1#!/bin/sh 2 3# 4# Copyright (c) 2012 Peter Holm <pho@FreeBSD.org> 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29# Scenario based on pr. kern/166340 30# Process under FreeBSD 9.0 hangs in uninterruptable sleep with apparently 31# no syscall (empty wchan). 32 33# http://people.freebsd.org/~pho/stress/log/callout_reset_on.txt 34# Fixed in r243901. 35 36# panic: Bad link elm 0xfffff80012ba8ec8 prev->next != elm 37# https://people.freebsd.org/~pho/stress/log/rrs005.txt 38# Fixed in r278623. 39 40# "ritwait DE 0- 0:00.01 crlogger: writer" seen. 41# https://people.freebsd.org/~pho/stress/log/kostik917.txt 42# Fixed in r302981 43 44. ../default.cfg 45 46rm -f /tmp/crwriter /tmp/crlogger || exit 1 47 48cat > /tmp/crwriter.c <<EOF 49#include <stdio.h> 50#include <stdlib.h> 51#include <string.h> 52#include <unistd.h> 53 54char *txt[] = { 55 "0 This is a line of text: abcdefghijklmnopqrstuvwxyz", 56 "1 Another line of text: ABCDEFGHIJKLMNOPQRSTUVWXYZ", 57 "2 A different line of text", 58 "3 A very, very different text", 59 "4 A much longer line with a lot of characters in the line", 60 "5 Now this is a quite long line of text, with both upper and lower case letters, and one digit!" 61}; 62 63int 64main(void) 65{ 66 int i, j, n; 67 char help[256]; 68 69 for (i = 0; i < 100000; i++) { 70 j = arc4random() % 6; 71 n = arc4random() % strlen(txt[j]); 72 strncpy(help, txt[j], n); 73 help[n] = 0; 74 printf("%s\n", txt[j]); 75 if ((arc4random() % 1000) == 1) 76 usleep(100000); 77 } 78 79 return (0); 80} 81EOF 82mycc -o /tmp/crwriter -Wall -Wextra -O2 -g /tmp/crwriter.c 83rm -f /tmp/crwriter.c 84 85cat > /tmp/crlogger.c <<EOF 86#include <sys/param.h> 87#include <sys/socket.h> 88#include <netinet/in.h> 89#include <netdb.h> 90#include <stdio.h> 91#include <stdlib.h> 92#include <unistd.h> 93#include <signal.h> 94#include <errno.h> 95#include <string.h> 96#include <err.h> 97#include <sys/types.h> 98#include <err.h> 99#include <fcntl.h> 100#include <stdio.h> 101#include <sys/wait.h> 102#include <unistd.h> 103 104#define BARRIER_CREATE 1 105#define BARRIER_WAIT 2 106#define BARRIER_DELETE 3 107 108void 109barrier(int mode) 110{ 111 int fd; 112 char path[128]; 113 114 if (mode == BARRIER_CREATE) { 115 snprintf(path, sizeof(path), "barrier.%d", getpid()); 116 if ((fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0600)) < 0) 117 err(1, "%s", path); 118 } else if (mode == BARRIER_WAIT) { 119 snprintf(path, sizeof(path), "barrier.%d", getppid()); 120 for(;;) { 121 if (access(path, R_OK) == -1) 122 break; 123 usleep(10000); 124 } 125 } else if (mode == BARRIER_DELETE) { 126 snprintf(path, sizeof(path), "barrier.%d", getpid()); 127 if (unlink(path) == -1) 128 err(1, "unlink(%s)", path); 129 } else 130 errx(1, "Bad barrier mode: %d", mode); 131} 132 133pid_t pid; 134int bufsize; 135int port; 136int alarm_exit; 137 138void 139killer(void) 140{ 141 setproctitle("killer"); 142 alarm(120); 143 barrier(BARRIER_WAIT); 144 for (;;) { 145 if (pid == 0) 146 break; 147 if (kill(pid, SIGUSR1) == -1) 148 break; 149 usleep(1000); 150 } 151 _exit(0); 152} 153 154void 155handler(int s __unused) 156{ 157} 158 159void 160ahandler(int s __unused) 161{ 162 if (alarm_exit) 163 _exit(0); 164} 165 166/* Read form socket, discard */ 167static void 168reader(void) { 169 int tcpsock, msgsock; 170 int on; 171 socklen_t len; 172 struct sockaddr_in inetaddr, inetpeer; 173 int n, *buf; 174 175 setproctitle("reader - init"); 176 on = 1; 177 if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) 178 err(1, "socket(), %s:%d", __FILE__, __LINE__); 179 180 if (setsockopt(tcpsock, 181 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 182 err(1, "setsockopt(), %s:%d", __FILE__, __LINE__); 183 184 inetaddr.sin_family = AF_INET; 185 inetaddr.sin_addr.s_addr = INADDR_ANY; 186 inetaddr.sin_port = htons(port); 187 inetaddr.sin_len = sizeof(inetaddr); 188 189 signal(SIGUSR1, handler); 190 alarm(60); 191 if (bind(tcpsock, 192 (struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) 193 err(1, "bind(), %s:%d", __FILE__, __LINE__); 194 195 if (listen(tcpsock, 5) < 0) 196 err(1, "listen(), %s:%d", __FILE__, __LINE__); 197 198 len = sizeof(inetpeer); 199 if ((msgsock = accept(tcpsock, 200 (struct sockaddr *)&inetpeer, &len)) < 0) 201 err(1, "accept(), %s:%d", __FILE__, __LINE__); 202 203 if ((buf = malloc(bufsize)) == NULL) 204 err(1, "malloc(%d), %s:%d", bufsize, __FILE__, __LINE__); 205 setproctitle("reader"); 206 alarm(0); 207 signal(SIGALRM, ahandler); 208 for (;;) { 209 ualarm(5000, 0); 210 if ((n = recvfrom(msgsock, buf, 4, 0, NULL, NULL)) < 0) { 211 if (errno == EAGAIN) 212 continue; 213 err(1, "read(), %s:%d", __FILE__, __LINE__); 214 } 215 if (n == 0) 216 break; 217 if (write(msgsock, "OK", 3) != 3) 218 err(1, "write ack. %s:%d", __FILE__, __LINE__); 219 220 } 221 close(msgsock); 222 _exit(0); 223} 224 225/* read from stdin, write to socket */ 226static void 227writer(void) { 228 int tcpsock, on; 229 struct sockaddr_in inetaddr; 230 struct hostent *hostent; 231 int i, r; 232 char line[1024], ack[80];; 233 234 setproctitle("writer - init"); 235 signal(SIGUSR1, handler); 236 alarm(60); 237 on = 1; 238 for (i = 1; i < 5; i++) { 239 if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) 240 err(1, "socket(), %s:%d", __FILE__, __LINE__); 241 242 if (setsockopt(tcpsock, 243 SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 244 err(1, "setsockopt(), %s:%d", __FILE__, __LINE__); 245 246 hostent = gethostbyname ("localhost"); 247 bzero(&inetaddr, sizeof(inetaddr)); 248 memcpy (&inetaddr.sin_addr.s_addr, hostent->h_addr, 249 sizeof (struct in_addr)); 250 251 inetaddr.sin_family = AF_INET; 252 inetaddr.sin_port = htons(port); 253 inetaddr.sin_len = sizeof(inetaddr); 254 255 r = connect(tcpsock, (struct sockaddr *) &inetaddr, 256 sizeof(inetaddr)); 257 if (r == 0) 258 break; 259 sleep(1); 260 close(tcpsock); 261 } 262 if (r < 0) 263 err(1, "connect(), %s:%d", __FILE__, __LINE__); 264 265 setproctitle("writer"); 266 barrier(BARRIER_DELETE); 267 alarm(0); 268 while (fgets(line, sizeof(line), stdin) != NULL) { 269 alarm(10); 270 alarm_exit = 1; 271 if (write(tcpsock, line, strlen(line)) < 0) 272 err(1, "socket write(). %s:%d", __FILE__, __LINE__); 273 alarm_exit = 0; 274 ualarm(5000, 0); 275 if (recvfrom(tcpsock, ack, 4, 0, NULL, NULL) < 0) { 276 if (errno == EAGAIN) 277 continue; 278 err(1, "read(), %s:%d", __FILE__, __LINE__); 279 } 280 } 281 sleep(30); 282 return; 283} 284 285int 286main(int argc, char **argv) 287{ 288 289 pid_t kpid; 290 291 if (argc != 2) 292 errx(1, "Usage: %s <port number>\n", argv[0]); 293 port = atoi(argv[1]); 294 bufsize = 128; 295 296 barrier(BARRIER_CREATE); 297 signal(SIGCHLD, SIG_IGN); 298 if ((pid = fork()) == 0) 299 reader(); 300 301 if ((kpid = fork()) == 0) 302 killer(); 303 304 writer(); 305 sleep(1); 306 kill(pid, SIGINT); 307 kill(kpid, SIGINT); 308 309 return (0); 310} 311EOF 312mycc -o /tmp/crlogger -Wall -Wextra -O2 -g /tmp/crlogger.c 313rm -f /tmp/crlogger.c 314 315N=200 316cd /tmp 317start=`date '+%s'` 318for i in `jot 40`; do 319 for j in `jot $N`; do 320 /tmp/crwriter | /tmp/crlogger 1236$j 2>/dev/null & 321 done 322 323 for j in `jot $N`; do 324 wait 325 done 326 [ $((`date '+%s'` - start)) -gt 1200 ] && break 327done 328rm -f /tmp/crwriter /tmp/crlogger ./barrier.* 329exit 0 330