132 lines
3.4 KiB
Bash
Executable File
132 lines
3.4 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2016 EMC Corp.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# 'panic: vnode_pager_generic_getpages: page 0xc3350b0c offset beyond vp
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# 0xcc187000 size' seen.
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# https://people.freebsd.org/~pho/stress/log/mmap28.txt
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# This was introduced by r292373.
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#
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# A page fault is seen on a non INVARIANTS kernel w/ r292373,
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# whereas this test runs as expected on r292372.
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# https://people.freebsd.org/~pho/stress/log/mmap28-2.txt
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# https://people.freebsd.org/~pho/stress/log/mmap28-3.txt
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# To repeat, run this test with "sysctl vfs.ffs.use_buf_pager=0".
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# Fixed by r307626
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# Test scenario refinement by kib@
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. ../default.cfg
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odir=`pwd`
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cd /tmp
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sed '1,/^EOF/d' < $odir/$0 > mmap28.c
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mycc -o mmap28 -Wall -Wextra -g -O0 mmap28.c || exit 1
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rm -f mmap28.c
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cd $odir
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(cd /tmp; ./mmap28)
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rm -f /tmp/mmap28 /tmp/mmap28.0* /tmp/mmap28.core
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exit 0
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EOF
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#define ADRSPACE (256 * 1024 * 1024 )
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#define STARTADDR 0x50000000U
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static void
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work(void)
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{
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size_t indx, left, len;
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int fd, rfd;
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int i;
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char *p;
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char path[128];
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volatile char val __unused;
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if ((rfd = open("/dev/random", O_RDONLY)) == -1)
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err(1, "open(/dev/random)");
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snprintf(path, sizeof(path), "/tmp/mmap28.%06d", 0);
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if ((fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0640)) == -1)
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err(1,"open(%s)", path);
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p = (void *)STARTADDR + trunc_page(arc4random() % ADRSPACE);
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left = ADRSPACE - (size_t)p + STARTADDR;
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len = trunc_page(arc4random() % left) + PAGE_SIZE;
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if (ftruncate(fd, len) == -1)
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err(1, "ftruncate");
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if ((p = mmap(p, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) ==
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MAP_FAILED) {
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if (errno == ENOMEM)
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return;
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err(1, "mmap()");
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}
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/*
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Truncating the mapped file triggers a panic when accessed beyond
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EOF.
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*/
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if (ftruncate(fd, len / 2) == -1)
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err(1, "ftruncate(%s)", path);
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for (i = 0; i < 1000; i++) {
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if (read(rfd, &indx, sizeof(indx)) != sizeof(indx))
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err(1, "read(random)");
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val = p[indx % len];
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}
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close(rfd);
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if (munmap(p, len) == -1)
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err(1, "munmap(%p)", p);
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close(fd);
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unlink(path);
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}
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int
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main(void)
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{
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work();
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return (0);
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}
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