1#!/bin/sh 2 3# 4# Copyright (c) 2017 Dell EMC Isilon 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# Hunt for lost wakeup problem. 30 31. ../default.cfg 32 33dir=/tmp 34odir=`pwd` 35cd $dir 36sed '1,/^EOF/d' < $odir/$0 > $dir/pause.c 37mycc -o pause -Wall -Wextra -O0 -g pause.c || exit 1 38rm -f pause.c 39 40pkill pause 41$dir/pause & 42pid=$! 43start=`date +%s` 44while pgrep -q pause; do 45 sleep .5 46 [ $((`date +%s` - $start)) -gt 1200 ] && 47 { echo "Timed out"; pgrep pause | xargs ps -lp; exit 1; } 48done 49wait $pid 50s=$? 51 52cd $odir 53rm -rf $dir/pause 54exit $s 55 56EOF 57#include <sys/param.h> 58#include <sys/mman.h> 59#include <sys/stat.h> 60#include <sys/wait.h> 61 62#include <machine/atomic.h> 63 64#include <err.h> 65#include <errno.h> 66#include <fcntl.h> 67#include <signal.h> 68#include <stdio.h> 69#include <stdlib.h> 70#include <time.h> 71#include <unistd.h> 72 73static volatile u_int *share; 74 75#define PARALLEL 400 76#define RUNTIME (5 * 60) 77#define SYNC 0 78 79void 80hand(int i __unused) { 81} 82 83static void 84test(int idx) 85{ 86 pid_t pid; 87 time_t start; 88 89 atomic_add_int(&share[SYNC], 1); 90 while (share[SYNC] != PARALLEL) 91 usleep(1); 92 share[idx] = 0; 93 94 if ((pid = fork()) == 0) { 95 share[idx] = 1; 96 for (;;) 97 pause(); 98 _exit(0); 99 } 100 while (share[idx] == 0) 101 usleep(10); 102 start = time(NULL); 103 while (time(NULL) - start < 60) { 104 usleep(arc4random() % 100); 105 if (kill(pid, SIGHUP) == -1) 106 err(1, "kill(%d)", pid); 107 } 108 kill(pid, SIGTERM); 109 if (waitpid(pid, NULL, 0) != pid) 110 err(1, "waitpid(%d)", pid); 111 112 _exit(0); 113} 114 115int 116main(void) 117{ 118 pid_t pids[PARALLEL]; 119 struct sigaction sa; 120 size_t len; 121 time_t start; 122 int e, i, status; 123 124 sa.sa_handler = hand; 125 sigemptyset(&sa.sa_mask); 126 sa.sa_flags = 0; 127 if (sigaction(SIGHUP, &sa, NULL) == -1) 128 err(1, "sigaction"); 129 130 e = 0; 131 len = PAGE_SIZE; 132 if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE, 133 MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED) 134 err(1, "mmap"); 135 136 start = time(NULL); 137 while ((time(NULL) - start) < RUNTIME && e == 0) { 138 share[SYNC] = 0; 139 for (i = 0; i < PARALLEL; i++) { 140 if ((pids[i] = fork()) == 0) 141 test(i + 1); 142 if (pids[i] == -1) 143 err(1, "fork()"); 144 } 145 for (i = 0; i < PARALLEL; i++) { 146 if (waitpid(pids[i], &status, 0) == -1) 147 err(1, "waitpid(%d)", pids[i]); 148 if (status != 0) { 149 if (WIFSIGNALED(status)) 150 fprintf(stderr, 151 "pid %d exit signal %d\n", 152 pids[i], WTERMSIG(status)); 153 } 154 e += status == 0 ? 0 : 1; 155 } 156 } 157 158 return (e); 159} 160