Date: Fri, 5 Jul 2019 06:53:12 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r349761 - user/pho/stress2/misc Message-ID: <201907050653.x656rCCN084999@repo.freebsd.org>
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Author: pho Date: Fri Jul 5 06:53:12 2019 New Revision: 349761 URL: https://svnweb.freebsd.org/changeset/base/349761 Log: Added a regression test. Sponsored by: Dell EMC Isilon Added: user/pho/stress2/misc/pts3.sh (contents, props changed) Added: user/pho/stress2/misc/pts3.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/pts3.sh Fri Jul 5 06:53:12 2019 (r349761) @@ -0,0 +1,104 @@ +#!/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. +# +# $FreeBSD$ +# + +# "panic: Most recently used by tty" seen. +# Reported by syzbot+c9b6206303bf47bac87e@syzkaller.appspotmail.com +# Fixed by r349733 + +[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 +kldstat -v | grep -q pty || { kldload pty || exit 0; } + +. ../default.cfg + +here=`pwd` +cd /tmp +sed '1,/^EOF/d' < $here/$0 > pts3.c +mycc -o pts3 -Wall -Wextra -O2 pts3.c || exit 1 +rm -f pts3.c + +/tmp/pts3; s=$? + +rm -f /tmp/pts3 +exit $s +EOF +#include <sys/param.h> +#include <sys/mman.h> +#include <sys/wait.h> + +#include <machine/atomic.h> + +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <unistd.h> + +static volatile u_int *share; +#define SYNC 0 + +int +main(void) +{ + pid_t p, pid; + size_t len; + time_t start; + int fd; + char path[128]; + + len = PAGE_SIZE; + if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED) + err(1, "mmap"); + + p = getpid(); + sprintf(path, "/dev/ptmx"); + start = time(NULL); + while (time(NULL) - start < 60) { + share[SYNC] = 0; + if ((fd = open(path, O_RDWR)) == -1) + err(1,"open()"); + if ((pid = fork()) == 0) { + while (share[SYNC] == 0) + ; + _exit(0); + } + share[SYNC] = 1; + if (fcntl(fd, F_SETOWN, p) == -1) + warn("fcntl()"); + close(fd); + if (waitpid(pid, NULL, 0) != pid) + err(1, "waitpid()"); + } + + return (0); +}
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