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#!/bin/sh
#
# Copyright (c) 2016 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.
#
# 'panic: vnode_pager_generic_getpages: page 0xc3350b0c offset beyond vp
# 0xcc187000 size' seen.
# https://people.freebsd.org/~pho/stress/log/mmap28.txt
# This was introduced by r292373.
#
# A page fault is seen on a non INVARIANTS kernel w/ r292373,
# whereas this test runs as expected on r292372.
# https://people.freebsd.org/~pho/stress/log/mmap28-2.txt
# https://people.freebsd.org/~pho/stress/log/mmap28-3.txt
# To repeat, run this test with "sysctl vfs.ffs.use_buf_pager=0".
# Fixed by r307626
# Test scenario refinement by kib@
. ../default.cfg
odir=`pwd`
cd /tmp
sed '1,/^EOF/d' < $odir/$0 > mmap28.c
mycc -o mmap28 -Wall -Wextra -g -O0 mmap28.c || exit 1
rm -f mmap28.c
cd $odir
(cd /tmp; ./mmap28)
rm -f /tmp/mmap28 /tmp/mmap28.0* /tmp/mmap28.core
exit 0
EOF
#include <sys/param.h>
#include <sys/mman.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#define ADRSPACE (256 * 1024 * 1024 )
#define STARTADDR 0x50000000U
static void
work(void)
{
size_t indx, left, len;
int fd, rfd;
int i;
char *p;
char path[128];
volatile char val __unused;
if ((rfd = open("/dev/random", O_RDONLY)) == -1)
err(1, "open(/dev/random)");
snprintf(path, sizeof(path), "/tmp/mmap28.%06d", 0);
if ((fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0640)) == -1)
err(1,"open(%s)", path);
p = (void *)STARTADDR + trunc_page(arc4random() % ADRSPACE);
left = ADRSPACE - (size_t)p + STARTADDR;
len = trunc_page(arc4random() % left) + PAGE_SIZE;
if (ftruncate(fd, len) == -1)
err(1, "ftruncate");
if ((p = mmap(p, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) ==
MAP_FAILED) {
if (errno == ENOMEM)
return;
err(1, "mmap()");
}
/*
Truncating the mapped file triggers a panic when accessed beyond
EOF.
*/
if (ftruncate(fd, len / 2) == -1)
err(1, "ftruncate(%s)", path);
for (i = 0; i < 1000; i++) {
if (read(rfd, &indx, sizeof(indx)) != sizeof(indx))
err(1, "read(random)");
val = p[indx % len];
}
close(rfd);
if (munmap(p, len) == -1)
err(1, "munmap(%p)", p);
close(fd);
unlink(path);
}
int
main(void)
{
work();
return (0);
}
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