Date: Sun, 30 Jun 2019 06:44:35 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r349553 - user/pho/stress2/misc Message-ID: <201906300644.x5U6iZUg080882@repo.freebsd.org>
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Author: pho Date: Sun Jun 30 06:44:35 2019 New Revision: 349553 URL: https://svnweb.freebsd.org/changeset/base/349553 Log: Added a regression test. Sponsored by: Dell EMC Isilon Added: user/pho/stress2/misc/mkfifo8.sh Added: user/pho/stress2/misc/mkfifo8.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/mkfifo8.sh Sun Jun 30 06:44:35 2019 (r349553) @@ -0,0 +1,202 @@ +#!/bin/sh + +# +# SPDX-License-Identifier: BSD-2-Clause-FreeBSD +# +# Copyright (c) 2019 Dell EMC Isilon +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# 1. Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# 2. Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# +# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +# SUCH DAMAGE. +# +# $FreeBSD$ +# + +# Regression test for https://reviews.freebsd.org/D20784 +# "Fix mutual exclusion in pipe_direct_write()" +# https://people.freebsd.org/~pho/stress/log/mkfifo8.txt + +# Reported by syzbot+21811cc0a89b2a87a9e7@syzkaller.appspotmail.com +# Test scenario suggestion by markj@ +# Fixed by r349546 + +. ../default.cfg +[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 + +dir=/tmp +odir=`pwd` +cd $dir +sed '1,/^EOF/d' < $odir/$0 > $dir/mkfifo8.c +mycc -o mkfifo8 -Wall -Wextra -O0 -g mkfifo8.c || exit 1 +rm -f mkfifo8.c +cd $odir + +set -e +mount | grep -q "on $mntpoint " && umount -f $mntpoint +[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart +mdconfig -a -t swap -s 1g -u $mdstart +newfs $newfs_flags /dev/md$mdstart > /dev/null +mount /dev/md$mdstart $mntpoint +set +e + +cd $mntpoint +$dir/mkfifo8; s=$? +cd $odir + +while mount | grep -q "on $mntpoint "; do + umount $mntpoint || sleep 1 +done +mdconfig -d -u $mdstart +rm -rf /tmp/mkfifo8 +exit $s + +EOF +#include <sys/param.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <sys/wait.h> + +#include <machine/atomic.h> + +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <unistd.h> + +#define ACT 1 +#define NPROCS 64 +#define PARALLEL 4 +#define RUNTIME 60 +#define SIZ 8192 +#define SYNC 0 + +static volatile u_int *share; +static int fd; +static char cp[SIZ]; + +static void +tw(void) +{ + int r; + + atomic_add_int(&share[ACT], 1); + r = write(fd, cp, SIZ); + if (r == -1) + warn("write"); + + _exit(0); +} + +static void +tr(void) +{ + int i, r; + char cp[SIZ]; + + while (share[ACT] < NPROCS / 2) + usleep(10); + for (i = 0; i < NPROCS; i++) { + r = read(fd, cp, SIZ); + if (r == -1) + warn("read"); + } + + _exit(0); +} + +static void +test(void) +{ + pid_t pid[NPROCS + 1]; + int i; + char file[80]; + + atomic_add_int(&share[SYNC], 1); + while (share[SYNC] != PARALLEL) + ; + + snprintf(file, sizeof(file), "fifo.%d", getpid()); + if (mkfifo(file, DEFFILEMODE) == -1) + err(1, "mkfifo(%s)", file); + if ((fd = open(file, O_RDWR)) == -1) + err(1, "open(%s)", file); + + for (i = 0; i < NPROCS; i++) { + if ((pid[i] = fork()) == 0) + tw(); + } + if ((pid[NPROCS] = fork()) == 0) + tr(); + + for (i = 0; i < NPROCS + 1; i++) { + if (waitpid(pid[i], NULL, 0) != pid[i]) + err(1, "waitpid"); + } + close(fd); + unlink(file); + + _exit(0); +} + +int +main(void) +{ + pid_t pids[PARALLEL]; + size_t len; + time_t start; + int e, i, status; + + e = 0; + len = PAGE_SIZE; + if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED) + err(1, "mmap"); + + for (i = 0; i < SIZ; i += PAGE_SIZE) + cp[i] = 1; + start = time(NULL); + while ((time(NULL) - start) < RUNTIME && e == 0) { + share[SYNC] = 0; + share[ACT] = 0; + for (i = 0; i < PARALLEL; i++) { + if ((pids[i] = fork()) == 0) + test(); + if (pids[i] == -1) + err(1, "fork()"); + } + for (i = 0; i < PARALLEL; i++) { + if (waitpid(pids[i], &status, 0) == -1) + err(1, "waitpid(%d)", pids[i]); + if (status != 0) { + if (WIFSIGNALED(status)) + fprintf(stderr, + "pid %d exit signal %d\n", + pids[i], WTERMSIG(status)); + } + e += status == 0 ? 0 : 1; + } + } + + return (e); +}
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