1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause 5# 6# Copyright (c) 2020 Peter Holm <pho@FreeBSD.org> 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions 10# are met: 11# 1. Redistributions of source code must retain the above copyright 12# notice, this list of conditions and the following disclaimer. 13# 2. Redistributions in binary form must reproduce the above copyright 14# notice, this list of conditions and the following disclaimer in the 15# documentation and/or other materials provided with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27# SUCH DAMAGE. 28# 29 30# Attempt to reproduce 31# "panic: pmap_release: pmap 0xfffffe012fb61b08 resident count 1 != 0" 32# No problems seen. 33 34# Test scenario suggestion by kib@ 35 36. ../default.cfg 37[ `id -u` -ne 0 ] && echo "Must be root!" && exit 1 38[ `uname -p` != "amd64" ] && exit 0 39 40dir=/tmp 41odir=`pwd` 42cd $dir 43sed '1,/^EOF/d' < $odir/$0 > $dir/mmap39.c 44mycc -o mmap39 -Wall -Wextra -O0 -g mmap39.c -static || exit 1 45rm -f mmap39.c 46cd $odir 47 48set -e 49mount | grep "on $mntpoint " | grep -q /dev/md && umount -f $mntpoint 50[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart 51mdconfig -a -t swap -s 2g -u $mdstart 52newfs $newfs_flags md$mdstart > /dev/null 53mount /dev/md$mdstart $mntpoint 54set +e 55 56for i in `jot 128`; do 57 proccontrol -m aslr -s disable $dir/mmap39 & 58 pids="$pids $!" 59done 60s=0 61for pid in $pids; do 62 wait $pid 63 r=$? 64 [ $s -ne 0 ] && s=$r 65done 66 67[ -f mmap39.core -a $s -eq 0 ] && 68 { ls -l mmap39.core; mv mmap39.core $dir; s=1; } 69cd $odir 70 71for i in `jot 6`; do 72 mount | grep -q "on $mntpoint " || break 73 umount $mntpoint && break || sleep 10 74 [ $i -eq 6 ] && 75 { echo FATAL; fstat -mf $mntpoint; exit 1; } 76done 77mdconfig -d -u $mdstart 78rm -rf $dir/mmap39 79exit $s 80 81EOF 82#include <sys/param.h> 83#include <sys/mman.h> 84#include <sys/wait.h> 85 86#include <err.h> 87#include <stdio.h> 88#include <time.h> 89#include <unistd.h> 90 91void 92test(void) 93{ 94 size_t i, len; 95 void *p; 96 97 p = (void *)0x8000000000; /* 512G */ 98 len = 0x200000; /* 2M */ 99 if ((p = mmap(p, len, PROT_READ | PROT_WRITE, MAP_ANON, -1, 0)) == 100 MAP_FAILED) 101 err(1, "mmap"); 102 103 if (p != (void *)0x8000000000) 104 errx(1, "mmap address fail"); 105 106 for (i = 0; i < len; i += PAGE_SIZE) 107 *(char *)(p + i) = 1; 108 109 if (munmap(p, len) == -1) 110 err(1, "munmap()"); 111 112 _exit(0); 113} 114 115int 116main(void) 117{ 118 time_t start; 119 pid_t pid; 120 121 sleep(5); 122 start = time(NULL); 123 while (time(NULL) - start < 120) { 124 if ((pid = fork()) == 0) 125 test(); 126 if (waitpid(pid, NULL, 0) != pid) 127 err(1, "waitpid"); 128 } 129 130 return (0); 131} 132