1#!/bin/sh 2 3# 4# Copyright (c) 2016 EMC Corp. 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# Test parallel read access to /dev. 30 31# "panic: Most recently used by DEVFS1" seen. 32# https://people.freebsd.org/~pho/stress/log/dev.txt 33# Fixed by r293826. 34 35[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 36 37. ../default.cfg 38 39here=`pwd` 40cd /tmp 41sed '1,/^EOF/d' < $here/$0 > dev.c 42mycc -o dev -Wall -Wextra -O2 dev.c || exit 1 43rm -f dev.c 44 45echo "Expect: g_access(958): provider ufsid/5c581221fcac7d80 has error 6 set" 46daemon sh -c \ 47 "(cd $here/../testcases/swap; ./swap -t 6m -i 20 -k -l 100)" > \ 48 /dev/null 49 50/tmp/dev # Note: this runs as root. 51s=$? 52 53while pkill -9 swap; do 54 : 55done 56 57rm -f /tmp/dev 58exit $s 59EOF 60#include <sys/types.h> 61#include <sys/wait.h> 62 63#include <err.h> 64#include <errno.h> 65#include <fcntl.h> 66#include <fts.h> 67#include <stdlib.h> 68#include <stdio.h> 69#include <string.h> 70#include <time.h> 71#include <unistd.h> 72 73#define PARALLEL 4 74#define RUNTIME 300 75 76char path[80]; 77 78void 79churn(char *path) 80{ 81 FTS *fts; 82 FTSENT *p; 83 time_t start; 84 int fd, ftsoptions; 85 char *args[2]; 86 87 ftsoptions = FTS_PHYSICAL; 88 args[0] = path; 89 args[1] = 0; 90 91 start = time(NULL); 92 while (time(NULL) - start < RUNTIME) { 93 if ((fts = fts_open(args, ftsoptions, NULL)) == NULL) 94 err(1, "fts_open"); 95 96 while ((p = fts_read(fts)) != NULL) { 97 if (p->fts_info == FTS_D || 98 p->fts_info == FTS_DP) 99 continue; 100 if (strstr(p->fts_path, "ttyu") != NULL) 101 continue; 102 if (strstr(p->fts_path, "fcdm") != NULL) 103 continue; 104 if ((fd = open(p->fts_path, O_RDONLY|O_NONBLOCK)) == -1) 105 continue; 106 usleep(arc4random() % 1000); 107 close(fd); 108 109 } 110 111 if (errno != 0 && errno != ENOENT) 112 warn("fts_read"); 113 if (fts_close(fts) == -1) 114 err(1, "fts_close()"); 115 } 116 117 _exit(0); 118} 119 120int 121main(void) 122{ 123 int e, i, status;; 124 125 e = 0; 126 for (i = 0; i < PARALLEL; i++) 127 if (fork() == 0) 128 churn("/dev"); 129 130 for (i = 0; i < PARALLEL; i++) { 131 wait(&status); 132 if (status != 0) 133 e++; 134 } 135 136 return (e); 137} 138