1#!/bin/sh 2 3# 4# Copyright (c) 2014 EMC Corp. 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 29# "panic: vm_map_protect: object 0xca6869c0 overcharged" seen: 30# http://people.freebsd.org/~pho/stress/log/mmap9.txt 31# Fixed in r265843 32 33# Test scenario by: Mark Johnston markj@ 34 35. ../default.cfg 36 37dir=/tmp 38odir=`pwd` 39cd $dir 40sed '1,/^EOF/d' < $odir/$0 > $dir/mmap9.c 41# At one point during the fix development, only the thread version would panic 42mycc -o mmap9 -O2 -Wall -Wextra mmap9.c || exit 1 43mycc -o mmap9p -O2 -Wall -Wextra mmap9.c -lpthread || exit 1 44rm -f mmap9.c 45cd $odir 46 47/tmp/mmap9 48/tmp/mmap9p 49 50rm -f /tmp/mmap9 /tmp/mmap9p 51exit 52 53EOF 54#include <sys/types.h> 55#include <sys/mman.h> 56 57#include <err.h> 58#include <string.h> 59#include <unistd.h> 60 61int 62main(void) 63{ 64 size_t sz = 1; 65 char *addr; 66 67/* 68 * This is the minimum amount of C code it takes to panic the kernel. 69 * This is as submitted and thus not a complete and correct test program. 70 */ 71 addr = mmap(NULL, sz, PROT_READ | PROT_WRITE, MAP_ANON, 72 -1, 0); 73 if (addr == NULL) 74 err(1, "mmap"); 75 memset(addr, 0, sz); 76 77 if (fork() != 0) { 78 if (mlock(addr, sz)) 79 err(1, "mlock"); 80 if (mprotect(addr, sz, PROT_READ)) 81 err(1, "mprotect"); 82 if (mprotect(addr, sz, PROT_READ | PROT_WRITE)) 83 err(1, "mprotect"); 84 if (mprotect(addr, sz, PROT_READ)) 85 err(1, "mprotect"); 86 if (mprotect(addr, sz, PROT_READ | PROT_WRITE)) 87 err(1, "mprotect"); 88 } else 89 /* 90 * Ensure that shadow objects aren't collapsed by process exit. 91 */ 92 sleep(1); 93 94 return (0); 95} 96