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#!/bin/sh
#
# Copyright (c) 2015 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.
#
# The core file vnode is unreferenced before notification is sent.
# Problem reported by sbruno@
# http://people.freebsd.org/~pho/stress/log/core5.txt
# Fixed by r279237.
# 20150714 Slowdown seen with core5 waiting in vlruwk.
# sysctl vfs.vlru_allow_cache_src=1 used to resolve this.
# For now change MAXVNODES from 1.000 to 5.000.
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
. ../default.cfg
here=`pwd`
cd /tmp
sed '1,/^EOF/d' < $here/$0 > core5.c
mycc -o core5 -Wall -Wextra -O0 -g core5.c || exit 1
rm -f core5.c
cat > core5-dumper.c << EOT
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
int
main(int argc __unused, char *argv[])
{
time_t start;
char core[80];
snprintf(core, sizeof(core), "%s.core", argv[0]);
if (unlink(core) == -1)
if (errno != ENOENT)
warn("unlink(%s)", core);
start = time(NULL);
while (time(NULL) - start < 600) {
if (fork() == 0)
raise(SIGSEGV);
wait(NULL);
}
if (unlink(core) == -1)
if (errno != ENOENT)
warn("unlink(%s)", core);
return (0);
}
EOT
mycc -o core5-dumper -Wall -Wextra -O0 -g core5-dumper.c || exit 1
rm -f core5-dumper.c
for i in `jot 10`; do
cp core5-dumper core5-dumper$i
done
rm -f core5-dumper
mount | grep -q "on $mntpoint " && umount $mntpoint
[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart
mdconfig -a -t malloc -s 1g -u $mdstart
newfs -b 4096 -f 512 -i 2048 md$mdstart > /dev/null
mount -o async /dev/md$mdstart $mntpoint || exit 1
cp /tmp/core5 $mntpoint
mkdir $mntpoint/dir
cd $mntpoint
mp2=${mntpoint}2
[ -d $mp2 ] || mkdir $mp2
mount | grep -q "on $mp2 " && umount $mp2
mount -o size=2g -t tmpfs tmpfs $mp2 || exit 1
for i in `jot 10`; do
(cd $mp2; /tmp/core5-dumper$i ) &
done
maxvnodes=`sysctl -n kern.maxvnodes`
trap "sysctl kern.maxvnodes=$maxvnodes > /dev/null" EXIT INT
$mntpoint/core5 $mntpoint/dir
wait
umount $mp2
cd $here
while mount | grep -q "on $mntpoint "; do
umount $mntpoint || sleep 1
done
mdconfig -d -u $mdstart
rm -f /tmp/core5 /tmp/core5-dumper* /tmp/core5-dumper*.core
exit 0
EOF
#include <sys/wait.h>
#include <sys/sysctl.h>
#include <err.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#define MAXVNODES 5000
#define NBFILES 10000
#define PARALLEL 4
#define RTIME (10 * 60)
char *path;
void
test(int n)
{
int fd, i;
char file[80];
usleep(arc4random() % 1000);
for (i = 0; i < NBFILES; i++) {
snprintf(file, sizeof(file), "%s/f%d.%06d", path, n, i);
if ((fd = open(file, O_CREAT, 0644)) == -1) {
warn("open(%s)", file);
break;
}
close(fd);
}
for (i = 0; i < NBFILES; i++) {
snprintf(file, sizeof(file), "%s/f%d.%06d", path, n, i);
if (unlink(file) == -1)
err(1, "unlink(%s)", file);
}
_exit(0);
}
int
main(int argc, char *argv[])
{
size_t len;
time_t start;
unsigned long nv, maxvnodes;
int j;
if (argc != 2)
errx(1, "Usage: %s <path>", argv[0]);
path = argv[1];
nv = MAXVNODES;
len = sizeof(maxvnodes);
if (sysctlbyname("kern.maxvnodes", &maxvnodes, &len, &nv,
sizeof(nv)) != 0)
err(1, "sysctl kern.maxvnodes 1");
start = time(NULL);
while (time(NULL) - start < RTIME) {
for (j = 0; j < PARALLEL; j++)
if (fork() == 0)
test(j);
for (j = 0; j < PARALLEL; j++)
wait(NULL);
}
if (sysctlbyname("kern.maxvnodes", NULL, NULL, &maxvnodes,
sizeof(maxvnodes)) != 0)
err(1, "sysctl kern.maxvnodes 2");
return (0);
}
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