95 lines
2.6 KiB
Bash
Executable File
95 lines
2.6 KiB
Bash
Executable File
#!/bin/sh
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#
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# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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#
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# Copyright (c) 2021 Mark Johnston <markj@freebsd.org>
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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_fault_hold: fault on nofault entry, addr: 0x33522000' seen.
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# Fixed by 351262
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cat > /tmp/midi.c <<EOF
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#include <err.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <stdatomic.h>
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#include <stdlib.h>
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#include <unistd.h>
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#define NTHREADS 16
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static _Atomic(int) threads;
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static int fd;
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static void *
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t(void *data __unused)
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{
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char buf[4096];
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ssize_t n;
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off_t off;
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(void)atomic_fetch_add(&threads, 1);
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while (atomic_load(&threads) != NTHREADS)
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;
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for (;;) {
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arc4random_buf(&off, sizeof(off));
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if ((n = pread(fd, buf, sizeof(buf), off)) >= 0)
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write(STDOUT_FILENO, buf, n);
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}
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return (NULL);
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}
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int
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main(void)
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{
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pthread_t tid[NTHREADS];
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int error, i;
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fd = open("/dev/midistat", O_RDONLY);
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if (fd < 0)
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err(1, "open");
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for (i = 0; i < NTHREADS; i++)
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if ((error = pthread_create(&tid[i], NULL, t, NULL)) != 0)
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errc(1, error, "pthread_create");
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for (i = 0; i < NTHREADS; i++)
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if ((error = pthread_join(tid[i], NULL)) != 0)
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errc(1, error, "pthread_join");
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return (0);
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}
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EOF
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cc -o /tmp/midi -Wall -Wextra -O2 /tmp/midi.c -lpthread
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start=`date +%s`
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while [ $((`date +%s` - start)) -lt 120 ]; do
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timeout 10 /tmp/midi | strings | head -20
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done
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rm -f /tmp/midi /tmp/midi.c /tmp/midi.core
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exit 0
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