svn commit: r349761 - user/pho/stress2/misc

[Peter Holm]

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 at 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);
+}