>Number: 162195
>Category: kern
>Synopsis: panic with soft updates journaling during umount -f
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Oct 31 11:30:11 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Kirk Russell
>Release: FreeBSD 9.0-RC1
>Organization:
bstg
>Environment:
FreeBSD kleenex 9.0-RC1 FreeBSD 9.0-RC1 #0: Sun Oct 30 15:34:30 GMT 2011
root@kleenex:/usr/obj/usr/src/sys/KLEENEX i386
>Description:
I have been testing a scratch filesystem, with soft updates journaling enabled.
During a test, if I run umount -f, I will see this panic:
panic: check_inode_unwritten: busy inode
Here is the source to the load test:
http://www.ba23.org/bstgbugs/bstg0004.sh
Here is the output from /var/crash/core.txt:
http://www.ba23.org/bstgbugs/bstg0004.core.txt.gz
kleenex# sh bstg0004.sh
/dev/ada0p4: 56320.0MB (115343360 sectors) block size 32768, fragment size 4096
using 77 cylinder groups of 740.00MB, 23680 blks, 47360 inodes.
with soft updates
super-block backups (for fsck -b #) at:
192, 1515712, 3031232, 4546752, 6062272, 7577792, 9093312, 10608832, 12124352,
13639872, 15155392, 16670912, 18186432, 19701952, 21217472, 22732992,
24248512, 25764032, 27279552, 28795072, 30310592, 31826112, 33341632,
34857152, 36372672, 37888192, 39403712, 40919232, 42434752, 43950272,
45465792, 46981312, 48496832, 50012352, 51527872, 53043392, 54558912,
56074432, 57589952, 59105472, 60620992, 62136512, 63652032, 65167552,
66683072, 68198592, 69714112, 71229632, 72745152, 74260672, 75776192,
77291712, 78807232, 80322752, 81838272, 83353792, 84869312, 86384832,
87900352, 89415872, 90931392, 92446912, 93962432, 95477952, 96993472,
98508992, 100024512, 101540032, 103055552, 104571072, 106086592, 107602112,
109117632, 110633152, 112148672, 113664192, 115179712
Using inode 4 in cg 0 for 33554432 byte journal
newfs: soft updates journaling set
Test started [fstorture 2.1-pfh]: Mon Oct 31 11:24:34 GMT 2011
Running for 3 seconds
panic: check_inode_unwritten: busy inode
cpuid = 0
KDB: enter: panic
[ thread pid 1383 tid 100058 ]
Stopped at kdb_enter+0x3a: movl $0,kdb_why
db>
>How-To-Repeat:
Change the variables to match your installation. Then run the script.
#!/bin/sh
#
# Copyright 2011 Kirk J. Russell
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Web page about FsTorture
# - http://fstools.macosforge.org/trac/wiki/FsTorture
#
# Port FsTorture to Freebsd
# - get source http://fstools.macosforge.org/trac/wiki/ToolsDevelopment
# - get membership.h http://www.ba23.org/~kirk/bstgbugs/membership.h
# - get patch http://www.ba23.org/~kirk/bstgbugs/fstorture.patch
# - gmake CFLAGS=-I. LDFLAGS="-lpthread -lm"
#
# Run this script and you will get a panic with FreeBSD 9.0-RC1
# panic: check_inode_unwritten: busy inode
#
# If you disable soft updates journaling, the panic will not happen.
#
fstorture=../fstorture/fstorture
# block special device used for testing
fsspec=/dev/ada0p4
# mount point used for filesystem testing
fsfile=/fubar
mkdir -p ${fsfile}
# run the test for less then 2 minutes
for tries in 1 2 3
do
for secs in 1 1 2 3 5 7 13
do
# Enable soft updates journaling
newfs -j ${fsspec}
mount ${fsspec} ${fsfile}
# run fstorture in the background
mkdir ${fsfile}/a ${fsfile}/b
timeout="$(printf "%d+2\n" ${secs} | bc)"
${fstorture} ${fsfile}/a ${fsfile}/b 25 -t ${timeout}s &
# block and then force the umount
sleep ${secs}
umount -f ${fsfile}
# clean up
killall fstorture fstorture fstorture
wait
done
done
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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