1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause 5# 6# Copyright (c) 2021 Mark Johnston <markj@freebsd.org> 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions 10# are met: 11# 1. Redistributions of source code must retain the above copyright 12# notice, this list of conditions and the following disclaimer. 13# 2. Redistributions in binary form must reproduce the above copyright 14# notice, this list of conditions and the following disclaimer in the 15# documentation and/or other materials provided with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27# SUCH DAMAGE. 28# 29 30# 'panic: vm_fault_hold: fault on nofault entry, addr: 0x33522000' seen. 31# Fixed by 351262 32 33cat > /tmp/midi.c <<EOF 34#include <err.h> 35#include <fcntl.h> 36#include <pthread.h> 37#include <stdatomic.h> 38#include <stdlib.h> 39#include <unistd.h> 40 41#define NTHREADS 16 42 43static _Atomic(int) threads; 44static int fd; 45 46static void * 47t(void *data __unused) 48{ 49 char buf[4096]; 50 ssize_t n; 51 off_t off; 52 53 (void)atomic_fetch_add(&threads, 1); 54 while (atomic_load(&threads) != NTHREADS) 55 ; 56 57 for (;;) { 58 arc4random_buf(&off, sizeof(off)); 59 if ((n = pread(fd, buf, sizeof(buf), off)) >= 0) 60 write(STDOUT_FILENO, buf, n); 61 } 62 63 return (NULL); 64} 65 66int 67main(void) 68{ 69 pthread_t tid[NTHREADS]; 70 int error, i; 71 72 fd = open("/dev/midistat", O_RDONLY); 73 if (fd < 0) 74 err(1, "open"); 75 76 for (i = 0; i < NTHREADS; i++) 77 if ((error = pthread_create(&tid[i], NULL, t, NULL)) != 0) 78 errc(1, error, "pthread_create"); 79 for (i = 0; i < NTHREADS; i++) 80 if ((error = pthread_join(tid[i], NULL)) != 0) 81 errc(1, error, "pthread_join"); 82 83 return (0); 84} 85EOF 86cc -o /tmp/midi -Wall -Wextra -O2 /tmp/midi.c -lpthread 87 88start=`date +%s` 89while [ $((`date +%s` - start)) -lt 120 ]; do 90 timeout 10 /tmp/midi | strings | head -20 91done 92 93rm -f /tmp/midi /tmp/midi.c /tmp/midi.core 94exit 0 95