xfs/288: test fragmented multi-fsb readdir

Commit Message

Eric Sandeen April 13, 2017, 8:28 p.m. UTC

Test for the patch I just sent to the xfs list,
xfs: handle array index overrun in xfs_dir2_leaf_readbuf()

Signed-off-by: Eric Sandeen <[e-mail]>
---

the .out file is very big; We could probably live without
it, since the test is just looking for a hang or a KASAN
splat.


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Comments

Darrick J. Wong April 13, 2017, 10:34 p.m. UTC | #1

On Thu, Apr 13, 2017 at 03:28:02PM -0500, Eric Sandeen wrote:
> Test for the patch I just sent to the xfs list,
> xfs: handle array index overrun in xfs_dir2_leaf_readbuf()
> 
> Signed-off-by: Eric Sandeen <[e-mail]>
> ---
> 
> the .out file is very big; We could probably live without
> it, since the test is just looking for a hang or a KASAN
> splat.
> 
> diff --git a/tests/xfs/288 b/tests/xfs/288
> new file mode 100755
> index 0000000..537b45b
> --- /dev/null
> +++ b/tests/xfs/288
> @@ -0,0 +1,119 @@
> +#! /bin/bash
> +# FS QA Test 288
> +#
> +# Test readdir on fragmented multi-fsb dir blocks
> +#
> +# If the readahead map ends with a partial multi-fsb dir
> +# block, the loop at the end of xfs_dir2_leaf_readbuf() may
> +# walk off the end of the mapping array, read garbage,
> +# corrupt the loop control counter, and never return.
> +#
> +# Failure is a hang; KASAN should also catch this.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2017 Red Hat, Inc.  All Rights Reserved.
> +# Author: Eric Sandeen <[e-mail]>
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program; if not, write the Free Software Foundation,
> +# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> +#-----------------------------------------------------------------------
> +#
> +
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +	cd /
> +	rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs xfs
> +_supported_os Linux
> +_require_scratch
> +_require_test_program "punch-alternating"
> +
> +# We want to override mkfs with a very specific geometry
> +$MKFS_XFS_PROG -f -d size=512m -n size=8192 -i size=1024 $SCRATCH_DEV  \
> +	> $seqres.full 2>&1 || _fail "mkfs failed"
> +
> +_scratch_mount
> +
> +# Make a ton of mostly-empty inode clusters so we can always
> +# make more inodes
> +mkdir $SCRATCH_MNT/tmp
> +for I in `seq 1 10000`; do touch $SCRATCH_MNT/tmp/$I; done
> +
> +# These mostly-empty clusters will live here:
> +mkdir $SCRATCH_MNT/clusters
> +for I in `seq 1 32 10000`; do
> +	mv $SCRATCH_MNT/tmp/$I $SCRATCH_MNT/clusters;
> +done
> +rm -rf $SCRATCH_MNT/tmp
> +
> +# Make our test dir with a couple blocks, should be contiguous
> +mkdir $SCRATCH_MNT/testdir
> +# roughly 20 chars per file
> +for I in `seq 1 100`; do
> +	touch $SCRATCH_MNT/testdir/12345678901234567890$I;
> +done
> +
> +# Now completely fragment freespace.
> +# Consume most of it:
> +xfs_io -f -c "falloc 0 400m" $SCRATCH_MNT/fillfile ||
> +	_fail "Could not allocate space"
> +
> +# File to fragment:
> +xfs_io -f -c "falloc 0 70m" $SCRATCH_MNT/fragfile ||
> +	_fail "Could not allocate space"
> +
> +df -h $SCRATCH_MNT > $seqres.full 2>&1

Truncates $seqres.full...

> +
> +# Fill remaining space; let this run to failure
> +dd if=/dev/zero of=$SCRATCH_MNT/spacefile1 oflag=direct > $seqres.full 2>&1

Truncates $seqres.full...

> +# Fragment our all-consuming file
> +./src/punch-alternating $SCRATCH_MNT/fragfile > $seqres.full 2>&1

Trunca...oh never mind. :)

> +
> +# Punching might have freed up large-ish swaths of metadata
> +# Consume hopefully any remaining contiguous freespace
> +# (and then some for good measure)
> +dd if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64 > $seqres.full 2>&1
> +xfs_io -c fsync $SCRATCH_MNT/spacefile2 > $seqres.full 2>&1

dd conv=fsync?

> +
> +# Now populate the directory so that it must allocate these
> +# fragmented blocks
> +for I in `seq 1 1400`;
> +	do touch $SCRATCH_MNT/testdir/12345678901234567890$I;
> +done
> +
> +# Now traverse that ugly thing!
> +find $SCRATCH_MNT/testdir

Spews ~1400 unfiltered scratch_mnt paths into the golden output...
...if you're looking for a hang or dmesg splat, there are ways to detect
those.

> +
> +status=0
> +exit
> diff --git a/tests/xfs/288.out b/tests/xfs/288.out
> new file mode 100644
> index 0000000..38b0e8c
> --- /dev/null
> +++ b/tests/xfs/288.out
> @@ -0,0 +1,1402 @@
> +QA output created by 288
> +/mnt/scratch/testdir
> +/mnt/scratch/testdir/123456789012345678901
> +/mnt/scratch/testdir/123456789012345678902
> +/mnt/scratch/testdir/123456789012345678903
> +/mnt/scratch/testdir/123456789012345678904
> +/mnt/scratch/testdir/123456789012345678905
> +/mnt/scratch/testdir/123456789012345678906
> +/mnt/scratch/testdir/123456789012345678907
> +/mnt/scratch/testdir/123456789012345678908
> +/mnt/scratch/testdir/123456789012345678909
> +/mnt/scratch/testdir/1234567890123456789010
> +/mnt/scratch/testdir/1234567890123456789011
> +/mnt/scratch/testdir/1234567890123456789012
> +/mnt/scratch/testdir/1234567890123456789013
> +/mnt/scratch/testdir/1234567890123456789014
> +/mnt/scratch/testdir/1234567890123456789015
> +/mnt/scratch/testdir/1234567890123456789016
> +/mnt/scratch/testdir/1234567890123456789017
> +/mnt/scratch/testdir/1234567890123456789018
> +/mnt/scratch/testdir/1234567890123456789019
> +/mnt/scratch/testdir/1234567890123456789020
> +/mnt/scratch/testdir/1234567890123456789021
> +/mnt/scratch/testdir/1234567890123456789022
> +/mnt/scratch/testdir/1234567890123456789023
> +/mnt/scratch/testdir/1234567890123456789024
> +/mnt/scratch/testdir/1234567890123456789025
> +/mnt/scratch/testdir/1234567890123456789026
> +/mnt/scratch/testdir/1234567890123456789027
> +/mnt/scratch/testdir/1234567890123456789028
> +/mnt/scratch/testdir/1234567890123456789029
> +/mnt/scratch/testdir/1234567890123456789030
> +/mnt/scratch/testdir/1234567890123456789031
> +/mnt/scratch/testdir/1234567890123456789032
> +/mnt/scratch/testdir/1234567890123456789033
> +/mnt/scratch/testdir/1234567890123456789034
> +/mnt/scratch/testdir/1234567890123456789035
> +/mnt/scratch/testdir/1234567890123456789036
> +/mnt/scratch/testdir/1234567890123456789037
> +/mnt/scratch/testdir/1234567890123456789038
> +/mnt/scratch/testdir/1234567890123456789039
> +/mnt/scratch/testdir/1234567890123456789040
> +/mnt/scratch/testdir/1234567890123456789041
> +/mnt/scratch/testdir/1234567890123456789042
> +/mnt/scratch/testdir/1234567890123456789043
> +/mnt/scratch/testdir/1234567890123456789044
> +/mnt/scratch/testdir/1234567890123456789045
> +/mnt/scratch/testdir/1234567890123456789046
> +/mnt/scratch/testdir/1234567890123456789047
> +/mnt/scratch/testdir/1234567890123456789048
> +/mnt/scratch/testdir/1234567890123456789049
> +/mnt/scratch/testdir/1234567890123456789050
> +/mnt/scratch/testdir/1234567890123456789051
> +/mnt/scratch/testdir/1234567890123456789052
> +/mnt/scratch/testdir/1234567890123456789053
> +/mnt/scratch/testdir/1234567890123456789054
> +/mnt/scratch/testdir/1234567890123456789055
> +/mnt/scratch/testdir/1234567890123456789056
> +/mnt/scratch/testdir/1234567890123456789057
> +/mnt/scratch/testdir/1234567890123456789058
> +/mnt/scratch/testdir/1234567890123456789059
> +/mnt/scratch/testdir/1234567890123456789060
> +/mnt/scratch/testdir/1234567890123456789061
> +/mnt/scratch/testdir/1234567890123456789062
> +/mnt/scratch/testdir/1234567890123456789063
> +/mnt/scratch/testdir/1234567890123456789064
> +/mnt/scratch/testdir/1234567890123456789065
> +/mnt/scratch/testdir/1234567890123456789066
> +/mnt/scratch/testdir/1234567890123456789067
> +/mnt/scratch/testdir/1234567890123456789068
> +/mnt/scratch/testdir/1234567890123456789069
> +/mnt/scratch/testdir/1234567890123456789070
> +/mnt/scratch/testdir/1234567890123456789071
> +/mnt/scratch/testdir/1234567890123456789072
> +/mnt/scratch/testdir/1234567890123456789073
> +/mnt/scratch/testdir/1234567890123456789074
> +/mnt/scratch/testdir/1234567890123456789075
> +/mnt/scratch/testdir/1234567890123456789076
> +/mnt/scratch/testdir/1234567890123456789077
> +/mnt/scratch/testdir/1234567890123456789078
> +/mnt/scratch/testdir/1234567890123456789079
> +/mnt/scratch/testdir/1234567890123456789080
> +/mnt/scratch/testdir/1234567890123456789081
> +/mnt/scratch/testdir/1234567890123456789082
> +/mnt/scratch/testdir/1234567890123456789083
> +/mnt/scratch/testdir/1234567890123456789084
> +/mnt/scratch/testdir/1234567890123456789085
> +/mnt/scratch/testdir/1234567890123456789086
> +/mnt/scratch/testdir/1234567890123456789087
> +/mnt/scratch/testdir/1234567890123456789088
> +/mnt/scratch/testdir/1234567890123456789089
> +/mnt/scratch/testdir/1234567890123456789090
> +/mnt/scratch/testdir/1234567890123456789091
> +/mnt/scratch/testdir/1234567890123456789092
> +/mnt/scratch/testdir/1234567890123456789093
> +/mnt/scratch/testdir/1234567890123456789094
> +/mnt/scratch/testdir/1234567890123456789095
> +/mnt/scratch/testdir/1234567890123456789096
> +/mnt/scratch/testdir/1234567890123456789097
> +/mnt/scratch/testdir/1234567890123456789098
> +/mnt/scratch/testdir/1234567890123456789099
> +/mnt/scratch/testdir/12345678901234567890100
> +/mnt/scratch/testdir/12345678901234567890101
> +/mnt/scratch/testdir/12345678901234567890102
> +/mnt/scratch/testdir/12345678901234567890103
> +/mnt/scratch/testdir/12345678901234567890104
> +/mnt/scratch/testdir/12345678901234567890105
> +/mnt/scratch/testdir/12345678901234567890106
> +/mnt/scratch/testdir/12345678901234567890107
> +/mnt/scratch/testdir/12345678901234567890108
> +/mnt/scratch/testdir/12345678901234567890109
> +/mnt/scratch/testdir/12345678901234567890110
> +/mnt/scratch/testdir/12345678901234567890111
> +/mnt/scratch/testdir/12345678901234567890112
> +/mnt/scratch/testdir/12345678901234567890113
> +/mnt/scratch/testdir/12345678901234567890114
> +/mnt/scratch/testdir/12345678901234567890115
> +/mnt/scratch/testdir/12345678901234567890116
> +/mnt/scratch/testdir/12345678901234567890117
> +/mnt/scratch/testdir/12345678901234567890118
> +/mnt/scratch/testdir/12345678901234567890119
> +/mnt/scratch/testdir/12345678901234567890120
> +/mnt/scratch/testdir/12345678901234567890121
> +/mnt/scratch/testdir/12345678901234567890122
> +/mnt/scratch/testdir/12345678901234567890123
> +/mnt/scratch/testdir/12345678901234567890124
> +/mnt/scratch/testdir/12345678901234567890125
> +/mnt/scratch/testdir/12345678901234567890126
> +/mnt/scratch/testdir/12345678901234567890127
> +/mnt/scratch/testdir/12345678901234567890128
> +/mnt/scratch/testdir/12345678901234567890129
> +/mnt/scratch/testdir/12345678901234567890130
> +/mnt/scratch/testdir/12345678901234567890131
> +/mnt/scratch/testdir/12345678901234567890132
> +/mnt/scratch/testdir/12345678901234567890133
> +/mnt/scratch/testdir/12345678901234567890134
> +/mnt/scratch/testdir/12345678901234567890135
> +/mnt/scratch/testdir/12345678901234567890136
> +/mnt/scratch/testdir/12345678901234567890137
> +/mnt/scratch/testdir/12345678901234567890138
> +/mnt/scratch/testdir/12345678901234567890139
> +/mnt/scratch/testdir/12345678901234567890140
> +/mnt/scratch/testdir/12345678901234567890141
> +/mnt/scratch/testdir/12345678901234567890142
> +/mnt/scratch/testdir/12345678901234567890143
> +/mnt/scratch/testdir/12345678901234567890144
> +/mnt/scratch/testdir/12345678901234567890145
> +/mnt/scratch/testdir/12345678901234567890146
> +/mnt/scratch/testdir/12345678901234567890147
> +/mnt/scratch/testdir/12345678901234567890148
> +/mnt/scratch/testdir/12345678901234567890149
> +/mnt/scratch/testdir/12345678901234567890150
> +/mnt/scratch/testdir/12345678901234567890151
> +/mnt/scratch/testdir/12345678901234567890152
> +/mnt/scratch/testdir/12345678901234567890153
> +/mnt/scratch/testdir/12345678901234567890154
> +/mnt/scratch/testdir/12345678901234567890155
> +/mnt/scratch/testdir/12345678901234567890156
> +/mnt/scratch/testdir/12345678901234567890157
> +/mnt/scratch/testdir/12345678901234567890158
> +/mnt/scratch/testdir/12345678901234567890159
> +/mnt/scratch/testdir/12345678901234567890160
> +/mnt/scratch/testdir/12345678901234567890161
> +/mnt/scratch/testdir/12345678901234567890162
> +/mnt/scratch/testdir/12345678901234567890163
> +/mnt/scratch/testdir/12345678901234567890164
> +/mnt/scratch/testdir/12345678901234567890165
> +/mnt/scratch/testdir/12345678901234567890166
> +/mnt/scratch/testdir/12345678901234567890167
> +/mnt/scratch/testdir/12345678901234567890168
> +/mnt/scratch/testdir/12345678901234567890169
> +/mnt/scratch/testdir/12345678901234567890170
> +/mnt/scratch/testdir/12345678901234567890171
> +/mnt/scratch/testdir/12345678901234567890172
> +/mnt/scratch/testdir/12345678901234567890173
> +/mnt/scratch/testdir/12345678901234567890174
> +/mnt/scratch/testdir/12345678901234567890175
> +/mnt/scratch/testdir/12345678901234567890176
> +/mnt/scratch/testdir/12345678901234567890177
> +/mnt/scratch/testdir/12345678901234567890178
> +/mnt/scratch/testdir/12345678901234567890179
> +/mnt/scratch/testdir/12345678901234567890180
> +/mnt/scratch/testdir/12345678901234567890181
> +/mnt/scratch/testdir/12345678901234567890182
> +/mnt/scratch/testdir/12345678901234567890183
> +/mnt/scratch/testdir/12345678901234567890184
> +/mnt/scratch/testdir/12345678901234567890185
> +/mnt/scratch/testdir/12345678901234567890186
> +/mnt/scratch/testdir/12345678901234567890187
> +/mnt/scratch/testdir/12345678901234567890188
> +/mnt/scratch/testdir/12345678901234567890189
> +/mnt/scratch/testdir/12345678901234567890190
> +/mnt/scratch/testdir/12345678901234567890191
> +/mnt/scratch/testdir/12345678901234567890192
> +/mnt/scratch/testdir/12345678901234567890193
> +/mnt/scratch/testdir/12345678901234567890194
> +/mnt/scratch/testdir/12345678901234567890195
> +/mnt/scratch/testdir/12345678901234567890196
> +/mnt/scratch/testdir/12345678901234567890197
> +/mnt/scratch/testdir/12345678901234567890198
> +/mnt/scratch/testdir/12345678901234567890199
> +/mnt/scratch/testdir/12345678901234567890200
> +/mnt/scratch/testdir/12345678901234567890201
> +/mnt/scratch/testdir/12345678901234567890202
> +/mnt/scratch/testdir/12345678901234567890203
> +/mnt/scratch/testdir/12345678901234567890204
> +/mnt/scratch/testdir/12345678901234567890205
> +/mnt/scratch/testdir/12345678901234567890206
> +/mnt/scratch/testdir/12345678901234567890207
> +/mnt/scratch/testdir/12345678901234567890208
> +/mnt/scratch/testdir/12345678901234567890209
> +/mnt/scratch/testdir/12345678901234567890210
> +/mnt/scratch/testdir/12345678901234567890211
> +/mnt/scratch/testdir/12345678901234567890212
> +/mnt/scratch/testdir/12345678901234567890213
> +/mnt/scratch/testdir/12345678901234567890214
> +/mnt/scratch/testdir/12345678901234567890215
> +/mnt/scratch/testdir/12345678901234567890216
> +/mnt/scratch/testdir/12345678901234567890217
> +/mnt/scratch/testdir/12345678901234567890218
> +/mnt/scratch/testdir/12345678901234567890219
> +/mnt/scratch/testdir/12345678901234567890220
> +/mnt/scratch/testdir/12345678901234567890221
> +/mnt/scratch/testdir/12345678901234567890222
> +/mnt/scratch/testdir/12345678901234567890223
> +/mnt/scratch/testdir/12345678901234567890224
> +/mnt/scratch/testdir/12345678901234567890225
> +/mnt/scratch/testdir/12345678901234567890226
> +/mnt/scratch/testdir/12345678901234567890227
> +/mnt/scratch/testdir/12345678901234567890228
> +/mnt/scratch/testdir/12345678901234567890229
> +/mnt/scratch/testdir/12345678901234567890230
> +/mnt/scratch/testdir/12345678901234567890231
> +/mnt/scratch/testdir/12345678901234567890232
> +/mnt/scratch/testdir/12345678901234567890233
> +/mnt/scratch/testdir/12345678901234567890234
> +/mnt/scratch/testdir/12345678901234567890235
> +/mnt/scratch/testdir/12345678901234567890236
> +/mnt/scratch/testdir/12345678901234567890237
> +/mnt/scratch/testdir/12345678901234567890238
> +/mnt/scratch/testdir/12345678901234567890239
> +/mnt/scratch/testdir/12345678901234567890240
> +/mnt/scratch/testdir/12345678901234567890241
> +/mnt/scratch/testdir/12345678901234567890242
> +/mnt/scratch/testdir/12345678901234567890243
> +/mnt/scratch/testdir/12345678901234567890244
> +/mnt/scratch/testdir/12345678901234567890245
> +/mnt/scratch/testdir/12345678901234567890246
> +/mnt/scratch/testdir/12345678901234567890247
> +/mnt/scratch/testdir/12345678901234567890248
> +/mnt/scratch/testdir/12345678901234567890249

MY EYES!!

> +/mnt/scratch/testdir/12345678901234567890250
> +/mnt/scratch/testdir/12345678901234567890251
> +/mnt/scratch/testdir/12345678901234567890252
> +/mnt/scratch/testdir/12345678901234567890253
> +/mnt/scratch/testdir/12345678901234567890254
> +/mnt/scratch/testdir/12345678901234567890255
> +/mnt/scratch/testdir/12345678901234567890256
> +/mnt/scratch/testdir/12345678901234567890257
> +/mnt/scratch/testdir/12345678901234567890258
> +/mnt/scratch/testdir/12345678901234567890259
> +/mnt/scratch/testdir/12345678901234567890260
> +/mnt/scratch/testdir/12345678901234567890261
> +/mnt/scratch/testdir/12345678901234567890262
> +/mnt/scratch/testdir/12345678901234567890263
> +/mnt/scratch/testdir/12345678901234567890264
> +/mnt/scratch/testdir/12345678901234567890265
> +/mnt/scratch/testdir/12345678901234567890266
> +/mnt/scratch/testdir/12345678901234567890267
> +/mnt/scratch/testdir/12345678901234567890268
> +/mnt/scratch/testdir/12345678901234567890269
> +/mnt/scratch/testdir/12345678901234567890270
> +/mnt/scratch/testdir/12345678901234567890271
> +/mnt/scratch/testdir/12345678901234567890272
> +/mnt/scratch/testdir/12345678901234567890273
> +/mnt/scratch/testdir/12345678901234567890274
> +/mnt/scratch/testdir/12345678901234567890275
> +/mnt/scratch/testdir/12345678901234567890276
> +/mnt/scratch/testdir/12345678901234567890277
> +/mnt/scratch/testdir/12345678901234567890278
> +/mnt/scratch/testdir/12345678901234567890279
> +/mnt/scratch/testdir/12345678901234567890280
> +/mnt/scratch/testdir/12345678901234567890281
> +/mnt/scratch/testdir/12345678901234567890282
> +/mnt/scratch/testdir/12345678901234567890283
> +/mnt/scratch/testdir/12345678901234567890284
> +/mnt/scratch/testdir/12345678901234567890285
> +/mnt/scratch/testdir/12345678901234567890286
> +/mnt/scratch/testdir/12345678901234567890287
> +/mnt/scratch/testdir/12345678901234567890288
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A Møøse once bit my sister... No realli!
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She was Karving her initials on the møøse with the sharpened end of an
interspace tøøthbrush given her by Svenge...
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We apologise for the fault in the subtitles. Those responsible have been sacked.
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Mynd you, møøse bites Kan be pretti nasti...
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We apologise again for the fault in the subtitles. Those responsible for
sacking the people who have just been sacked have been sacked.
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Møøse trained by YUTTE HERMSGERVØRDENBRØTBØRDA
Special Møøse Effects OLAF PROT
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The directors of the firm hired to continue the credits after the other
people had been sacked, wish it to be known that they have just been
sacked. The credits have been completed in an entirely different style
at great expense and at the last minute. 
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Directed By 40 SPECIALLY TRAINED ECUADORIAN MOUNTAIN LLAMAS 6 VENEZUELAN
RED LLAMAS 142 MEXICAN WHOOPING LLAMAS 14 NORTH CHILEAN GUANACOS...
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> diff --git a/tests/xfs/group b/tests/xfs/group
> index 75769f9..127cc36 100644
> --- a/tests/xfs/group
> +++ b/tests/xfs/group
> @@ -285,6 +285,7 @@
>  285 dangerous_fuzzers dangerous_scrub
>  286 dangerous_fuzzers dangerous_scrub dangerous_online_repair
>  287 auto dump quota quick
> +288 auto dir metadata dangerous
>  290 auto rw prealloc quick ioctl zero
>  291 auto repair
>  292 auto mkfs quick
> @@ -342,7 +343,7 @@
>  345 auto quick clone
>  346 auto quick clone
>  347 auto quick clone
> -348 auto quick fuzzers repair
> +348 auto quick fuzzers repair dangerous

Huh?

--D

>  349 dangerous_fuzzers scrub
>  350 dangerous_fuzzers dangerous_scrub dangerous_repair
>  351 dangerous_fuzzers dangerous_scrub dangerous_online_repair
> 
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Eric Sandeen April 13, 2017, 10:41 p.m. UTC | #2

On 4/13/17 5:34 PM, Darrick J. Wong wrote:
> On Thu, Apr 13, 2017 at 03:28:02PM -0500, Eric Sandeen wrote:
>> Test for the patch I just sent to the xfs list,
>> xfs: handle array index overrun in xfs_dir2_leaf_readbuf()
>>
>> Signed-off-by: Eric Sandeen <[e-mail]>
>> ---
>>
>> the .out file is very big; We could probably live without
>> it, since the test is just looking for a hang or a KASAN
>> splat.
>>
>> diff --git a/tests/xfs/288 b/tests/xfs/288
>> new file mode 100755
>> index 0000000..537b45b
>> --- /dev/null
>> +++ b/tests/xfs/288
>> @@ -0,0 +1,119 @@
>> +#! /bin/bash
>> +# FS QA Test 288
>> +#
>> +# Test readdir on fragmented multi-fsb dir blocks
>> +#
>> +# If the readahead map ends with a partial multi-fsb dir
>> +# block, the loop at the end of xfs_dir2_leaf_readbuf() may
>> +# walk off the end of the mapping array, read garbage,
>> +# corrupt the loop control counter, and never return.
>> +#
>> +# Failure is a hang; KASAN should also catch this.
>> +#
>> +#-----------------------------------------------------------------------
>> +# Copyright (c) 2017 Red Hat, Inc.  All Rights Reserved.
>> +# Author: Eric Sandeen <[e-mail]>
>> +#
>> +# This program is free software; you can redistribute it and/or
>> +# modify it under the terms of the GNU General Public License as
>> +# published by the Free Software Foundation.
>> +#
>> +# This program is distributed in the hope that it would be useful,
>> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
>> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> +# GNU General Public License for more details.
>> +#
>> +# You should have received a copy of the GNU General Public License
>> +# along with this program; if not, write the Free Software Foundation,
>> +# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
>> +#-----------------------------------------------------------------------
>> +#
>> +
>> +seq=`basename $0`
>> +seqres=$RESULT_DIR/$seq
>> +echo "QA output created by $seq"
>> +
>> +here=`pwd`
>> +tmp=/tmp/$$
>> +status=1	# failure is the default!
>> +trap "_cleanup; exit \$status" 0 1 2 3 15
>> +
>> +_cleanup()
>> +{
>> +	cd /
>> +	rm -f $tmp.*
>> +}
>> +
>> +# get standard environment, filters and checks
>> +. ./common/rc
>> +. ./common/filter
>> +
>> +# remove previous $seqres.full before test
>> +rm -f $seqres.full
>> +
>> +# real QA test starts here
>> +
>> +# Modify as appropriate.
>> +_supported_fs xfs
>> +_supported_os Linux
>> +_require_scratch
>> +_require_test_program "punch-alternating"
>> +
>> +# We want to override mkfs with a very specific geometry
>> +$MKFS_XFS_PROG -f -d size=512m -n size=8192 -i size=1024 $SCRATCH_DEV  \
>> +	> $seqres.full 2>&1 || _fail "mkfs failed"
>> +
>> +_scratch_mount
>> +
>> +# Make a ton of mostly-empty inode clusters so we can always
>> +# make more inodes
>> +mkdir $SCRATCH_MNT/tmp
>> +for I in `seq 1 10000`; do touch $SCRATCH_MNT/tmp/$I; done
>> +
>> +# These mostly-empty clusters will live here:
>> +mkdir $SCRATCH_MNT/clusters
>> +for I in `seq 1 32 10000`; do
>> +	mv $SCRATCH_MNT/tmp/$I $SCRATCH_MNT/clusters;
>> +done
>> +rm -rf $SCRATCH_MNT/tmp
>> +
>> +# Make our test dir with a couple blocks, should be contiguous
>> +mkdir $SCRATCH_MNT/testdir
>> +# roughly 20 chars per file
>> +for I in `seq 1 100`; do
>> +	touch $SCRATCH_MNT/testdir/12345678901234567890$I;
>> +done
>> +
>> +# Now completely fragment freespace.
>> +# Consume most of it:
>> +xfs_io -f -c "falloc 0 400m" $SCRATCH_MNT/fillfile ||
>> +	_fail "Could not allocate space"
>> +
>> +# File to fragment:
>> +xfs_io -f -c "falloc 0 70m" $SCRATCH_MNT/fragfile ||
>> +	_fail "Could not allocate space"
>> +
>> +df -h $SCRATCH_MNT > $seqres.full 2>&1
> 
> Truncates $seqres.full...

oops too much of a hurry, that was debug :/

>> +
>> +# Fill remaining space; let this run to failure
>> +dd if=/dev/zero of=$SCRATCH_MNT/spacefile1 oflag=direct > $seqres.full 2>&1
> 
> Truncates $seqres.full...
> 
>> +# Fragment our all-consuming file
>> +./src/punch-alternating $SCRATCH_MNT/fragfile > $seqres.full 2>&1
> 
> Trunca...oh never mind. :)

I suck.

>> +
>> +# Punching might have freed up large-ish swaths of metadata
>> +# Consume hopefully any remaining contiguous freespace
>> +# (and then some for good measure)
>> +dd if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64 > $seqres.full 2>&1
>> +xfs_io -c fsync $SCRATCH_MNT/spacefile2 > $seqres.full 2>&1
> 
> dd conv=fsync?

of course :)

>> +
>> +# Now populate the directory so that it must allocate these
>> +# fragmented blocks
>> +for I in `seq 1 1400`;
>> +	do touch $SCRATCH_MNT/testdir/12345678901234567890$I;
>> +done
>> +
>> +# Now traverse that ugly thing!
>> +find $SCRATCH_MNT/testdir
> 
> Spews ~1400 unfiltered scratch_mnt paths into the golden output...
> ...if you're looking for a hang or dmesg splat, there are ways to detect
> those.

Right, like I mentioned, probably not needed; it's not what the test
is after, but also nice to know that we get the right stuff back from
this insanely formatted dir.  I'm happy enough to remove it.

>> +
>> +status=0
>> +exit
>> diff --git a/tests/xfs/288.out b/tests/xfs/288.out
>> new file mode 100644


>> +/mnt/scratch/testdir/12345678901234567890248
>> +/mnt/scratch/testdir/12345678901234567890249
> 
> MY EYES!!

But wait, there's more!

>> +/mnt/scratch/testdir/12345678901234567890250
>> +/mnt/scratch/testdir/12345678901234567890251
>> +/mnt/scratch/testdir/12345678901234567890252
>> +/mnt/scratch/testdir/12345678901234567890253
>> +/mnt/scratch/testdir/12345678901234567890254
...
>> +/mnt/scratch/testdir/12345678901234567890358
> A Møøse once bit my sister... No realli!
>> +/mnt/scratch/testdir/12345678901234567890359
...
>> +/mnt/scratch/testdir/12345678901234567890458
>> +/mnt/scratch/testdir/12345678901234567890459
> She was Karving her initials on the møøse with the sharpened end of an
> interspace tøøthbrush given her by Svenge...
>> +/mnt/scratch/testdir/12345678901234567890460
>> +/mnt/scratch/testdir/12345678901234567890461
...
>> +/mnt/scratch/testdir/12345678901234567890663
>> +/mnt/scratch/testdir/12345678901234567890664
> We apologise for the fault in the subtitles. Those responsible have been sacked.
>> +/mnt/scratch/testdir/12345678901234567890665
>> +/mnt/scratch/testdir/12345678901234567890666
...
>> +/mnt/scratch/testdir/12345678901234567890801
>> +/mnt/scratch/testdir/12345678901234567890802
> Mynd you, møøse bites Kan be pretti nasti...
>> +/mnt/scratch/testdir/12345678901234567890803
>> +/mnt/scratch/testdir/12345678901234567890804
>> +/mnt/scratch/testdir/12345678901234567890805
...
>> +/mnt/scratch/testdir/12345678901234567890944
>> +/mnt/scratch/testdir/12345678901234567890945
>> +/mnt/scratch/testdir/12345678901234567890946
> We apologise again for the fault in the subtitles. Those responsible for
> sacking the people who have just been sacked have been sacked.
>> +/mnt/scratch/testdir/12345678901234567890947
>> +/mnt/scratch/testdir/12345678901234567890948
...
>> +/mnt/scratch/testdir/123456789012345678901122
>> +/mnt/scratch/testdir/123456789012345678901123
> Møøse trained by YUTTE HERMSGERVØRDENBRØTBØRDA
> Special Møøse Effects OLAF PROT
>> +/mnt/scratch/testdir/123456789012345678901124
>> +/mnt/scratch/testdir/123456789012345678901125
...
>> +/mnt/scratch/testdir/123456789012345678901184
>> +/mnt/scratch/testdir/123456789012345678901185
> The directors of the firm hired to continue the credits after the other
> people had been sacked, wish it to be known that they have just been
> sacked. The credits have been completed in an entirely different style
> at great expense and at the last minute. 
>> +/mnt/scratch/testdir/123456789012345678901186
>> +/mnt/scratch/testdir/123456789012345678901187
...
>> +/mnt/scratch/testdir/123456789012345678901312
>> +/mnt/scratch/testdir/123456789012345678901313
>> +/mnt/scratch/testdir/123456789012345678901314
> Directed By 40 SPECIALLY TRAINED ECUADORIAN MOUNTAIN LLAMAS 6 VENEZUELAN
> RED LLAMAS 142 MEXICAN WHOOPING LLAMAS 14 NORTH CHILEAN GUANACOS...
>> +/mnt/scratch/testdir/123456789012345678901315
>> +/mnt/scratch/testdir/123456789012345678901316
...

Thank you.  No, really.  :)

>> +/mnt/scratch/testdir/123456789012345678901399
>> +/mnt/scratch/testdir/123456789012345678901400
>> diff --git a/tests/xfs/group b/tests/xfs/group
>> index 75769f9..127cc36 100644
>> --- a/tests/xfs/group
>> +++ b/tests/xfs/group
>> @@ -285,6 +285,7 @@
>>  285 dangerous_fuzzers dangerous_scrub
>>  286 dangerous_fuzzers dangerous_scrub dangerous_online_repair
>>  287 auto dump quota quick
>> +288 auto dir metadata dangerous
>>  290 auto rw prealloc quick ioctl zero
>>  291 auto repair
>>  292 auto mkfs quick
>> @@ -342,7 +343,7 @@
>>  345 auto quick clone
>>  346 auto quick clone
>>  347 auto quick clone
>> -348 auto quick fuzzers repair
>> +348 auto quick fuzzers repair dangerous
> 
> Huh?

Sigh.

-Eric
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Eric Sandeen April 13, 2017, 10:49 p.m. UTC | #3

On 4/13/17 3:28 PM, Eric Sandeen wrote:
> Test for the patch I just sent to the xfs list,
> xfs: handle array index overrun in xfs_dir2_leaf_readbuf()
> 
> Signed-off-by: Eric Sandeen <[e-mail]>
> ---
> 
> the .out file is very big; We could probably live without
> it, since the test is just looking for a hang or a KASAN
> splat.


yes, KASAN finds it:

[  967.157394] ==================================================================
[  967.164844] BUG: KASAN: slab-out-of-bounds in xfs_dir2_leaf_readbuf+0x1fb0/0x22b0 [xfs] at addr ffff8800b9b1e538
[  967.175017] Read of size 8 by task find/13180
[  967.179405] CPU: 9 PID: 13180 Comm: find Tainted: G          IO    4.11.0-rc6+ #1
[  967.186887] Hardware name: Dell Inc. PowerEdge M710/0N583M, BIOS 3.0.0 01/31/2011
[  967.194368] Call Trace:
[  967.196830]  dump_stack+0xe3/0x191
[  967.200240]  ? _atomic_dec_and_lock+0x18f/0x18f
[  967.204780]  ? pm_qos_get_value.part.4+0x6/0x6
[  967.209292]  kasan_object_err+0x21/0x70
[  967.213190]  kasan_report+0x26f/0x520
[  967.216948]  ? xfs_dir2_leaf_readbuf+0x1fb0/0x22b0 [xfs]
[  967.222335]  __asan_report_load8_noabort+0x19/0x20
[  967.227272]  xfs_dir2_leaf_readbuf+0x1fb0/0x22b0 [xfs]
[  967.232621]  ? xfs_dir3_get_dtype+0x140/0x140 [xfs]
[  967.237623]  ? xfs_get_cowextsz_hint+0x130/0x130 [xfs]
[  967.242770]  ? kasan_kmalloc+0xad/0xe0
[  967.246706]  xfs_dir2_leaf_getdents+0x4c6/0x10a0 [xfs]
[  967.251964]  ? xfs_dir2_leaf_getdents+0x4c6/0x10a0 [xfs]
[  967.257289]  ? save_trace+0x350/0x350
[  967.261027]  ? __fsnotify_update_child_dentry_flags.part.2+0x260/0x260
[  967.267715]  ? xfs_dir2_leaf_readbuf+0x22b0/0x22b0 [xfs]
[  967.273181]  ? xfs_dir2_isblock+0xa0/0x340 [xfs]
[  967.277899]  ? xfs_dir2_grow_inode+0x890/0x890 [xfs]
[  967.283031]  xfs_readdir+0x3f4/0x880 [xfs]
[  967.287278]  ? xfs_dir2_block_getdents.isra.9+0x970/0x970 [xfs]
[  967.293284]  ? debug_lockdep_rcu_enabled+0x77/0x90
[  967.298192]  ? down_read+0xca/0x1b0
[  967.301714]  ? down_write_killable_nested+0x1b0/0x1b0
[  967.306931]  xfs_file_readdir+0x72/0xa0 [xfs]
[  967.311410]  iterate_dir+0x46d/0x670
[  967.315022]  SyS_getdents+0x1fc/0x400
[  967.318747]  ? SyS_old_readdir+0x230/0x230
[  967.322850]  ? fillonedir+0x260/0x260
[  967.326575]  ? trace_hardirqs_on_caller+0x38b/0x590
[  967.331470]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[  967.336158]  entry_SYSCALL_64_fastpath+0x1f/0xc2
[  967.340831] RIP: 0033:0x7efc1434df5b
[  967.344417] RSP: 002b:00007ffccf244920 EFLAGS: 00000202 ORIG_RAX: 000000000000004e
[  967.352053] RAX: ffffffffffffffda RBX: 000055e74cd8c550 RCX: 00007efc1434df5b
[  967.359184] RDX: 0000000000008000 RSI: 000055e74cd8c550 RDI: 0000000000000004
[  967.366316] RBP: 0000000000000046 R08: 000055e74cd8a960 R09: 0000000000000078
[  967.373449] R10: 0000000000000100 R11: 0000000000000202 R12: 0000000000000000
[  967.380583] R13: 0000000000008040 R14: 00007efc14649b38 R15: 0000000000002710
[  967.387716]  ? entry_SYSCALL_64_fastpath+0x1f/0xc2
[  967.392606] Object at ffff8800b9b1e300, in cache kmalloc-1024 size: 1024
[  967.399343] Allocated:
[  967.401709] PID = 13180
[  967.404164]  save_stack_trace+0x1b/0x20
[  967.408048]  save_stack+0x43/0xd0
[  967.411374]  kasan_kmalloc+0xad/0xe0
[  967.414998]  __kmalloc+0x14d/0x360
[  967.418498]  kmem_alloc+0x81/0x190 [xfs]
[  967.422567]  xfs_dir2_leaf_getdents+0x24a/0x10a0 [xfs]
[  967.427870]  xfs_readdir+0x3f4/0x880 [xfs]
[  967.432066]  xfs_file_readdir+0x72/0xa0 [xfs]
[  967.436490]  iterate_dir+0x46d/0x670
[  967.440070]  SyS_getdents+0x1fc/0x400
[  967.443743]  entry_SYSCALL_64_fastpath+0x1f/0xc2
[  967.448396] Freed:
[  967.450416] PID = 0
[  967.452565]  save_stack_trace+0x1b/0x20
[  967.456406]  save_stack+0x43/0xd0
[  967.459733]  kasan_slab_free+0x73/0xc0
[  967.463511]  kfree+0x109/0x300
[  967.466571]  free_request_size+0x4c/0x60
[  967.470498]  mempool_free+0xca/0x1b0
[  967.474128]  __blk_put_request+0x3a7/0x780
[  967.478229]  blk_finish_request+0x286/0x600
[  967.482475]  scsi_end_request+0x2c8/0x700
[  967.486495]  scsi_io_completion+0x83a/0x1c50
[  967.490796]  scsi_finish_command+0x5a2/0x8e0
[  967.495083]  scsi_softirq_done+0x348/0x480
[  967.499184]  blk_done_softirq+0x40f/0x6d0
[  967.503257]  __do_softirq+0x2e6/0xb5f
[  967.506927] Memory state around the buggy address:
[  967.511775]  ffff8800b9b1e400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  967.519003]  ffff8800b9b1e480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  967.526221] >ffff8800b9b1e500: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
[  967.533440]                                         ^
[  967.538493]  ffff8800b9b1e580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  967.545780]  ffff8800b9b1e600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[  967.553084] ==================================================================
[  967.560305] Disabling lock debugging due to kernel taint
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Eryu Guan April 14, 2017, 3:50 a.m. UTC | #4

On Thu, Apr 13, 2017 at 03:28:02PM -0500, Eric Sandeen wrote:
> Test for the patch I just sent to the xfs list,
> xfs: handle array index overrun in xfs_dir2_leaf_readbuf()
> 
> Signed-off-by: Eric Sandeen <[e-mail]>
> ---
> 
> the .out file is very big; We could probably live without
> it, since the test is just looking for a hang or a KASAN
> splat.

If failure is a hang, then I agree that probably we don't need the long
.out file :)

> 
> diff --git a/tests/xfs/288 b/tests/xfs/288
> new file mode 100755
> index 0000000..537b45b
> --- /dev/null
> +++ b/tests/xfs/288
> @@ -0,0 +1,119 @@
> +#! /bin/bash
> +# FS QA Test 288
> +#
> +# Test readdir on fragmented multi-fsb dir blocks
> +#
> +# If the readahead map ends with a partial multi-fsb dir
> +# block, the loop at the end of xfs_dir2_leaf_readbuf() may
> +# walk off the end of the mapping array, read garbage,
> +# corrupt the loop control counter, and never return.
> +#
> +# Failure is a hang; KASAN should also catch this.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2017 Red Hat, Inc.  All Rights Reserved.
> +# Author: Eric Sandeen <[e-mail]>
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program; if not, write the Free Software Foundation,
> +# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> +#-----------------------------------------------------------------------
> +#
> +
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +	cd /
> +	rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs xfs
> +_supported_os Linux
> +_require_scratch
> +_require_test_program "punch-alternating"
> +
> +# We want to override mkfs with a very specific geometry
> +$MKFS_XFS_PROG -f -d size=512m -n size=8192 -i size=1024 $SCRATCH_DEV  \
> +	> $seqres.full 2>&1 || _fail "mkfs failed"

_scratch_mkfs "-d size=512m -n size=8192 -i size=1024" || _fail ...

should just do the work. If there's any mkfs options conflicts between
MKFS_OPTIONS and this local-specified mkfs options, _scratch_mkfs would
try mkfs again without MKFS_OPTIONS.

Or further, set MKFS_OPTIONS to empty before _scratch_mkfs call, if it's
not relevant in this test?

> +
> +_scratch_mount
> +
> +# Make a ton of mostly-empty inode clusters so we can always
> +# make more inodes
> +mkdir $SCRATCH_MNT/tmp
> +for I in `seq 1 10000`; do touch $SCRATCH_MNT/tmp/$I; done

"echo > somefile" might be faster. Replace all touch with echo in this
test?

> +
> +# These mostly-empty clusters will live here:
> +mkdir $SCRATCH_MNT/clusters
> +for I in `seq 1 32 10000`; do
> +	mv $SCRATCH_MNT/tmp/$I $SCRATCH_MNT/clusters;
> +done
> +rm -rf $SCRATCH_MNT/tmp
> +
> +# Make our test dir with a couple blocks, should be contiguous
> +mkdir $SCRATCH_MNT/testdir
> +# roughly 20 chars per file
> +for I in `seq 1 100`; do
> +	touch $SCRATCH_MNT/testdir/12345678901234567890$I;
> +done
> +
> +# Now completely fragment freespace.
> +# Consume most of it:
> +xfs_io -f -c "falloc 0 400m" $SCRATCH_MNT/fillfile ||
> +	_fail "Could not allocate space"
> +
> +# File to fragment:
> +xfs_io -f -c "falloc 0 70m" $SCRATCH_MNT/fragfile ||
> +	_fail "Could not allocate space"

s/xfs_io/$XFS_IO_PROG/

And I think we can continue the test even if falloc failed, no harm to
run more tests in this 'error' path.

> +
> +df -h $SCRATCH_MNT > $seqres.full 2>&1
> +
> +# Fill remaining space; let this run to failure
> +dd if=/dev/zero of=$SCRATCH_MNT/spacefile1 oflag=direct > $seqres.full 2>&1
> +# Fragment our all-consuming file
> +./src/punch-alternating $SCRATCH_MNT/fragfile > $seqres.full 2>&1
> +
> +# Punching might have freed up large-ish swaths of metadata
> +# Consume hopefully any remaining contiguous freespace
> +# (and then some for good measure)
> +dd if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64 > $seqres.full 2>&1
> +xfs_io -c fsync $SCRATCH_MNT/spacefile2 > $seqres.full 2>&1
> +
> +# Now populate the directory so that it must allocate these
> +# fragmented blocks
> +for I in `seq 1 1400`;
> +	do touch $SCRATCH_MNT/testdir/12345678901234567890$I;

Place "do" at the end of last line?

> +done
> +
> +# Now traverse that ugly thing!
> +find $SCRATCH_MNT/testdir
> +

If we want to verify we get all the right files back from testdir,
probably we can take an md5 checksum of the find output, instead of
dumping all these files. (not tested, but I think should work)

find $SCRATCH_MNT/testdir | sort | _filter_scratch | md5sum

Thanks,
Eryu
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Patch

diff --git a/tests/xfs/288 b/tests/xfs/288
new file mode 100755
index 0000000..537b45b
--- /dev/null
+++ b/tests/xfs/288
@@ -0,0 +1,119 @@ 
+#! /bin/bash
+# FS QA Test 288
+#
+# Test readdir on fragmented multi-fsb dir blocks
+#
+# If the readahead map ends with a partial multi-fsb dir
+# block, the loop at the end of xfs_dir2_leaf_readbuf() may
+# walk off the end of the mapping array, read garbage,
+# corrupt the loop control counter, and never return.
+#
+# Failure is a hang; KASAN should also catch this.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 Red Hat, Inc.  All Rights Reserved.
+# Author: Eric Sandeen <[e-mail]>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs xfs
+_supported_os Linux
+_require_scratch
+_require_test_program "punch-alternating"
+
+# We want to override mkfs with a very specific geometry
+$MKFS_XFS_PROG -f -d size=512m -n size=8192 -i size=1024 $SCRATCH_DEV  \
+	> $seqres.full 2>&1 || _fail "mkfs failed"
+
+_scratch_mount
+
+# Make a ton of mostly-empty inode clusters so we can always
+# make more inodes
+mkdir $SCRATCH_MNT/tmp
+for I in `seq 1 10000`; do touch $SCRATCH_MNT/tmp/$I; done
+
+# These mostly-empty clusters will live here:
+mkdir $SCRATCH_MNT/clusters
+for I in `seq 1 32 10000`; do
+	mv $SCRATCH_MNT/tmp/$I $SCRATCH_MNT/clusters;
+done
+rm -rf $SCRATCH_MNT/tmp
+
+# Make our test dir with a couple blocks, should be contiguous
+mkdir $SCRATCH_MNT/testdir
+# roughly 20 chars per file
+for I in `seq 1 100`; do
+	touch $SCRATCH_MNT/testdir/12345678901234567890$I;
+done
+
+# Now completely fragment freespace.
+# Consume most of it:
+xfs_io -f -c "falloc 0 400m" $SCRATCH_MNT/fillfile ||
+	_fail "Could not allocate space"
+
+# File to fragment:
+xfs_io -f -c "falloc 0 70m" $SCRATCH_MNT/fragfile ||
+	_fail "Could not allocate space"
+
+df -h $SCRATCH_MNT > $seqres.full 2>&1
+
+# Fill remaining space; let this run to failure
+dd if=/dev/zero of=$SCRATCH_MNT/spacefile1 oflag=direct > $seqres.full 2>&1
+# Fragment our all-consuming file
+./src/punch-alternating $SCRATCH_MNT/fragfile > $seqres.full 2>&1
+
+# Punching might have freed up large-ish swaths of metadata
+# Consume hopefully any remaining contiguous freespace
+# (and then some for good measure)
+dd if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64 > $seqres.full 2>&1
+xfs_io -c fsync $SCRATCH_MNT/spacefile2 > $seqres.full 2>&1
+
+# Now populate the directory so that it must allocate these
+# fragmented blocks
+for I in `seq 1 1400`;
+	do touch $SCRATCH_MNT/testdir/12345678901234567890$I;
+done
+
+# Now traverse that ugly thing!
+find $SCRATCH_MNT/testdir
+
+status=0
+exit
diff --git a/tests/xfs/288.out b/tests/xfs/288.out
new file mode 100644
index 0000000..38b0e8c
--- /dev/null
+++ b/tests/xfs/288.out
@@ -0,0 +1,1402 @@ 
+QA output created by 288
+/mnt/scratch/testdir
+/mnt/scratch/testdir/123456789012345678901
+/mnt/scratch/testdir/123456789012345678902
+/mnt/scratch/testdir/123456789012345678903
+/mnt/scratch/testdir/123456789012345678904
+/mnt/scratch/testdir/123456789012345678905
+/mnt/scratch/testdir/123456789012345678906
+/mnt/scratch/testdir/123456789012345678907
+/mnt/scratch/testdir/123456789012345678908
+/mnt/scratch/testdir/123456789012345678909
+/mnt/scratch/testdir/1234567890123456789010
+/mnt/scratch/testdir/1234567890123456789011
+/mnt/scratch/testdir/1234567890123456789012
+/mnt/scratch/testdir/1234567890123456789013
+/mnt/scratch/testdir/1234567890123456789014
+/mnt/scratch/testdir/1234567890123456789015
+/mnt/scratch/testdir/1234567890123456789016
+/mnt/scratch/testdir/1234567890123456789017
+/mnt/scratch/testdir/1234567890123456789018
+/mnt/scratch/testdir/1234567890123456789019
+/mnt/scratch/testdir/1234567890123456789020
+/mnt/scratch/testdir/1234567890123456789021
+/mnt/scratch/testdir/1234567890123456789022
+/mnt/scratch/testdir/1234567890123456789023
+/mnt/scratch/testdir/1234567890123456789024
+/mnt/scratch/testdir/1234567890123456789025
+/mnt/scratch/testdir/1234567890123456789026
+/mnt/scratch/testdir/1234567890123456789027
+/mnt/scratch/testdir/1234567890123456789028
+/mnt/scratch/testdir/1234567890123456789029
+/mnt/scratch/testdir/1234567890123456789030
+/mnt/scratch/testdir/1234567890123456789031
+/mnt/scratch/testdir/1234567890123456789032
+/mnt/scratch/testdir/1234567890123456789033
+/mnt/scratch/testdir/1234567890123456789034
+/mnt/scratch/testdir/1234567890123456789035
+/mnt/scratch/testdir/1234567890123456789036
+/mnt/scratch/testdir/1234567890123456789037
+/mnt/scratch/testdir/1234567890123456789038
+/mnt/scratch/testdir/1234567890123456789039
+/mnt/scratch/testdir/1234567890123456789040
+/mnt/scratch/testdir/1234567890123456789041
+/mnt/scratch/testdir/1234567890123456789042
+/mnt/scratch/testdir/1234567890123456789043
+/mnt/scratch/testdir/1234567890123456789044
+/mnt/scratch/testdir/1234567890123456789045
+/mnt/scratch/testdir/1234567890123456789046
+/mnt/scratch/testdir/1234567890123456789047
+/mnt/scratch/testdir/1234567890123456789048
+/mnt/scratch/testdir/1234567890123456789049
+/mnt/scratch/testdir/1234567890123456789050
+/mnt/scratch/testdir/1234567890123456789051
+/mnt/scratch/testdir/1234567890123456789052
+/mnt/scratch/testdir/1234567890123456789053
+/mnt/scratch/testdir/1234567890123456789054
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+/mnt/scratch/testdir/1234567890123456789057
+/mnt/scratch/testdir/1234567890123456789058
+/mnt/scratch/testdir/1234567890123456789059
+/mnt/scratch/testdir/1234567890123456789060
+/mnt/scratch/testdir/1234567890123456789061
+/mnt/scratch/testdir/1234567890123456789062
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+/mnt/scratch/testdir/1234567890123456789064
+/mnt/scratch/testdir/1234567890123456789065
+/mnt/scratch/testdir/1234567890123456789066
+/mnt/scratch/testdir/1234567890123456789067
+/mnt/scratch/testdir/1234567890123456789068
+/mnt/scratch/testdir/1234567890123456789069
+/mnt/scratch/testdir/1234567890123456789070
+/mnt/scratch/testdir/1234567890123456789071
+/mnt/scratch/testdir/1234567890123456789072
+/mnt/scratch/testdir/1234567890123456789073
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+/mnt/scratch/testdir/1234567890123456789078
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+/mnt/scratch/testdir/1234567890123456789085
+/mnt/scratch/testdir/1234567890123456789086
+/mnt/scratch/testdir/1234567890123456789087
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+/mnt/scratch/testdir/1234567890123456789089
+/mnt/scratch/testdir/1234567890123456789090
+/mnt/scratch/testdir/1234567890123456789091
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+/mnt/scratch/testdir/1234567890123456789093
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+/mnt/scratch/testdir/12345678901234567890100
+/mnt/scratch/testdir/12345678901234567890101
+/mnt/scratch/testdir/12345678901234567890102
+/mnt/scratch/testdir/12345678901234567890103
+/mnt/scratch/testdir/12345678901234567890104
+/mnt/scratch/testdir/12345678901234567890105
+/mnt/scratch/testdir/12345678901234567890106
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+/mnt/scratch/testdir/12345678901234567890114
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+/mnt/scratch/testdir/12345678901234567890117
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+/mnt/scratch/testdir/12345678901234567890123
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+/mnt/scratch/testdir/12345678901234567890125
+/mnt/scratch/testdir/12345678901234567890126
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+/mnt/scratch/testdir/12345678901234567890130
+/mnt/scratch/testdir/12345678901234567890131
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+/mnt/scratch/testdir/12345678901234567890133
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+/mnt/scratch/testdir/12345678901234567890137
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+/mnt/scratch/testdir/12345678901234567890143
+/mnt/scratch/testdir/12345678901234567890144
+/mnt/scratch/testdir/12345678901234567890145
+/mnt/scratch/testdir/12345678901234567890146
+/mnt/scratch/testdir/12345678901234567890147
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+/mnt/scratch/testdir/12345678901234567890149
+/mnt/scratch/testdir/12345678901234567890150
+/mnt/scratch/testdir/12345678901234567890151
+/mnt/scratch/testdir/12345678901234567890152
+/mnt/scratch/testdir/12345678901234567890153
+/mnt/scratch/testdir/12345678901234567890154
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+/mnt/scratch/testdir/12345678901234567890156
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+/mnt/scratch/testdir/12345678901234567890158
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+/mnt/scratch/testdir/12345678901234567890160
+/mnt/scratch/testdir/12345678901234567890161
+/mnt/scratch/testdir/12345678901234567890162
+/mnt/scratch/testdir/12345678901234567890163
+/mnt/scratch/testdir/12345678901234567890164
+/mnt/scratch/testdir/12345678901234567890165
+/mnt/scratch/testdir/12345678901234567890166
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+/mnt/scratch/testdir/12345678901234567890168
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+/mnt/scratch/testdir/12345678901234567890170
+/mnt/scratch/testdir/12345678901234567890171
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+/mnt/scratch/testdir/12345678901234567890173
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+/mnt/scratch/testdir/12345678901234567890182
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+/mnt/scratch/testdir/12345678901234567890184
+/mnt/scratch/testdir/12345678901234567890185
+/mnt/scratch/testdir/12345678901234567890186
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+/mnt/scratch/testdir/12345678901234567890189
+/mnt/scratch/testdir/12345678901234567890190
+/mnt/scratch/testdir/12345678901234567890191
+/mnt/scratch/testdir/12345678901234567890192
+/mnt/scratch/testdir/12345678901234567890193
+/mnt/scratch/testdir/12345678901234567890194
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+/mnt/scratch/testdir/12345678901234567890226
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+/mnt/scratch/testdir/12345678901234567890231
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+/mnt/scratch/testdir/12345678901234567890233
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diff --git a/tests/xfs/group b/tests/xfs/group
index 75769f9..127cc36 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -285,6 +285,7 @@ 
 285 dangerous_fuzzers dangerous_scrub
 286 dangerous_fuzzers dangerous_scrub dangerous_online_repair
 287 auto dump quota quick
+288 auto dir metadata dangerous
 290 auto rw prealloc quick ioctl zero
 291 auto repair
 292 auto mkfs quick
@@ -342,7 +343,7 @@ 
 345 auto quick clone
 346 auto quick clone
 347 auto quick clone
-348 auto quick fuzzers repair
+348 auto quick fuzzers repair dangerous
 349 dangerous_fuzzers scrub
 350 dangerous_fuzzers dangerous_scrub dangerous_repair
 351 dangerous_fuzzers dangerous_scrub dangerous_online_repair