#!/bin/sh
#
# Copyright (c) 2012 Peter Holm <pho@FreeBSD.org>
# All rights reserved.
#
# 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.
#
# Scenario based on pr. kern/166340
# Process under FreeBSD 9.0 hangs in uninterruptable sleep with apparently
# no syscall (empty wchan).
# http://people.freebsd.org/~pho/stress/log/callout_reset_on.txt
# Fixed in r243901.
# panic: Bad link elm 0xfffff80012ba8ec8 prev->next != elm
# https://people.freebsd.org/~pho/stress/log/rrs005.txt
# Fixed in r278623.
# "ritwait DE 0- 0:00.01 crlogger: writer" seen.
# https://people.freebsd.org/~pho/stress/log/kostik917.txt
# Fixed in r302981
. ../default.cfg
rm -f /tmp/crwriter /tmp/crlogger || exit 1
cat > /tmp/crwriter.c <<EOF
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
char *txt[] = {
"0 This is a line of text: abcdefghijklmnopqrstuvwxyz",
"1 Another line of text: ABCDEFGHIJKLMNOPQRSTUVWXYZ",
"2 A different line of text",
"3 A very, very different text",
"4 A much longer line with a lot of characters in the line",
"5 Now this is a quite long line of text, with both upper and lower case letters, and one digit!"
};
int
main(void)
{
int i, j, n;
char help[256];
for (i = 0; i < 100000; i++) {
j = arc4random() % 6;
n = arc4random() % strlen(txt[j]);
strncpy(help, txt[j], n);
help[n] = 0;
printf("%s\n", txt[j]);
if ((arc4random() % 1000) == 1)
usleep(100000);
}
return (0);
}
EOF
mycc -o /tmp/crwriter -Wall -Wextra -O2 -g /tmp/crwriter.c
rm -f /tmp/crwriter.c
cat > /tmp/crlogger.c <<EOF
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <err.h>
#include <sys/types.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/wait.h>
#include <unistd.h>
#define BARRIER_CREATE 1
#define BARRIER_WAIT 2
#define BARRIER_DELETE 3
void
barrier(int mode)
{
int fd;
char path[128];
if (mode == BARRIER_CREATE) {
snprintf(path, sizeof(path), "barrier.%d", getpid());
if ((fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0600)) < 0)
err(1, "%s", path);
} else if (mode == BARRIER_WAIT) {
snprintf(path, sizeof(path), "barrier.%d", getppid());
for(;;) {
if (access(path, R_OK) == -1)
break;
usleep(10000);
}
} else if (mode == BARRIER_DELETE) {
snprintf(path, sizeof(path), "barrier.%d", getpid());
if (unlink(path) == -1)
err(1, "unlink(%s)", path);
} else
errx(1, "Bad barrier mode: %d", mode);
}
pid_t pid;
int bufsize;
int port;
int alarm_exit;
void
killer(void)
{
setproctitle("killer");
alarm(120);
barrier(BARRIER_WAIT);
for (;;) {
if (pid == 0)
break;
if (kill(pid, SIGUSR1) == -1)
break;
usleep(1000);
}
_exit(0);
}
void
handler(int s __unused)
{
}
void
ahandler(int s __unused)
{
if (alarm_exit)
_exit(0);
}
/* Read form socket, discard */
static void
reader(void) {
int tcpsock, msgsock;
int on;
socklen_t len;
struct sockaddr_in inetaddr, inetpeer;
int n, *buf;
setproctitle("reader - init");
on = 1;
if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
err(1, "socket(), %s:%d", __FILE__, __LINE__);
if (setsockopt(tcpsock,
SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0)
err(1, "setsockopt(), %s:%d", __FILE__, __LINE__);
inetaddr.sin_family = AF_INET;
inetaddr.sin_addr.s_addr = INADDR_ANY;
inetaddr.sin_port = htons(port);
inetaddr.sin_len = sizeof(inetaddr);
signal(SIGUSR1, handler);
alarm(60);
if (bind(tcpsock,
(struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0)
err(1, "bind(), %s:%d", __FILE__, __LINE__);
if (listen(tcpsock, 5) < 0)
err(1, "listen(), %s:%d", __FILE__, __LINE__);
len = sizeof(inetpeer);
if ((msgsock = accept(tcpsock,
(struct sockaddr *)&inetpeer, &len)) < 0)
err(1, "accept(), %s:%d", __FILE__, __LINE__);
if ((buf = malloc(bufsize)) == NULL)
err(1, "malloc(%d), %s:%d", bufsize, __FILE__, __LINE__);
setproctitle("reader");
alarm(0);
signal(SIGALRM, ahandler);
for (;;) {
ualarm(5000, 0);
if ((n = recvfrom(msgsock, buf, 4, 0, NULL, NULL)) < 0) {
if (errno == EAGAIN)
continue;
err(1, "read(), %s:%d", __FILE__, __LINE__);
}
if (n == 0)
break;
if (write(msgsock, "OK", 3) != 3)
err(1, "write ack. %s:%d", __FILE__, __LINE__);
}
close(msgsock);
_exit(0);
}
/* read from stdin, write to socket */
static void
writer(void) {
int tcpsock, on;
struct sockaddr_in inetaddr;
struct hostent *hostent;
int i, r;
char line[1024], ack[80];;
pid_t ppid;
setproctitle("writer - init");
ppid = getppid();
signal(SIGUSR1, handler);
alarm(60);
on = 1;
for (i = 1; i < 5; i++) {
if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
err(1, "socket(), %s:%d", __FILE__, __LINE__);
if (setsockopt(tcpsock,
SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0)
err(1, "setsockopt(), %s:%d", __FILE__, __LINE__);
hostent = gethostbyname ("localhost");
bzero(&inetaddr, sizeof(inetaddr));
memcpy (&inetaddr.sin_addr.s_addr, hostent->h_addr,
sizeof (struct in_addr));
inetaddr.sin_family = AF_INET;
inetaddr.sin_port = htons(port);
inetaddr.sin_len = sizeof(inetaddr);
r = connect(tcpsock, (struct sockaddr *) &inetaddr,
sizeof(inetaddr));
if (r == 0)
break;
sleep(1);
close(tcpsock);
}
if (r < 0)
err(1, "connect(), %s:%d", __FILE__, __LINE__);
setproctitle("writer");
barrier(BARRIER_DELETE);
alarm(0);
while (fgets(line, sizeof(line), stdin) != NULL) {
alarm(10);
alarm_exit = 1;
if (write(tcpsock, line, strlen(line)) < 0)
err(1, "socket write(). %s:%d", __FILE__, __LINE__);
alarm_exit = 0;
ualarm(5000, 0);
if (recvfrom(tcpsock, ack, 4, 0, NULL, NULL) < 0) {
if (errno == EAGAIN)
continue;
err(1, "read(), %s:%d", __FILE__, __LINE__);
}
}
sleep(30);
return;
}
int
main(int argc, char **argv)
{
pid_t kpid;
if (argc != 2)
errx(1, "Usage: %s <port number>\n", argv[0]);
port = atoi(argv[1]);
bufsize = 128;
barrier(BARRIER_CREATE);
signal(SIGCHLD, SIG_IGN);
if ((pid = fork()) == 0)
reader();
if ((kpid = fork()) == 0)
killer();
writer();
sleep(1);
kill(pid, SIGINT);
kill(kpid, SIGINT);
return (0);
}
EOF
mycc -o /tmp/crlogger -Wall -Wextra -O2 -g /tmp/crlogger.c
rm -f /tmp/crlogger.c
N=200
cd /tmp
start=`date '+%s'`
for i in `jot 40`; do
for j in `jot $N`; do
/tmp/crwriter | /tmp/crlogger 1236$j 2>/dev/null &
done
for j in `jot $N`; do
wait
done
[ $((`date '+%s'` - start)) -gt 1200 ] && break
done
rm -f /tmp/crwriter /tmp/crlogger ./barrier.*
exit 0
