Date: Tue, 3 Jul 2012 18:54:22 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r238082 - user/pho/stress2/misc Message-ID: <201207031854.q63IsM1F064734@svn.freebsd.org>
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Author: pho Date: Tue Jul 3 18:54:21 2012 New Revision: 238082 URL: http://svn.freebsd.org/changeset/base/238082 Log: Added a regression test. Added: user/pho/stress2/misc/f_offset.sh (contents, props changed) Added: user/pho/stress2/misc/f_offset.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/f_offset.sh Tue Jul 3 18:54:21 2012 (r238082) @@ -0,0 +1,160 @@ +#!/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. +# +# $FreeBSD$ +# + +# Problem seen with atomic assingment of f_offset. Fixed in r238029. + +# Test scenario by kib@ + +here=`pwd` +cd /tmp +sed '1,/^EOF/d' < $here/$0 > f_offset.c +cc -o f_offset -Wall -Wextra -O2 f_offset.c -lpthread +rm -f f_offset.c + +/tmp/f_offset + +rm -f /tmp/f_offset +exit 0 +EOF +/* + Description by kib: +To really exercise the race conditions, all the following items must +be fulfilled simultaneously: +1. you use 32bit host, i.e. i386 +2. you operate on the file offsets larger than 4GB (but see below) +3. there are several threads or processes that operate on the same + file descriptor simultaneously. + +Please note that the normal fork(2) causes file descriptor table +copy, so only rfork(2) call with RFFDG flag unset causes sharing. Or, +multi-threading can be used. + */ + +#include <err.h> +#include <fcntl.h> +#include <pthread.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <unistd.h> + +int errors, fd; +char file[128]; + +#define START 0x100000000ULL +#define N 1000000 + +void * +t1(void *arg __unused) +{ + int i; + off_t offset; + + offset = START + 2; + + for (i = 0; i < N; i++) { + if (lseek(fd, offset, SEEK_SET) == -1) + err(1, "lseek error"); + } + + return (0); +} + +void * +t2(void *arg __unused) +{ + int i; + off_t offset; + + offset = 1; + + for (i = 0; i < N; i++) { + if (lseek(fd, offset, SEEK_SET) == -1) + err(1, "lseek error"); + } + return (0); +} +void * +t3(void *arg __unused) +{ + int i; + off_t offset; + + offset = 1; + + for (i = 0; i < N; i++) { + if ((offset = lseek(fd, 0, SEEK_CUR)) == -1) + err(1, "lseek error"); + if (offset != 1 && offset != START + 2) + fprintf(stderr, "FAIL #%d offset = %10jd (0x%09jx)\n", + errors++, offset, offset); + } + + return (0); +} + +int +main(void) +{ + pthread_t threads[3]; + int r; + int i; + off_t offset; + + snprintf(file, sizeof(file), "file.%06d", getpid()); + if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, 0600)) < 0) + err(1, "%s", file); + + offset = 1; + if (lseek(fd, offset, SEEK_SET) == -1) + err(1, "lseek error"); + + for (i = 0; i < 20 && errors < 10; i++) { + if ((r = pthread_create(&threads[0], NULL, t1, 0)) != 0) + err(1, "pthread_create(): %s\n", strerror(r)); + if ((r = pthread_create(&threads[1], NULL, t2, 0)) != 0) + err(1, "pthread_create(): %s\n", strerror(r)); + if ((r = pthread_create(&threads[2], NULL, t3, 0)) != 0) + err(1, "pthread_create(): %s\n", strerror(r)); + + if (pthread_join(threads[0], NULL) != 0) + err(1, "pthread_join(%d)", 0); + if (pthread_join(threads[1], NULL) != 0) + err(1, "pthread_join(%d)", 1); + if (pthread_join(threads[2], NULL) != 0) + err(1, "pthread_join(%d)", 2); + } + close(fd); + if (unlink(file) == -1) + err(3, "unlink(%s)", file); + + return (0); +}
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