1#!/bin/sh 2 3# 4# Copyright (c) 2018 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# fdatasync(2) fuzz. 30 31# Deadlock seen: 32# https://people.freebsd.org/~pho/stress/log/fdatasync.txt 33 34[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 35 36. ../default.cfg 37 38dir=$RUNDIR 39nfiles=500 40[ `df -i $dir | tail -1 | awk '{print $7}'` -lt $nfiles ] && exit 0 41 42odir=`pwd` 43cd /tmp 44sed '1,/^EOF/d' < $odir/$0 > fdatasync.c 45rm -f /tmp/fdatasync 46mycc -o fdatasync -Wall -Wextra -O2 -g fdatasync.c -lpthread || exit 1 47rm -f fdatasync.c 48 49mkdir -p $dir && chmod 777 $dir 50 51cd $dir 52jot $nfiles | xargs touch 53jot $nfiles | xargs chmod 666 54cd $odir 55 56(cd /tmp; /tmp/fdatasync $dir) 57e=$? 58 59rm -rf $dir/* /tmp/fdatasync 60exit $e 61EOF 62#include <sys/param.h> 63#include <sys/resource.h> 64 65#include <err.h> 66#include <errno.h> 67#include <fcntl.h> 68#include <fts.h> 69#include <libutil.h> 70#include <pthread.h> 71#include <pwd.h> 72#include <stdint.h> 73#include <stdio.h> 74#include <stdlib.h> 75#include <string.h> 76#include <unistd.h> 77 78#define N (128 * 1024 / (int)sizeof(u_int32_t)) 79#define RUNTIME 180 80#define THREADS 2 81 82static int fd[900]; 83static u_int32_t r[N]; 84static char *args[2]; 85 86static unsigned long 87makearg(void) 88{ 89 unsigned long val; 90 91 val = arc4random(); 92#if defined(__LP64__) 93 val = (val << 32) | arc4random(); 94 val = val & 0x00007fffffffffffUL; 95#endif 96 97 return(val); 98} 99 100static void * 101test(void *arg __unused) 102{ 103 FTS *fts; 104 FTSENT *p; 105 int ftsoptions, i, n; 106 107 ftsoptions = FTS_PHYSICAL; 108 109 for (;;) { 110 for (i = 0; i < N; i++) 111 r[i] = arc4random(); 112 if ((fts = fts_open(args, ftsoptions, NULL)) == NULL) 113 err(1, "fts_open"); 114 115 i = n = 0; 116 while ((p = fts_read(fts)) != NULL) { 117 if (fd[i] > 0) 118 close(fd[i]); 119 if ((fd[i] = open(p->fts_path, O_RDWR)) == -1) 120 if ((fd[i] = open(p->fts_path, O_WRONLY)) == 121 -1) 122 continue; 123 if (ftruncate(fd[i], 0) != 0) 124 err(1, "ftruncate"); 125 i++; 126 i = i % nitems(fd); 127 } 128 129 if (fts_close(fts) == -1) 130 err(1, "fts_close()"); 131 sleep(1); 132 } 133 return(0); 134} 135 136static void * 137calls(void *arg __unused) 138{ 139 off_t offset; 140 time_t start; 141 int fd2; 142 143 start = time(NULL); 144 while ((time(NULL) - start) < RUNTIME) { 145 fd2 = makearg() % nitems(fd) + 3; 146 offset = makearg(); 147 if (lseek(fd2, offset - 1, SEEK_SET) != -1) { 148 if (write(fd2, "x", 1) != 1) 149 if (errno != EBADF && errno != ENOSPC && 150 errno != E2BIG && errno != ESTALE && 151 errno != EFBIG) 152 warn("write"); 153 } else 154 if (errno != EBADF) 155 warn("lseek"); 156 if (fdatasync(fd2) == -1) 157 if (errno != EBADF) 158 warn("x"); 159 160 } 161 162 return (0); 163} 164 165int 166main(int argc, char **argv) 167{ 168 struct passwd *pw; 169 pthread_t rp, cp[THREADS]; 170 int e, i; 171 172 if (argc != 2) { 173 fprintf(stderr, "Usage: %s <dir>\n", argv[0]); 174 exit(1); 175 } 176 args[0] = argv[1]; 177 args[1] = 0; 178 179 if ((pw = getpwnam("nobody")) == NULL) 180 err(1, "failed to resolve nobody"); 181 if (setgroups(1, &pw->pw_gid) || 182 setegid(pw->pw_gid) || setgid(pw->pw_gid) || 183 seteuid(pw->pw_uid) || setuid(pw->pw_uid)) 184 err(1, "Can't drop privileges to \"nobody\""); 185 endpwent(); 186 187 if ((e = pthread_create(&rp, NULL, test, NULL)) != 0) 188 errc(1, e, "pthread_create"); 189 usleep(1000); 190 for (i = 0; i < THREADS; i++) 191 if ((e = pthread_create(&cp[i], NULL, calls, NULL)) != 0) 192 errc(1, e, "pthread_create"); 193 for (i = 0; i < THREADS; i++) 194 pthread_join(cp[i], NULL); 195 196 return (0); 197} 198