svn commit: r289929 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Sun Oct 25 09:16:20 2015
New Revision: 289929
URL: https://svnweb.freebsd.org/changeset/base/289929

Log:
  Added a scenario for triggering EDEADLK in vm_pageout_clean().
  
  Sponsored by:	EMC / Isilon storage division

Added:
  user/pho/stress2/misc/pageout.sh   (contents, props changed)

Added: user/pho/stress2/misc/pageout.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/pageout.sh	Sun Oct 25 09:16:20 2015	(r289929)
@@ -0,0 +1,142 @@
+#!/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.
+#
+# $FreeBSD$
+#
+
+# Trigger the two EDEADLK in vm/vm_pageout.c
+# OOVM deadlock seen
+# https://people.freebsd.org/~pho/stress/log/pageout.txt
+
+. ../default.cfg
+
+dir=/tmp
+odir=`pwd`
+cd $dir
+sed '1,/^EOF/d' < $odir/$0 > $dir/pageout.c
+mycc -o pageout -Wall -Wextra -g pageout.c || exit 1
+rm -f pageout.c
+cd $odir
+
+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 2g -u $mdstart || exit 1
+bsdlabel -w md$mdstart auto
+
+newfs -U md${mdstart}$part > /dev/null
+
+mount /dev/md${mdstart}$part $mntpoint
+chmod 777 $mntpoint
+
+f1=$mntpoint/f1
+dd if=/dev/zero of=$f1 bs=1m count=1k 2>&1 | egrep -v "records|transferred"
+
+daemon sh -c "(cd ../testcases/swap; ./swap -t 5m -i 20 -l 100 -h)" > /dev/null
+(cd /tmp; /tmp/pageout $f1) &
+sleep .2
+while kill -0 $! 2> /dev/null; do
+	mksnap_ffs $mntpoint $mntpoint/.snap/stress2 &&
+	    rm -f $mntpoint/.snap/stress2
+done
+while pgrep -q swap; do
+	pkill swap
+done
+wait
+
+while mount | grep $mntpoint | grep -q /dev/md; do
+	umount $mntpoint || sleep 1
+done
+mdconfig -d -u $mdstart
+rm -f /tmp/pageout /tmp/pageout.core
+exit
+
+EOF
+#include <sys/param.h>
+#include <sys/fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+
+const char *file;
+
+#define RUNTIME 600
+
+void
+test(void)
+{
+	struct stat st;
+	size_t i, len;
+	time_t start;
+	int error, fd, ps;
+	char *p;
+
+	ps = getpagesize();
+	if ((fd = open(file, O_RDWR)) == -1)
+		err(1, "open(%s)", file);
+	if ((error = fstat(fd, &st)) == -1)
+		err(1, "stat(%s)", file);
+	len = round_page(st.st_size);
+	do {
+		if ((p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED,
+		    fd, 0)) == MAP_FAILED) {
+			if (errno == ENOMEM)
+				len -= ps;
+			else
+				err(1, "mmap");
+		}
+	} while (p == MAP_FAILED);
+
+	start = time(NULL);
+	/* Touch all pages of the file. */
+	for (i = 0; i < len; i += ps)
+		p[i] = 1;
+	while (time(NULL) - start < RUNTIME)
+		p[arc4random() % len] = 1;
+
+	if (munmap(p, len) == -1)
+		err(1, "unmap()");
+	close(fd);
+}
+
+int
+main(int argc, char *argv[])
+{
+	if (argc != 2)
+		errx(1, "Usage: %s <file>", argv[0]);
+	file = argv[1];
+
+	test();
+
+	return (0);
+}