Date: Sun, 2 Nov 2014 14:23:59 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r273971 - user/pho/stress2/misc Message-ID: <201411021423.sA2ENxj3039142@svn.freebsd.org>
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Author: pho Date: Sun Nov 2 14:23:58 2014 New Revision: 273971 URL: https://svnweb.freebsd.org/changeset/base/273971 Log: Added regression test for r273966. Sponsored by: EMC / Isilon storage division Added: user/pho/stress2/misc/spin.sh (contents, props changed) Added: user/pho/stress2/misc/spin.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/spin.sh Sun Nov 2 14:23:58 2014 (r273971) @@ -0,0 +1,129 @@ +#!/bin/sh + +# +# Copyright (c) 2014 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. +# +# $FreeBSD$ +# + +[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 + +# Demonstrate starvation: Thread stuck in "ufs" for minutes. +# Only seen with >= 16 CPUs. +# Not a problem with 4BSD. +# http://people.freebsd.org/~pho/stress/log/spin.txt +# Fixed by r273966. + +mntpoint=/mnt +mdstart=5 +part=a +timeout=1200 +[ -r ../default.cfg ] && . ../default.cfg + +here=`pwd` +cd /tmp +sed '1,/^EOF/d' < $here/$0 > spin.c +cc -o spin -Wall -Wextra -O0 spin.c || exit 1 +rm -f spin.c +cd $here + +mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint +mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart + +mdconfig -a -t swap -s 1g -u $mdstart || exit 1 +bsdlabel -w md$mdstart auto +newfs $newfs_flags -n md${mdstart}$part > /dev/null +mount /dev/md${mdstart}$part $mntpoint + +cpus=`sysctl hw.ncpu | sed 's/.*: //'` +(cd $mntpoint; /tmp/spin $((cpus + 1))) & +error=0 +n=0 +while kill -0 $! 2>/dev/null; do + sleep 1 + n=$((n + 1)) + if [ $n -gt $timeout ]; then + echo FAIL + ps -l | grep -v sed | sed -n '1p;/ufs/p' + pkill spin + error=1 + fi +done +wait + +while mount | grep $mntpoint | grep -q /dev/md; do + umount $mntpoint || sleep 1 +done +mdconfig -d -u $mdstart +rm -f /tmp/spin +exit $error +EOF +#include <sys/param.h> +#include <sys/wait.h> + +#include <err.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +void +work(void) +{ + + while (access("rendezvous", R_OK) != 0) + ; + + _exit(0); +} + +int +main(int argc, char **argv) +{ + int fd, i, parallel; + + if (argc == 2) + parallel = atoi(argv[1]); + else + errx(1, "Usage: %s <cpus>", argv[0]); + + for (i = 0; i < parallel; i++) { + if (fork() == 0) + work(); + } + + /* open(2) blocked on "ufs" for minutes */ + if ((fd = open("rendezvous", O_CREAT, 0644)) == -1) + err(1, "open()"); + close(fd); + + for (i = 0; i < parallel; i++) + wait(NULL); + + if (unlink("rendezvous") == -1) + err(1, "unlink()"); + + return (0); +}
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