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# $FreeBSD$ 29# 30 31# Regression test. This script caused this panic: 32 33# panic: lockmgr: locking against myself 34# cpuid = 2 35# KDB: enter: panic 36# [thread pid 2526 tid 100070 ] 37# Stopped at kdb_enter+0x2b: nop 38# db> bt 39# Tracing pid 2526 tid 100070 td 0xc46f8360 40# kdb_enter(c094247f) at kdb_enter+0x2b 41# panic(c09402b6,c46f8360,0,12,c06af5d9,...) at panic+0x14b 42# _lockmgr(d864a748,202122,c479f788,c46f8360,c094b01c,12d) at _lockmgr+0x41a 43# getblk(c479f6b8,5d51940,0,4000,0,...) at getblk+0x13c 44# breadn(c479f6b8,5d51940,0,4000,0,...) at breadn+0x2f 45# bread(c479f6b8,5d51940,0,4000,0,e6d13544,c4743eac,0,c095a185,56d) at bread+0x20 46# ffs_alloccg(c47408c4,104,1754628,0,4000,c4743eac,1,c095a185,4d8) at ffs_alloccg+0x11d 47# ffs_hashalloc(c47408c4,104,1754628,0,4000,...) at ffs_hashalloc+0x45 48# ffs_alloc(c47408c4,3f2cd,0,1754628,0,4000,c42fd400,e6d13674) at ffs_alloc+0x1a5 49# ffs_balloc_ufs2(c4735d70,fcb34000,0,4000,c42fd400,...) at ffs_balloc_ufs2+0x1619 50# ffs_copyonwrite(c479f6b8,d84e3d08) at ffs_copyonwrite+0x3d3 51# ffs_geom_strategy(c479f7c0,d84e3d08) at ffs_geom_strategy+0xbd 52# bufwrite(d84e3d08,4000,d84e3d08,e6d137e4,c070b7a9,...) at bufwrite+0x17a 53# ffs_bufwrite(d84e3d08) at ffs_bufwrite+0x282 54# vfs_bio_awrite(d84e3d08) at vfs_bio_awrite+0x235 55# bdwrite(d864a6e8,c4743eac,0,c095a185,57c,...) at bdwrite+0x237 56# ffs_alloccg(c4b54a50,104,1754628,0,4000,c4743eac,1,c095a185,4d8) at ffs_alloccg+0x1f6 57# ffs_hashalloc(c4b54a50,104,1754628,0,4000,...) at ffs_hashalloc+0x45 58# ffs_alloc(c4b54a50,1b00c,0,1754628,0,4000,c4b22a80,e6d139ac) at ffs_alloc+0x1a5 59# ffs_balloc_ufs2(c4e72158,6c030000,0,4000,c4b22a80,...) at ffs_balloc_ufs2+0x1619 60# ffs_write(e6d13b98) at ffs_write+0x2ac 61# VOP_WRITE_APV(c0a00e80,e6d13b98) at VOP_WRITE_APV+0x132 62# vn_write(c46c65a0,e6d13c60,c4b22a80,0,c46f8360) at vn_write+0x1f6 63# dofilewrite(c46f8360,4,c46c65a0,e6d13c60,ffffffff,...) at dofilewrite+0x77 64# kern_writev(c46f8360,4,e6d13c60,8430000,d0000,...) at kern_writev+0x36 65# write(c46f8360,e6d13d00) at write+0x45 66# syscall(e6d13d38) at syscall+0x256 67 68 69[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 70 71persist () { 72 false 73 while [ $? -ne 0 ]; do 74 $1 > /dev/null 2>&1 75 sleep 1 76 done 77} 78 79diskfree=`df -k /var/tmp | tail -1 | awk '{print $4}'` 80[ $((diskfree / 1024 / 1024)) -lt 5 ] && echo "Not enough disk space" && exit 1 81 82rm -f /var/.snap/pho /var/tmp/big.? 83trap "rm -f /var/.snap/pho /var/tmp/big.?" 0 84persist 'mksnap_ffs /var /var/.snap/pho' 85sysctl vfs.dirtybufthresh=10 > /dev/null 2>&1 86 87cd /var/tmp 88for j in `jot 10`; do 89 old=`sysctl vfs.altbufferflushes | awk '{print $NF}'` 90 for i in `jot 4`; do 91 echo "`date '+%T'` Create big.$i" 92 dd if=/dev/zero of=big.$i bs=1m count=4k 2>&1 | egrep -v "records|transferred" 93 done 94 sleep 1 95 rm -rf /var/tmp/big.? 96 new=`sysctl vfs.altbufferflushes | awk '{print $NF}'` 97 [ $new -ne $old ] && echo "vfs.altbufferflushes changed from $old to $new." 98done 99rm -f /var/.snap/pho 100