1#!/bin/sh 2 3# 4# Copyright (c) 2008 Peter Holm <pho@FreeBSD.org> 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29# Alternate buffer flush path test (Not verified). 30# Regression test for r169006. 31# Apply this patch to amplify the problem: 32# 33# diff -r1.520 vfs_bio.c 34# 894c894 35# < if (bo->bo_dirty.bv_cnt > dirtybufthresh + 10) { 36# --- 37# > if (bo->bo_dirty.bv_cnt > dirtybufthresh /*+ 10*/) { 38 39. ../default.cfg 40 41odir=`pwd` 42dir=$RUNDIR/alternativeFlushPath 43 44[ -d $dir ] && find $dir -type f | xargs rm 45rm -rf $dir 46mkdir -p $dir 47cd $dir 48sed '1,/^EOF/d' < $odir/$0 > $dir/alternativeFlushPath.c 49mycc -o /tmp/alternativeFlushPath -Wall -Wextra alternativeFlushPath.c || 50 exit 1 51rm -f alternativeFlushPath.c 52 53for j in `jot 10`; do 54 /tmp/alternativeFlushPath & 55done 56wait 57sysctl vfs.altbufferflushes 58 59cd $odir 60rm -rf /tmp/alternativeFlushPath $dir 61 62exit 63 64EOF 65#include <stdio.h> 66#include <unistd.h> 67#include <stdlib.h> 68#include <fcntl.h> 69#include <sys/signal.h> 70#include <sys/types.h> 71#include <sys/time.h> 72#include <sys/resource.h> 73#include <err.h> 74 75#define MAXNOFILE 500000 /* To limit runtime */ 76 77static volatile sig_atomic_t more; 78 79static void 80handler(int i __unused) { 81 more = 0; 82} 83 84void 85test(void) 86{ 87 int i, j; 88 char name[80]; 89 pid_t mypid; 90 int *fd; 91 struct rlimit rlp; 92 93 if (getrlimit(RLIMIT_NOFILE, &rlp) == -1) 94 err(1, "getrlimit(RLIMIT_NOFILE)"); 95 if (rlp.rlim_cur > MAXNOFILE) 96 rlp.rlim_cur = MAXNOFILE; 97 rlp.rlim_cur /= 10; 98 mypid = getpid(); 99 fd = malloc(rlp.rlim_cur * sizeof(int)); 100 101 for (i = 0, j = 0; i < rlp.rlim_cur && more == 1; i++, j++) { 102 sprintf(name, "f%05d.%05d", mypid, i); 103 if ((fd[i] = open(name, O_CREAT|O_WRONLY, 0666)) == -1) { 104 warn("open(%s)", name); 105 more = 0; 106 break; 107 } 108 } 109 for (i = 0; i < j; i++) { 110 sprintf(name, "f%05d.%05d", mypid, i); 111 if (unlink(name) == -1) 112 warn("unlink(%s)", name); 113 } 114 for (i = 0; i < j; i++) { 115 if (close(fd[i]) == -1) 116 warn("close(%d)", i); 117 } 118 free(fd); 119} 120 121int 122main() 123{ 124 more = 1; 125 signal(SIGALRM, handler); 126 alarm(20 * 60); 127 while (more == 1) 128 test(); 129 130 return(0); 131} 132