svn commit: r273971 - user/pho/stress2/misc
Peter Holm
pho at FreeBSD.org
Sun Nov 2 14:23:59 UTC 2014
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);
+}
More information about the svn-src-user
mailing list