1 files changed, 97 insertions, 0 deletions
diff --git a/tools/test/stress2/misc/inversion.sh b/tools/test/stress2/misc/inversion.sh
new file mode 100755
index 000000000000..759549af0233
--- /dev/null
+++ b/tools/test/stress2/misc/inversion.sh
@@ -0,0 +1,97 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
+# 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.
+#
+
+# Provokes a deadlock by lower priority process holding a lock and
+# never beeing run
+
+. ../default.cfg
+
+dir=$RUNDIR
+N=5	# Number of CPUs + 1
+M=25	# Number of lower priority jobs
+
+odir=`pwd`
+mkdir -p $dir || exit 1
+cd $dir
+sed '1,/^EOF/d' < $odir/$0 > $dir/inversion.c
+mycc -o inversion -Wall inversion.c
+rm -f inversion.c
+
+mp=`df $dir | tail -1 | awk '{print $NF}'`
+mp=`mount | grep "on $mp "`
+if echo $mp | grep -wq nfs; then
+	pgrep -q lockd || { echo "lockd not running"; exit 0; }
+fi
+
+for i in `jot $N`; do
+	./inversion 600 &
+done
+
+while pgrep inversion > /dev/null; do
+	(
+		for i in `jot $M`; do
+			nice -n 20 lockf -s -t 0 .lock pwd > /dev/null &
+		done
+		for i in `jot $M`; do
+			wait
+		done
+	)
+done
+
+for i in `jot $N`; do
+	wait
+done
+rm -f inversion
+exit
+
+EOF
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void
+handler(int i)
+{
+	exit(0);
+}
+
+int
+main(int argc, char **argv)
+{
+
+	int t;
+	if (argc == 2)
+		t = atoi(argv[1]);
+	else
+		t = 60;
+	signal(SIGALRM, handler);
+	alarm(t);
+	for (;;)
+		;
+	return (0);
+}