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# Regression test. This script caused this panic: 30 31# panic: lockmgr: locking against myself 32# cpuid = 2 33# KDB: enter: panic 34# [thread pid 2526 tid 100070 ] 35# Stopped at kdb_enter+0x2b: nop 36# db> bt 37# Tracing pid 2526 tid 100070 td 0xc46f8360 38# kdb_enter(c094247f) at kdb_enter+0x2b 39# panic(c09402b6,c46f8360,0,12,c06af5d9,...) at panic+0x14b 40# _lockmgr(d864a748,202122,c479f788,c46f8360,c094b01c,12d) at _lockmgr+0x41a 41# getblk(c479f6b8,5d51940,0,4000,0,...) at getblk+0x13c 42# breadn(c479f6b8,5d51940,0,4000,0,...) at breadn+0x2f 43# bread(c479f6b8,5d51940,0,4000,0,e6d13544,c4743eac,0,c095a185,56d) at bread+0x20 44# ffs_alloccg(c47408c4,104,1754628,0,4000,c4743eac,1,c095a185,4d8) at ffs_alloccg+0x11d 45# ffs_hashalloc(c47408c4,104,1754628,0,4000,...) at ffs_hashalloc+0x45 46# ffs_alloc(c47408c4,3f2cd,0,1754628,0,4000,c42fd400,e6d13674) at ffs_alloc+0x1a5 47# ffs_balloc_ufs2(c4735d70,fcb34000,0,4000,c42fd400,...) at ffs_balloc_ufs2+0x1619 48# ffs_copyonwrite(c479f6b8,d84e3d08) at ffs_copyonwrite+0x3d3 49# ffs_geom_strategy(c479f7c0,d84e3d08) at ffs_geom_strategy+0xbd 50# bufwrite(d84e3d08,4000,d84e3d08,e6d137e4,c070b7a9,...) at bufwrite+0x17a 51# ffs_bufwrite(d84e3d08) at ffs_bufwrite+0x282 52# vfs_bio_awrite(d84e3d08) at vfs_bio_awrite+0x235 53# bdwrite(d864a6e8,c4743eac,0,c095a185,57c,...) at bdwrite+0x237 54# ffs_alloccg(c4b54a50,104,1754628,0,4000,c4743eac,1,c095a185,4d8) at ffs_alloccg+0x1f6 55# ffs_hashalloc(c4b54a50,104,1754628,0,4000,...) at ffs_hashalloc+0x45 56# ffs_alloc(c4b54a50,1b00c,0,1754628,0,4000,c4b22a80,e6d139ac) at ffs_alloc+0x1a5 57# ffs_balloc_ufs2(c4e72158,6c030000,0,4000,c4b22a80,...) at ffs_balloc_ufs2+0x1619 58# ffs_write(e6d13b98) at ffs_write+0x2ac 59# VOP_WRITE_APV(c0a00e80,e6d13b98) at VOP_WRITE_APV+0x132 60# vn_write(c46c65a0,e6d13c60,c4b22a80,0,c46f8360) at vn_write+0x1f6 61# dofilewrite(c46f8360,4,c46c65a0,e6d13c60,ffffffff,...) at dofilewrite+0x77 62# kern_writev(c46f8360,4,e6d13c60,8430000,d0000,...) at kern_writev+0x36 63# write(c46f8360,e6d13d00) at write+0x45 64# syscall(e6d13d38) at syscall+0x256 65 66[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 67 68persist () { 69 false 70 while [ $? -ne 0 ]; do 71 $1 > /dev/null 2>&1 72 sleep 1 73 done 74} 75 76diskfree=`df -k /var/tmp | tail -1 | awk '{print $4}'` 77[ $((diskfree / 1024 / 1024)) -lt 5 ] && echo "Not enough disk space" && exit 1 78 79rm -f /var/.snap/stress2 /var/tmp/big.? 80trap "rm -f /var/.snap/stress2 /var/tmp/big.?" EXIT INT 81persist 'mksnap_ffs /var /var/.snap/stress2' 82tresh=`sysctl vfs.dirtybufthresh | awk '{print $NF}'` 83sysctl vfs.dirtybufthresh=10 84 85cd /var/tmp 86for j in `jot 5`; do 87 old=`sysctl vfs.altbufferflushes | awk '{print $NF}'` 88 for i in `jot 4`; do 89 echo "`date '+%T'` Create big.$i" 90 dd if=/dev/zero of=big.$i bs=1m count=4k status=none 91 done 92 sleep 1 93 rm -rf /var/tmp/big.? 94 new=`sysctl vfs.altbufferflushes | awk '{print $NF}'` 95 [ $new -ne $old ] && echo "vfs.altbufferflushes changed from $old to $new." 96done 97sysctl vfs.dirtybufthresh=$tresh 98rm -f /var/.snap/stress2 99