1#!/bin/sh 2 3# 4# Copyright (c) 2008 Peter Holm <pho@FreeBSD.org> 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28# $FreeBSD$ 29# 30 31# Provokes a deadlock by lower priority process holding a lock and 32# never beeing run 33 34dir=/tmp 35N=5 # Number of CPUs + 1 36M=25 # Number of lower priority jobs 37 38odir=`pwd` 39cd $dir 40sed '1,/^EOF/d' < $odir/$0 > $dir/inversion.c 41cc -o inversion -Wall inversion.c 42rm -f inversion.c 43 44for i in `jot $N`; do 45 ./inversion 3700& 46done 47 48while pgrep inversion > /dev/null; do 49 date '+%T' 50 ( 51 for i in `jot $M`; do 52 nice -n 20 lockf -s -t 0 .lock pwd > /dev/null & 53 done 54 for i in `jot $M`; do 55 wait 56 done 57 ) 58done 59 60for i in `jot $N`; do 61 wait 62done 63rm -f inversion 64exit 65 66EOF 67#include <signal.h> 68#include <stdlib.h> 69#include <unistd.h> 70 71void 72handler(int i) 73{ 74 exit(0); 75} 76 77int 78main(int argc, char **argv) 79{ 80 81 int t; 82 if (argc == 2) 83 t = atoi(argv[1]); 84 else 85 t = 60; 86 signal(SIGALRM, handler); 87 alarm(t); 88 for (;;) 89 ; 90 return (0); 91} 92