svn commit: r287958 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Fri Sep 18 12:50:03 2015
New Revision: 287958
URL: https://svnweb.freebsd.org/changeset/base/287958

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

Added:
  user/pho/stress2/misc/mlockall5.sh   (contents, props changed)

Added: user/pho/stress2/misc/mlockall5.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/mlockall5.sh	Fri Sep 18 12:50:03 2015	(r287958)
@@ -0,0 +1,167 @@
+#!/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.
+#
+# $FreeBSD$
+#
+
+# Regression test for r287591:
+
+# From the commit log:
+# Remove a check which caused spurious SIGSEGV on usermode access to the
+# mapped address without valid pte installed, when parallel wiring of
+# the entry happen.  The entry must be copy on write.  If entry is COW
+# but was already copied, and parallel wiring set
+# MAP_ENTRY_IN_TRANSITION, vm_fault() would sleep waiting for the
+# MAP_ENTRY_IN_TRANSITION flag to clear.  After that, the fault handler
+# is restarted and vm_map_lookup() or vm_map_lookup_locked() trip over
+# the check.  Note that this is race, if the address is accessed after
+# the wiring is done, the entry does not fault at all.
+
+# Test scenario by kib at .
+
+. ../default.cfg
+
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+
+dir=/tmp
+odir=`pwd`
+cd $dir
+sed '1,/^EOF/d' < $odir/$0 > $dir/mlockall5.c
+mycc -o mlockall5 -Wall -Wextra -O0 -g mlockall5.c -lpthread || exit 1
+rm -f mlockall5.c
+cd $odir
+
+mount | grep "on $mntpoint " | grep -q /dev/md && umount -f $mntpoint
+[ -c /dev/md$mdstart ] &&  mdconfig -d -u $mdstart
+mdconfig -a -t swap -s 512m -u $mdstart || exit 1
+bsdlabel -w md$mdstart auto
+newfs $newfs_flags -n md${mdstart}$part > /dev/null
+mount /dev/md${mdstart}$part $mntpoint || exit 1
+
+(cd $mntpoint; /tmp/mlockall5 || echo FAIL)
+
+n=0
+while mount | grep "on $mntpoint " | grep -q /dev/md; do
+	umount $mntpoint || sleep 1
+	n=$((n + 1))
+	[ $n -gt 10 ] && { echo FAIL; exit 1; }
+done
+mdconfig -d -u $mdstart
+rm -rf /tmp/mlockall5
+exit
+
+EOF
+#include <sys/param.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <machine/atomic.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+size_t clen;
+volatile u_int share;
+int ps;
+char *c;
+
+void *
+touch(void *arg __unused)
+{
+
+	int i;
+
+	while (share == 0)
+		;
+	for (i = 0; i < (int)clen; i += ps)
+		c[i] = 1;
+
+	return (NULL);
+}
+
+void *
+ml(void *arg __unused)
+{
+	while (share == 0)
+		;
+	if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1)
+		err(1, "mlock");
+
+	return (NULL);
+}
+
+int
+test(void)
+{
+	pthread_t tid[2];
+	int i, rc, status;
+
+	if (fork() == 0) {
+		alarm(60);
+		rc = pthread_create(&tid[0], NULL, touch, NULL);
+		if (rc != 0)
+			errc(1, rc, "pthread_create()");
+		rc = pthread_create(&tid[1], NULL, ml, NULL);
+		if (rc != 0)
+			errc(1, rc, "pthread_create()");
+		atomic_add_int(&share, 1);
+		for (i = 0; i < (int)nitems(tid); i++) {
+			rc = pthread_join(tid[i], NULL);
+			if (rc != 0)
+				errc(1, rc, "pthread_join(%d)", i);
+		}
+		_exit(0);
+	}
+
+
+	if (wait(&status) == -1)
+		err(1, "wait");
+
+	return (WTERMSIG(status));
+}
+
+int
+main(void)
+{
+	int s;
+
+	ps = getpagesize();
+	clen = 32 * 1024;
+	if ((c = mmap(NULL, clen, PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED,
+	    -1, 0)) == MAP_FAILED)
+		err(1, "mmap");
+
+	s = test();
+
+	return (s);
+}