121 lines
3.1 KiB
Bash
Executable File
121 lines
3.1 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2015 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: vm_page_unwire: page 0xc36cce48's wire count is zero" seen.
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# Fixed by r285878.
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# Test scenario by kib@:
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# 1. We mapped and mlocked the file.
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# 2. The file is truncated
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# 3. The file is extended again to cover the whole mapped area.
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# 4. The program accesses the mapping past the point of truncation.
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. ../default.cfg
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dir=/tmp
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odir=`pwd`
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cd $dir
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sed '1,/^EOF/d' < $odir/$0 > $dir/mmap25.c
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mycc -o mmap25 -Wall -Wextra mmap25.c || exit 1
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rm -f mmap25.c
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cd $odir
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cp /tmp/mmap25 /tmp/mmap25.inputfile
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daemon sh -c '(cd ../testcases/swap; ./swap -t 1m -i 2)' > \
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/dev/null 2>&1
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sleep 1
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/tmp/mmap25 /tmp/mmap25.inputfile
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while pgrep -q swap; do
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pkill -9 swap
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done
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rm -f /tmp/mmap25 /tmp/mmap25.inputfile mmap25.core
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exit
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EOF
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#include <sys/fcntl.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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const char *file;
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volatile char c;
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void
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test(void)
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{
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struct stat st;
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char *p;
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size_t len;
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off_t pos;
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int error, fd;
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if ((fd = open(file, O_RDWR)) == -1)
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err(1, "open %s", file);
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if ((error = fstat(fd, &st)) == -1)
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err(1, "stat(%s)", file);
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len = round_page(st.st_size);
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pos = len - getpagesize();
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if ((p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0))
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== MAP_FAILED)
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err(1, "mmap");
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if ((error = mlock(p, len)) == -1)
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err(1, "mlock");
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if (ftruncate(fd, pos) == -1)
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err(1, "ftruncate 1");
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if (ftruncate(fd, len) == -1)
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err(1, "ftruncate 2");
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c = p[pos]; /* Program received signal SIGSEGV, Segmentation fault. */
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if (munmap(p, len) == -1)
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err(1, "unmap()");
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close(fd);
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}
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int
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main(int argc, char *argv[])
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{
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if (argc != 2)
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errx(1, "Usage: %s <file>", argv[0]);
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file = argv[1];
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test();
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return (0);
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}
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