Date: Tue, 12 Jul 2016 09:32:53 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r302639 - user/pho/stress2/misc Message-ID: <201607120932.u6C9WrBv051874@repo.freebsd.org>
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Author: pho Date: Tue Jul 12 09:32:53 2016 New Revision: 302639 URL: https://svnweb.freebsd.org/changeset/base/302639 Log: Added a regression test. Sponsored by: EMC / Isilon Storage Division Added: user/pho/stress2/misc/select.sh (contents, props changed) Added: user/pho/stress2/misc/select.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/select.sh Tue Jul 12 09:32:53 2016 (r302639) @@ -0,0 +1,161 @@ +#!/bin/sh + +# +# Copyright (c) 2016 EMC Corp. +# 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. +# +# $FreeBSD$ +# + +# The combination of ualarm() firing before and after the select(2) timeout +# triggers select() to return EINTR a number of times. Not seen on Lunux or +# OS X. Problem only seen on i386. + +# Test scenario suggestion by kib@ + +# "FAIL n = 2389" seen on r302369, no debug build. +# Fixed by: r302573. + +. ../default.cfg + +dir=/tmp +odir=`pwd` +cd $dir +sed '1,/^EOF/d' < $odir/$0 > $dir/select.c +mycc -o select -Wall -Wextra -O0 -g select.c || exit 1 +rm -f select.c +cd $odir + +/tmp/select +s=$? + +rm -f /tmp/select +exit $s +EOF +#include <sys/param.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <sys/wait.h> + +#include <machine/atomic.h> + +#include <err.h> +#include <errno.h> +#include <fcntl.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <unistd.h> + +volatile u_int *share; +volatile int alarms; +int lines; + +#define N 2000 /* also seen fail with N = 20.000 */ +#define LINES 128000 +#define PARALLEL 16 /* Fails seen with 1 - 16 */ +#define RUNTIME (10 * 60) +#define SYNC 0 + +void +handler(int i __unused) { + alarms++; +} + +void +test(void) +{ + struct timeval tv; + int i, n, r, s; + + atomic_add_int(&share[SYNC], 1); + while (share[SYNC] != PARALLEL) + ; + + signal(SIGALRM, handler); + s = 0; + for (i = 0; i < lines; i++) { + if (arc4random() % 100 < 50) + ualarm(N / 2, 0); + else + ualarm(N * 2, 0); + tv.tv_sec = 0; + tv.tv_usec = N; + n = 0; + do { + r = select(1, NULL, NULL, NULL, &tv); + n++; + } while (r == -1 && errno == EINTR); + if (r == -1) + err(1, "select"); + ualarm(0, 0); + if (n > 2) { + fprintf(stderr, "FAIL n = %d, tv = %ld.%06ld\n", + n, (long)tv.tv_sec, tv.tv_usec); + s = 1; + break; + } + + } + + _exit(s); +} + +int +main(void) +{ + size_t len; + time_t start; + int e, i, j, pids[PARALLEL], status; + + lines = LINES / PARALLEL; + if (lines == 0) + lines = 1; + e = 0; + len = PAGE_SIZE; + if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED) + err(1, "mmap"); + + start = time(NULL); + while ((time(NULL) - start) < RUNTIME && e == 0) { + share[SYNC] = 0; + for (i = 0; i < PARALLEL; i++) { + if ((pids[i] = fork()) == 0) + test(); + } + for (i = 0; i < PARALLEL; i++) { + waitpid(pids[i], &status, 0); + e += status == 0 ? 0 : 1; + if (status != 0) { + for (j = i + 1; j < PARALLEL; j++) + kill(pids[j], SIGINT); + } + } + } + + return (e); +}
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