -n $newfs_flags md${mdstart}p1 > /dev/null || exit 1
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mount /dev/md${mdstart}p1 $mntpoint
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touch $mntpoint/marker $cont
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trap "rm -f $cont" EXIT INT
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daemon sh -c "(cd $odir/../testcases/swap; ./swap -t 4m -i 20)" > \
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/dev/null 2>&1
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sleep 5
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for i in `jot 4`; do
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/tmp/umountf10 $mntpoint &
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pid="$pid $!"
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done
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for i in `jot 10`; do
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while [ -e $cont ]; do procstat -f $pid > /dev/null 2>&1; done &
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pid2="$pid2 $!"
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done
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while [ -e $cont ]; do find $mntpoint -ls > /dev/null 2>&1; done &
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tpid=$!
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start=`date '+%s'`
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while [ $((`date '+%s'` - start)) -lt 300 ]; do
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umount -f $mntpoint 2>/dev/null &&
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mount /dev/md${mdstart}p1 $mntpoint
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done
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while pgrep -q swap; do
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pkill -9 swap
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done
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kill $pid $pid2 $tpid
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wait
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umount $mntpoint
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rm -f $mntpoint/file.* /tmp/umountf10
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mdconfig -d -u $mdstart
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exit 0
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EOF
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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int
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main(int argc, char *argv[])
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{
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int fd;
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char file[MAXPATHLEN + 1];
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char marker[MAXPATHLEN + 1];
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <file path>", argv[0]);
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exit(1);
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}
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alarm(600);
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snprintf(file, sizeof(file), "%s/file.%06d", argv[1], getpid());
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snprintf(marker, sizeof(marker), "%s/marker", argv[1]);
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for (;;) {
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if (access(marker, R_OK) == -1)
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continue;
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if ((fd = open(file, O_RDWR | O_CREAT | O_APPEND,
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DEFFILEMODE)) == -1) {
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if (errno != ENOENT && errno != EBUSY)
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warn("open(%s)", file);
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continue;
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}
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write(fd, "a", 1);
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usleep(arc4random() % 400);
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close(fd);
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unlink(argv[1]);
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}
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return(0);
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}
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