svn commit: r294217 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Sun Jan 17 12:19:57 2016
New Revision: 294217
URL: https://svnweb.freebsd.org/changeset/base/294217

Log:
  Added a regression test.
  
  Sponsored by:	EMC / Isilon storage division

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

Added: user/pho/stress2/misc/dev.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/dev.sh	Sun Jan 17 12:19:57 2016	(r294217)
@@ -0,0 +1,128 @@
+#!/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.
+#
+# $FreeBSD$
+#
+
+# Test parallel read access to /dev.
+
+# "panic: Most recently used by DEVFS1" seen.
+# https://people.freebsd.org/~pho/stress/log/dev.txt
+# Fixed by r293826.
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+
+. ../default.cfg
+
+here=`pwd`
+cd /tmp
+sed '1,/^EOF/d' < $here/$0 > dev.c
+mycc -o dev -Wall -Wextra -O2 dev.c || exit 1
+rm -f dev.c
+
+daemon sh -c \
+    "(cd $here/../testcases/swap; ./swap -t 6m -i 20 -k -l 100)" > \
+    /dev/null
+
+/tmp/dev	# Note: this runs as root.
+
+while pkill -9 swap; do
+	:
+done
+
+rm -f /tmp/dev
+exit
+EOF
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fts.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+
+#define PARALLEL 4
+#define RUNTIME 300
+
+char path[80];
+
+void
+churn(char *path)
+{
+	FTS *fts;
+	FTSENT *p;
+	time_t start;
+	int fd, ftsoptions;
+	char *args[2];
+
+	ftsoptions = FTS_PHYSICAL;
+	args[0] = path;
+	args[1] = 0;
+
+	start = time(NULL);
+	while (time(NULL) - start < RUNTIME) {
+		if ((fts = fts_open(args, ftsoptions, NULL)) == NULL)
+			err(1, "fts_open");
+
+		while ((p = fts_read(fts)) != NULL) {
+			if (p->fts_info == FTS_D ||
+			   p->fts_info == FTS_DP)
+				continue;
+			if ((fd = open(p->fts_path, O_RDONLY)) == -1)
+				continue;
+			usleep(arc4random() % 1000);
+			close(fd);
+
+		}
+
+		if (errno != 0 && errno != ENOENT)
+			warn("fts_read");
+		if (fts_close(fts) == -1)
+			err(1, "fts_close()");
+	}
+
+	_exit(0);
+}
+
+int
+main(void)
+{
+	int i;
+
+	for (i = 0; i < PARALLEL; i++)
+		if (fork() == 0)
+			churn("/dev");
+
+	for (i = 0; i < PARALLEL; i++)
+		wait(NULL);
+
+	return (0);
+}