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* [PATCH] xfs/288: test fragmented multi-fsb readdir
@ 2017-04-13 20:28 Eric Sandeen
  2017-04-13 22:34 ` Darrick J. Wong
                   ` (3 more replies)
  0 siblings, 4 replies; 14+ messages in thread
From: Eric Sandeen @ 2017-04-13 20:28 UTC (permalink / raw)
  To: fstests

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 <sandeen@redhat.com>
---

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 <sandeen@redhat.com>
+#
+# 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
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+/mnt/scratch/testdir/123456789012345678901198
+/mnt/scratch/testdir/123456789012345678901199
+/mnt/scratch/testdir/123456789012345678901200
+/mnt/scratch/testdir/123456789012345678901201
+/mnt/scratch/testdir/123456789012345678901202
+/mnt/scratch/testdir/123456789012345678901203
+/mnt/scratch/testdir/123456789012345678901204
+/mnt/scratch/testdir/123456789012345678901205
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+/mnt/scratch/testdir/123456789012345678901207
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+/mnt/scratch/testdir/123456789012345678901209
+/mnt/scratch/testdir/123456789012345678901210
+/mnt/scratch/testdir/123456789012345678901211
+/mnt/scratch/testdir/123456789012345678901212
+/mnt/scratch/testdir/123456789012345678901213
+/mnt/scratch/testdir/123456789012345678901214
+/mnt/scratch/testdir/123456789012345678901215
+/mnt/scratch/testdir/123456789012345678901216
+/mnt/scratch/testdir/123456789012345678901217
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+/mnt/scratch/testdir/123456789012345678901220
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+/mnt/scratch/testdir/123456789012345678901222
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+/mnt/scratch/testdir/123456789012345678901225
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+/mnt/scratch/testdir/123456789012345678901237
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+/mnt/scratch/testdir/123456789012345678901241
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+/mnt/scratch/testdir/123456789012345678901243
+/mnt/scratch/testdir/123456789012345678901244
+/mnt/scratch/testdir/123456789012345678901245
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+/mnt/scratch/testdir/123456789012345678901247
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+/mnt/scratch/testdir/123456789012345678901249
+/mnt/scratch/testdir/123456789012345678901250
+/mnt/scratch/testdir/123456789012345678901251
+/mnt/scratch/testdir/123456789012345678901252
+/mnt/scratch/testdir/123456789012345678901253
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+/mnt/scratch/testdir/123456789012345678901256
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+/mnt/scratch/testdir/123456789012345678901269
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+/mnt/scratch/testdir/123456789012345678901278
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+/mnt/scratch/testdir/123456789012345678901280
+/mnt/scratch/testdir/123456789012345678901281
+/mnt/scratch/testdir/123456789012345678901282
+/mnt/scratch/testdir/123456789012345678901283
+/mnt/scratch/testdir/123456789012345678901284
+/mnt/scratch/testdir/123456789012345678901285
+/mnt/scratch/testdir/123456789012345678901286
+/mnt/scratch/testdir/123456789012345678901287
+/mnt/scratch/testdir/123456789012345678901288
+/mnt/scratch/testdir/123456789012345678901289
+/mnt/scratch/testdir/123456789012345678901290
+/mnt/scratch/testdir/123456789012345678901291
+/mnt/scratch/testdir/123456789012345678901292
+/mnt/scratch/testdir/123456789012345678901293
+/mnt/scratch/testdir/123456789012345678901294
+/mnt/scratch/testdir/123456789012345678901295
+/mnt/scratch/testdir/123456789012345678901296
+/mnt/scratch/testdir/123456789012345678901297
+/mnt/scratch/testdir/123456789012345678901298
+/mnt/scratch/testdir/123456789012345678901299
+/mnt/scratch/testdir/123456789012345678901300
+/mnt/scratch/testdir/123456789012345678901301
+/mnt/scratch/testdir/123456789012345678901302
+/mnt/scratch/testdir/123456789012345678901303
+/mnt/scratch/testdir/123456789012345678901304
+/mnt/scratch/testdir/123456789012345678901305
+/mnt/scratch/testdir/123456789012345678901306
+/mnt/scratch/testdir/123456789012345678901307
+/mnt/scratch/testdir/123456789012345678901308
+/mnt/scratch/testdir/123456789012345678901309
+/mnt/scratch/testdir/123456789012345678901310
+/mnt/scratch/testdir/123456789012345678901311
+/mnt/scratch/testdir/123456789012345678901312
+/mnt/scratch/testdir/123456789012345678901313
+/mnt/scratch/testdir/123456789012345678901314
+/mnt/scratch/testdir/123456789012345678901315
+/mnt/scratch/testdir/123456789012345678901316
+/mnt/scratch/testdir/123456789012345678901317
+/mnt/scratch/testdir/123456789012345678901318
+/mnt/scratch/testdir/123456789012345678901319
+/mnt/scratch/testdir/123456789012345678901320
+/mnt/scratch/testdir/123456789012345678901321
+/mnt/scratch/testdir/123456789012345678901322
+/mnt/scratch/testdir/123456789012345678901323
+/mnt/scratch/testdir/123456789012345678901324
+/mnt/scratch/testdir/123456789012345678901325
+/mnt/scratch/testdir/123456789012345678901326
+/mnt/scratch/testdir/123456789012345678901327
+/mnt/scratch/testdir/123456789012345678901328
+/mnt/scratch/testdir/123456789012345678901329
+/mnt/scratch/testdir/123456789012345678901330
+/mnt/scratch/testdir/123456789012345678901331
+/mnt/scratch/testdir/123456789012345678901332
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+/mnt/scratch/testdir/123456789012345678901336
+/mnt/scratch/testdir/123456789012345678901337
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+/mnt/scratch/testdir/123456789012345678901340
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+/mnt/scratch/testdir/123456789012345678901349
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+/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
 349 dangerous_fuzzers scrub
 350 dangerous_fuzzers dangerous_scrub dangerous_repair
 351 dangerous_fuzzers dangerous_scrub dangerous_online_repair


^ permalink raw reply related	[flat|nested] 14+ messages in thread

* Re: [PATCH] xfs/288: test fragmented multi-fsb readdir
  2017-04-13 20:28 [PATCH] xfs/288: test fragmented multi-fsb readdir Eric Sandeen
@ 2017-04-13 22:34 ` Darrick J. Wong
  2017-04-13 22:41   ` Eric Sandeen
  2017-04-13 22:49 ` Eric Sandeen
                   ` (2 subsequent siblings)
  3 siblings, 1 reply; 14+ messages in thread
From: Darrick J. Wong @ 2017-04-13 22:34 UTC (permalink / raw)
  To: Eric Sandeen; +Cc: fstests

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 <sandeen@redhat.com>
> ---
> 
> 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 <sandeen@redhat.com>
> +#
> +# 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
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> +/mnt/scratch/testdir/12345678901234567890249

MY EYES!!

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A Møøse once bit my sister... No realli!
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> +/mnt/scratch/testdir/12345678901234567890459
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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> +/mnt/scratch/testdir/123456789012345678901246
> +/mnt/scratch/testdir/123456789012345678901247
> +/mnt/scratch/testdir/123456789012345678901248
> +/mnt/scratch/testdir/123456789012345678901249
> +/mnt/scratch/testdir/123456789012345678901250
> +/mnt/scratch/testdir/123456789012345678901251
> +/mnt/scratch/testdir/123456789012345678901252
> +/mnt/scratch/testdir/123456789012345678901253
> +/mnt/scratch/testdir/123456789012345678901254
> +/mnt/scratch/testdir/123456789012345678901255
> +/mnt/scratch/testdir/123456789012345678901256
> +/mnt/scratch/testdir/123456789012345678901257
> +/mnt/scratch/testdir/123456789012345678901258
> +/mnt/scratch/testdir/123456789012345678901259
> +/mnt/scratch/testdir/123456789012345678901260
> +/mnt/scratch/testdir/123456789012345678901261
> +/mnt/scratch/testdir/123456789012345678901262
> +/mnt/scratch/testdir/123456789012345678901263
> +/mnt/scratch/testdir/123456789012345678901264
> +/mnt/scratch/testdir/123456789012345678901265
> +/mnt/scratch/testdir/123456789012345678901266
> +/mnt/scratch/testdir/123456789012345678901267
> +/mnt/scratch/testdir/123456789012345678901268
> +/mnt/scratch/testdir/123456789012345678901269
> +/mnt/scratch/testdir/123456789012345678901270
> +/mnt/scratch/testdir/123456789012345678901271
> +/mnt/scratch/testdir/123456789012345678901272
> +/mnt/scratch/testdir/123456789012345678901273
> +/mnt/scratch/testdir/123456789012345678901274
> +/mnt/scratch/testdir/123456789012345678901275
> +/mnt/scratch/testdir/123456789012345678901276
> +/mnt/scratch/testdir/123456789012345678901277
> +/mnt/scratch/testdir/123456789012345678901278
> +/mnt/scratch/testdir/123456789012345678901279
> +/mnt/scratch/testdir/123456789012345678901280
> +/mnt/scratch/testdir/123456789012345678901281
> +/mnt/scratch/testdir/123456789012345678901282
> +/mnt/scratch/testdir/123456789012345678901283
> +/mnt/scratch/testdir/123456789012345678901284
> +/mnt/scratch/testdir/123456789012345678901285
> +/mnt/scratch/testdir/123456789012345678901286
> +/mnt/scratch/testdir/123456789012345678901287
> +/mnt/scratch/testdir/123456789012345678901288
> +/mnt/scratch/testdir/123456789012345678901289
> +/mnt/scratch/testdir/123456789012345678901290
> +/mnt/scratch/testdir/123456789012345678901291
> +/mnt/scratch/testdir/123456789012345678901292
> +/mnt/scratch/testdir/123456789012345678901293
> +/mnt/scratch/testdir/123456789012345678901294
> +/mnt/scratch/testdir/123456789012345678901295
> +/mnt/scratch/testdir/123456789012345678901296
> +/mnt/scratch/testdir/123456789012345678901297
> +/mnt/scratch/testdir/123456789012345678901298
> +/mnt/scratch/testdir/123456789012345678901299
> +/mnt/scratch/testdir/123456789012345678901300
> +/mnt/scratch/testdir/123456789012345678901301
> +/mnt/scratch/testdir/123456789012345678901302
> +/mnt/scratch/testdir/123456789012345678901303
> +/mnt/scratch/testdir/123456789012345678901304
> +/mnt/scratch/testdir/123456789012345678901305
> +/mnt/scratch/testdir/123456789012345678901306
> +/mnt/scratch/testdir/123456789012345678901307
> +/mnt/scratch/testdir/123456789012345678901308
> +/mnt/scratch/testdir/123456789012345678901309
> +/mnt/scratch/testdir/123456789012345678901310
> +/mnt/scratch/testdir/123456789012345678901311
> +/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
> +/mnt/scratch/testdir/123456789012345678901317
> +/mnt/scratch/testdir/123456789012345678901318
> +/mnt/scratch/testdir/123456789012345678901319
> +/mnt/scratch/testdir/123456789012345678901320
> +/mnt/scratch/testdir/123456789012345678901321
> +/mnt/scratch/testdir/123456789012345678901322
> +/mnt/scratch/testdir/123456789012345678901323
> +/mnt/scratch/testdir/123456789012345678901324
> +/mnt/scratch/testdir/123456789012345678901325
> +/mnt/scratch/testdir/123456789012345678901326
> +/mnt/scratch/testdir/123456789012345678901327
> +/mnt/scratch/testdir/123456789012345678901328
> +/mnt/scratch/testdir/123456789012345678901329
> +/mnt/scratch/testdir/123456789012345678901330
> +/mnt/scratch/testdir/123456789012345678901331
> +/mnt/scratch/testdir/123456789012345678901332
> +/mnt/scratch/testdir/123456789012345678901333
> +/mnt/scratch/testdir/123456789012345678901334
> +/mnt/scratch/testdir/123456789012345678901335
> +/mnt/scratch/testdir/123456789012345678901336
> +/mnt/scratch/testdir/123456789012345678901337
> +/mnt/scratch/testdir/123456789012345678901338
> +/mnt/scratch/testdir/123456789012345678901339
> +/mnt/scratch/testdir/123456789012345678901340
> +/mnt/scratch/testdir/123456789012345678901341
> +/mnt/scratch/testdir/123456789012345678901342
> +/mnt/scratch/testdir/123456789012345678901343
> +/mnt/scratch/testdir/123456789012345678901344
> +/mnt/scratch/testdir/123456789012345678901345
> +/mnt/scratch/testdir/123456789012345678901346
> +/mnt/scratch/testdir/123456789012345678901347
> +/mnt/scratch/testdir/123456789012345678901348
> +/mnt/scratch/testdir/123456789012345678901349
> +/mnt/scratch/testdir/123456789012345678901350
> +/mnt/scratch/testdir/123456789012345678901351
> +/mnt/scratch/testdir/123456789012345678901352
> +/mnt/scratch/testdir/123456789012345678901353
> +/mnt/scratch/testdir/123456789012345678901354
> +/mnt/scratch/testdir/123456789012345678901355
> +/mnt/scratch/testdir/123456789012345678901356
> +/mnt/scratch/testdir/123456789012345678901357
> +/mnt/scratch/testdir/123456789012345678901358
> +/mnt/scratch/testdir/123456789012345678901359
> +/mnt/scratch/testdir/123456789012345678901360
> +/mnt/scratch/testdir/123456789012345678901361
> +/mnt/scratch/testdir/123456789012345678901362
> +/mnt/scratch/testdir/123456789012345678901363
> +/mnt/scratch/testdir/123456789012345678901364
> +/mnt/scratch/testdir/123456789012345678901365
> +/mnt/scratch/testdir/123456789012345678901366
> +/mnt/scratch/testdir/123456789012345678901367
> +/mnt/scratch/testdir/123456789012345678901368
> +/mnt/scratch/testdir/123456789012345678901369
> +/mnt/scratch/testdir/123456789012345678901370
> +/mnt/scratch/testdir/123456789012345678901371
> +/mnt/scratch/testdir/123456789012345678901372
> +/mnt/scratch/testdir/123456789012345678901373
> +/mnt/scratch/testdir/123456789012345678901374
> +/mnt/scratch/testdir/123456789012345678901375
> +/mnt/scratch/testdir/123456789012345678901376
> +/mnt/scratch/testdir/123456789012345678901377
> +/mnt/scratch/testdir/123456789012345678901378
> +/mnt/scratch/testdir/123456789012345678901379
> +/mnt/scratch/testdir/123456789012345678901380
> +/mnt/scratch/testdir/123456789012345678901381
> +/mnt/scratch/testdir/123456789012345678901382
> +/mnt/scratch/testdir/123456789012345678901383
> +/mnt/scratch/testdir/123456789012345678901384
> +/mnt/scratch/testdir/123456789012345678901385
> +/mnt/scratch/testdir/123456789012345678901386
> +/mnt/scratch/testdir/123456789012345678901387
> +/mnt/scratch/testdir/123456789012345678901388
> +/mnt/scratch/testdir/123456789012345678901389
> +/mnt/scratch/testdir/123456789012345678901390
> +/mnt/scratch/testdir/123456789012345678901391
> +/mnt/scratch/testdir/123456789012345678901392
> +/mnt/scratch/testdir/123456789012345678901393
> +/mnt/scratch/testdir/123456789012345678901394
> +/mnt/scratch/testdir/123456789012345678901395
> +/mnt/scratch/testdir/123456789012345678901396
> +/mnt/scratch/testdir/123456789012345678901397
> +/mnt/scratch/testdir/123456789012345678901398
> +/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?

--D

>  349 dangerous_fuzzers scrub
>  350 dangerous_fuzzers dangerous_scrub dangerous_repair
>  351 dangerous_fuzzers dangerous_scrub dangerous_online_repair
> 
> --
> To unsubscribe from this list: send the line "unsubscribe fstests" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH] xfs/288: test fragmented multi-fsb readdir
  2017-04-13 22:34 ` Darrick J. Wong
@ 2017-04-13 22:41   ` Eric Sandeen
  0 siblings, 0 replies; 14+ messages in thread
From: Eric Sandeen @ 2017-04-13 22:41 UTC (permalink / raw)
  To: Darrick J. Wong; +Cc: fstests

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 <sandeen@redhat.com>
>> ---
>>
>> 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 <sandeen@redhat.com>
>> +#
>> +# 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

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH] xfs/288: test fragmented multi-fsb readdir
  2017-04-13 20:28 [PATCH] xfs/288: test fragmented multi-fsb readdir Eric Sandeen
  2017-04-13 22:34 ` Darrick J. Wong
@ 2017-04-13 22:49 ` Eric Sandeen
  2017-04-14  3:50 ` Eryu Guan
  2017-05-04  0:21 ` [PATCH V2] xfs/289: " Eric Sandeen
  3 siblings, 0 replies; 14+ messages in thread
From: Eric Sandeen @ 2017-04-13 22:49 UTC (permalink / raw)
  To: fstests

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 <sandeen@redhat.com>
> ---
> 
> 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

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH] xfs/288: test fragmented multi-fsb readdir
  2017-04-13 20:28 [PATCH] xfs/288: test fragmented multi-fsb readdir Eric Sandeen
  2017-04-13 22:34 ` Darrick J. Wong
  2017-04-13 22:49 ` Eric Sandeen
@ 2017-04-14  3:50 ` Eryu Guan
  2017-05-04  0:21 ` [PATCH V2] xfs/289: " Eric Sandeen
  3 siblings, 0 replies; 14+ messages in thread
From: Eryu Guan @ 2017-04-14  3:50 UTC (permalink / raw)
  To: Eric Sandeen; +Cc: fstests

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 <sandeen@redhat.com>
> ---
> 
> 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 <sandeen@redhat.com>
> +#
> +# 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

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [PATCH V2] xfs/289: test fragmented multi-fsb readdir
  2017-04-13 20:28 [PATCH] xfs/288: test fragmented multi-fsb readdir Eric Sandeen
                   ` (2 preceding siblings ...)
  2017-04-14  3:50 ` Eryu Guan
@ 2017-05-04  0:21 ` Eric Sandeen
  2017-05-19  2:43   ` Xiao Yang
  3 siblings, 1 reply; 14+ messages in thread
From: Eric Sandeen @ 2017-05-04  0:21 UTC (permalink / raw)
  To: fstests, Zorro Lang

Regression test for kernel commit:
023cc840 xfs: handle array index overrun in xfs_dir2_leaf_readbuf()

See commit for detailed problem description.

tl;dr: readahead on weirdly fragmented multi-block directories
was broken.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

V2: address most review comments, esp. nuking ginormous .out
file, but kept touch vs. echo, because echo allocates
1 byte -> 1 block and throws off all
the space calibration.  Still runs in 28s here.

288->289.

Thanks,
-Eric

diff --git a/tests/xfs/289 b/tests/xfs/289
new file mode 100755
index 0000000..86e3dd6
--- /dev/null
+++ b/tests/xfs/289
@@ -0,0 +1,118 @@
+#! /bin/bash
+# FS QA Test 289
+#
+# 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 <sandeen@redhat.com>
+#
+# 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 mkfs with a very specific geometry
+MKFS_OPTIONS=""
+_scratch_mkfs "-d size=512m -n size=8192 -i size=1024" >> $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_PROG -f -c "falloc 0 400m" $SCRATCH_MNT/fillfile ||
+	_fail "Could not allocate space"
+
+# File to fragment:
+$XFS_IO_PROG -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 >> $seqres.full 2>&1
+
+# Punching might have freed up large-ish swaths of metadata
+# Consume hopefully any remaining contiguous freespace
+# (and then some for good measure)
+dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64 >> $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 | sort | _filter_scratch | md5sum
+
+status=0
+exit
diff --git a/tests/xfs/289.out b/tests/xfs/289.out
new file mode 100644
index 0000000..35f8c5e
--- /dev/null
+++ b/tests/xfs/289.out
@@ -0,0 +1,2 @@
+QA output created by 289
+23accd029fad51ec02e4ec1f24799878  -
diff --git a/tests/xfs/group b/tests/xfs/group
index 75769f9..1b7046b 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
+289 auto dir metadata dangerous
 290 auto rw prealloc quick ioctl zero
 291 auto repair
 292 auto mkfs quick



^ permalink raw reply related	[flat|nested] 14+ messages in thread

* Re: [PATCH V2] xfs/289: test fragmented multi-fsb readdir
  2017-05-04  0:21 ` [PATCH V2] xfs/289: " Eric Sandeen
@ 2017-05-19  2:43   ` Xiao Yang
  2017-05-19  3:30     ` Eric Sandeen
  0 siblings, 1 reply; 14+ messages in thread
From: Xiao Yang @ 2017-05-19  2:43 UTC (permalink / raw)
  To: Eric Sandeen, Eryu Guan; +Cc: fstests, Zorro Lang

Hi Eric and Eryu

I tested it on RHE7.3GA and RHEL7.4Alpha, i got ENOSPC error instead of 
hang.  Is it expected behavior?

Please see the following detailed message:
=================================================================================
[root@RHEL7U4Alpha_Intel64 xfstests]# ./check xfs/294
FSTYP         -- xfs (non-debug)
PLATFORM      -- Linux/x86_64 RHEL7U4Alpha_Intel64 3.10.0-657.el7.x86_64
MKFS_OPTIONS  -- -f -bsize=4096 /dev/sda11
MOUNT_OPTIONS -- -o context=system_u:object_r:root_t:s0 /dev/sda11 
/mnt/xfstests/scratch

xfs/294 10s ... - output mismatch (see 
/var/lib/xfstests/results//xfs/294.out.bad)
     --- tests/xfs/294.out    2017-05-19 10:39:31.798010275 +0800
     +++ /var/lib/xfstests/results//xfs/294.out.bad    2017-05-19 
10:40:02.112008755 +0800
     @@ -1,2 +1,1234 @@
      QA output created by 294
     -23accd029fad51ec02e4ec1f24799878  -
     +touch: cannot touch 
'/mnt/xfstests/scratch/testdir/12345678901234567890169': No space left 
on device
     +touch: cannot touch 
'/mnt/xfstests/scratch/testdir/12345678901234567890170': No space left 
on device
     +touch: cannot touch 
'/mnt/xfstests/scratch/testdir/12345678901234567890171': No space left 
on device
     +touch: cannot touch 
'/mnt/xfstests/scratch/testdir/12345678901234567890172': No space left 
on device
     +touch: cannot touch 
'/mnt/xfstests/scratch/testdir/12345678901234567890173': No space left 
on device
     ...
     (Run 'diff -u tests/xfs/294.out 
/var/lib/xfstests/results//xfs/294.out.bad'  to see the entire diff)
Ran: xfs/294
Failures: xfs/294
Failed 1 of 1 tests
=================================================================================

Thanks,
Xiao Yang
On 2017/05/04 8:21, Eric Sandeen wrote:
> Regression test for kernel commit:
> 023cc840 xfs: handle array index overrun in xfs_dir2_leaf_readbuf()
>
> See commit for detailed problem description.
>
> tl;dr: readahead on weirdly fragmented multi-block directories
> was broken.
>
> Signed-off-by: Eric Sandeen<sandeen@redhat.com>
> ---
>
> V2: address most review comments, esp. nuking ginormous .out
> file, but kept touch vs. echo, because echo allocates
> 1 byte ->  1 block and throws off all
> the space calibration.  Still runs in 28s here.
>
> 288->289.
>
> Thanks,
> -Eric
>
> diff --git a/tests/xfs/289 b/tests/xfs/289
> new file mode 100755
> index 0000000..86e3dd6
> --- /dev/null
> +++ b/tests/xfs/289
> @@ -0,0 +1,118 @@
> +#! /bin/bash
> +# FS QA Test 289
> +#
> +# 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<sandeen@redhat.com>
> +#
> +# 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 mkfs with a very specific geometry
> +MKFS_OPTIONS=""
> +_scratch_mkfs "-d size=512m -n size=8192 -i size=1024">>  $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_PROG -f -c "falloc 0 400m" $SCRATCH_MNT/fillfile ||
> +	_fail "Could not allocate space"
> +
> +# File to fragment:
> +$XFS_IO_PROG -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>>  $seqres.full 2>&1
> +
> +# Punching might have freed up large-ish swaths of metadata
> +# Consume hopefully any remaining contiguous freespace
> +# (and then some for good measure)
> +dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64>>  $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 | sort | _filter_scratch | md5sum
> +
> +status=0
> +exit
> diff --git a/tests/xfs/289.out b/tests/xfs/289.out
> new file mode 100644
> index 0000000..35f8c5e
> --- /dev/null
> +++ b/tests/xfs/289.out
> @@ -0,0 +1,2 @@
> +QA output created by 289
> +23accd029fad51ec02e4ec1f24799878  -
> diff --git a/tests/xfs/group b/tests/xfs/group
> index 75769f9..1b7046b 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
> +289 auto dir metadata dangerous
>   290 auto rw prealloc quick ioctl zero
>   291 auto repair
>   292 auto mkfs quick
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe fstests" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>
> .
>




^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH V2] xfs/289: test fragmented multi-fsb readdir
  2017-05-19  2:43   ` Xiao Yang
@ 2017-05-19  3:30     ` Eric Sandeen
  2017-05-19 16:39       ` Eric Sandeen
  0 siblings, 1 reply; 14+ messages in thread
From: Eric Sandeen @ 2017-05-19  3:30 UTC (permalink / raw)
  To: Xiao Yang, Eryu Guan; +Cc: fstests, Zorro Lang



On 5/18/17 9:43 PM, Xiao Yang wrote:
> Hi Eric and Eryu
> 
> I tested it on RHE7.3GA and RHEL7.4Alpha, i got ENOSPC error instead of hang.  Is it expected behavior?
> 
> Please see the following detailed message:
> =================================================================================
> [root@RHEL7U4Alpha_Intel64 xfstests]# ./check xfs/294
> FSTYP         -- xfs (non-debug)
> PLATFORM      -- Linux/x86_64 RHEL7U4Alpha_Intel64 3.10.0-657.el7.x86_64
> MKFS_OPTIONS  -- -f -bsize=4096 /dev/sda11
> MOUNT_OPTIONS -- -o context=system_u:object_r:root_t:s0 /dev/sda11 /mnt/xfstests/scratch
> 
> xfs/294 10s ... - output mismatch (see /var/lib/xfstests/results//xfs/294.out.bad)
>     --- tests/xfs/294.out    2017-05-19 10:39:31.798010275 +0800
>     +++ /var/lib/xfstests/results//xfs/294.out.bad    2017-05-19 10:40:02.112008755 +0800
>     @@ -1,2 +1,1234 @@
>      QA output created by 294
>     -23accd029fad51ec02e4ec1f24799878  -
>     +touch: cannot touch '/mnt/xfstests/scratch/testdir/12345678901234567890169': No space left on device
>     +touch: cannot touch '/mnt/xfstests/scratch/testdir/12345678901234567890170': No space left on device
>     +touch: cannot touch '/mnt/xfstests/scratch/testdir/12345678901234567890171': No space left on device
>     +touch: cannot touch '/mnt/xfstests/scratch/testdir/12345678901234567890172': No space left on device
>     +touch: cannot touch '/mnt/xfstests/scratch/testdir/12345678901234567890173': No space left on device
>     ...
>     (Run 'diff -u tests/xfs/294.out /var/lib/xfstests/results//xfs/294.out.bad'  to see the entire diff)

That's an odd failure; I wrote the test for upstream...

On that kernel, despite free inodes:

# df -i /mnt/scratch
Filesystem     Inodes IUsed IFree IUse% Mounted on
/dev/loop1      10260   490  9770    5% /mnt/scratch

and xfs_db concurs (more or less?):

icount = 10240
ifree = 9750

creating a new inode fails:

# touch /mnt/scratch/testdir/12345678901234567890169
touch: cannot touch ‘/mnt/scratch/testdir/12345678901234567890169’: No space left on device

Everything about the fs looks the same as if we run it upstream, including
the reserved blocks:

reserved blocks = 6553
available reserved blocks = 6553

But, it's failing to allocate the space:

           touch-12302 [005] d... 118038.499302: ret_xfs_mod_fdblocks: (xfs_trans_reserve+0x123/0x200 [xfs] <- xfs_mod_fdblocks) arg1=0xffffffe4

(arg1 is the return value, -ENOSPC)

It's not clear to me at this point why we can't create another inode on this fs.

-Eric


^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH V2] xfs/289: test fragmented multi-fsb readdir
  2017-05-19  3:30     ` Eric Sandeen
@ 2017-05-19 16:39       ` Eric Sandeen
  2017-05-20  2:25         ` Eric Sandeen
  0 siblings, 1 reply; 14+ messages in thread
From: Eric Sandeen @ 2017-05-19 16:39 UTC (permalink / raw)
  To: Xiao Yang, Eryu Guan; +Cc: fstests, Zorro Lang

On 5/18/17 10:30 PM, Eric Sandeen wrote:

> 
> That's an odd failure; I wrote the test for upstream...
> 
> On that kernel, despite free inodes:
> 
> # df -i /mnt/scratch
> Filesystem     Inodes IUsed IFree IUse% Mounted on
> /dev/loop1      10260   490  9770    5% /mnt/scratch
> 
> and xfs_db concurs (more or less?):
> 
> icount = 10240
> ifree = 9750
> 
> creating a new inode fails:
> 
> # touch /mnt/scratch/testdir/12345678901234567890169
> touch: cannot touch ‘/mnt/scratch/testdir/12345678901234567890169’: No space left on device
> 
> Everything about the fs looks the same as if we run it upstream, including
> the reserved blocks:
> 
> reserved blocks = 6553
> available reserved blocks = 6553
> 
> But, it's failing to allocate the space:
> 
>            touch-12302 [005] d... 118038.499302: ret_xfs_mod_fdblocks: (xfs_trans_reserve+0x123/0x200 [xfs] <- xfs_mod_fdblocks) arg1=0xffffffe4
> 
> (arg1 is the return value, -ENOSPC)
> 
> It's not clear to me at this point why we can't create another inode on this fs.

Ugh, I can't believe I missed this - I actually didn't do anything to ensure that
there is free space to grow the actual directory into.

If I add this just prior to the last 1300-file touch loop:

./src/punch-alternating $SCRATCH_MNT/spacefile1 >> $seqres.full 2>&1

that seems to let the test proceed w/o ENOSPC, and properly fragment the
dir.

(OTOH upstream, now the test is reporting fs corruption, though I don't
see it after the test completes.  Very confused now.  It might be
confusing xfs_check?  Repair is happy...)

I'm still not sure why the rhel kernel differs from upstream, though.

-Eric

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH V2] xfs/289: test fragmented multi-fsb readdir
  2017-05-19 16:39       ` Eric Sandeen
@ 2017-05-20  2:25         ` Eric Sandeen
  2017-06-15  8:12           ` Xiao Yang
  0 siblings, 1 reply; 14+ messages in thread
From: Eric Sandeen @ 2017-05-20  2:25 UTC (permalink / raw)
  To: Xiao Yang, Eryu Guan; +Cc: fstests, Zorro Lang



On 5/19/17 11:39 AM, Eric Sandeen wrote:
> On 5/18/17 10:30 PM, Eric Sandeen wrote:
> 
>>
>> That's an odd failure; I wrote the test for upstream...
>>
>> On that kernel, despite free inodes:
>>
>> # df -i /mnt/scratch
>> Filesystem     Inodes IUsed IFree IUse% Mounted on
>> /dev/loop1      10260   490  9770    5% /mnt/scratch
>>
>> and xfs_db concurs (more or less?):
>>
>> icount = 10240
>> ifree = 9750
>>
>> creating a new inode fails:
>>
>> # touch /mnt/scratch/testdir/12345678901234567890169
>> touch: cannot touch ‘/mnt/scratch/testdir/12345678901234567890169’: No space left on device
>>
>> Everything about the fs looks the same as if we run it upstream, including
>> the reserved blocks:
>>
>> reserved blocks = 6553
>> available reserved blocks = 6553
>>
>> But, it's failing to allocate the space:
>>
>>            touch-12302 [005] d... 118038.499302: ret_xfs_mod_fdblocks: (xfs_trans_reserve+0x123/0x200 [xfs] <- xfs_mod_fdblocks) arg1=0xffffffe4
>>
>> (arg1 is the return value, -ENOSPC)
>>
>> It's not clear to me at this point why we can't create another inode on this fs.
> 
> Ugh, I can't believe I missed this - I actually didn't do anything to ensure that
> there is free space to grow the actual directory into.
> 
> If I add this just prior to the last 1300-file touch loop:
> 
> ./src/punch-alternating $SCRATCH_MNT/spacefile1 >> $seqres.full 2>&1
> 
> that seems to let the test proceed w/o ENOSPC, and properly fragment the
> dir.
> 
> (OTOH upstream, now the test is reporting fs corruption, though I don't
> see it after the test completes.  Very confused now.  It might be
> confusing xfs_check?  Repair is happy...)
> 
> I'm still not sure why the rhel kernel differs from upstream, though.

The more I look at this, the more I realize how fragile the test is.  It's
trying to control allocation, which is almost nearly impossible to do
reliably in a test.

I'm not quite sure how to make this one better...

-Eric

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH V2] xfs/289: test fragmented multi-fsb readdir
  2017-05-20  2:25         ` Eric Sandeen
@ 2017-06-15  8:12           ` Xiao Yang
  2017-06-15 14:19             ` Eric Sandeen
  0 siblings, 1 reply; 14+ messages in thread
From: Xiao Yang @ 2017-06-15  8:12 UTC (permalink / raw)
  To: Eric Sandeen; +Cc: Eryu Guan, fstests, Zorro Lang

On 2017/05/20 10:25, Eric Sandeen wrote:
>
> On 5/19/17 11:39 AM, Eric Sandeen wrote:
>> On 5/18/17 10:30 PM, Eric Sandeen wrote:
>>
>>> That's an odd failure; I wrote the test for upstream...
>>>
>>> On that kernel, despite free inodes:
>>>
>>> # df -i /mnt/scratch
>>> Filesystem     Inodes IUsed IFree IUse% Mounted on
>>> /dev/loop1      10260   490  9770    5% /mnt/scratch
>>>
>>> and xfs_db concurs (more or less?):
>>>
>>> icount = 10240
>>> ifree = 9750
>>>
>>> creating a new inode fails:
>>>
>>> # touch /mnt/scratch/testdir/12345678901234567890169
>>> touch: cannot touch ‘/mnt/scratch/testdir/12345678901234567890169’: No space left on device
>>>
>>> Everything about the fs looks the same as if we run it upstream, including
>>> the reserved blocks:
>>>
>>> reserved blocks = 6553
>>> available reserved blocks = 6553
>>>
>>> But, it's failing to allocate the space:
>>>
>>>             touch-12302 [005] d... 118038.499302: ret_xfs_mod_fdblocks: (xfs_trans_reserve+0x123/0x200 [xfs]<- xfs_mod_fdblocks) arg1=0xffffffe4
>>>
>>> (arg1 is the return value, -ENOSPC)
>>>
>>> It's not clear to me at this point why we can't create another inode on this fs.
>> Ugh, I can't believe I missed this - I actually didn't do anything to ensure that
>> there is free space to grow the actual directory into.
>>
>> If I add this just prior to the last 1300-file touch loop:
>>
>> ./src/punch-alternating $SCRATCH_MNT/spacefile1>>  $seqres.full 2>&1
>>
>> that seems to let the test proceed w/o ENOSPC, and properly fragment the
>> dir.
>>
>> (OTOH upstream, now the test is reporting fs corruption, though I don't
>> see it after the test completes.  Very confused now.  It might be
>> confusing xfs_check?  Repair is happy...)
>>
>> I'm still not sure why the rhel kernel differs from upstream, though.
> The more I look at this, the more I realize how fragile the test is.  It's
> trying to control allocation, which is almost nearly impossible to do
> reliably in a test.
>
> I'm not quite sure how to make this one better...
Hi Eric

Sorry for the late reply.

Firstly, The following command works abnormally on RHEL7.3 and RHEL7.4.
dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64

If bs is set to 1M and the remaining freespace is less than 1M, dd could not write any data
into spacefile2.  However, it still writes data into spacefile2 and leads that there is no
enough free space to grow the actual directory.

Secondly, I tested this case with upstream kernel in RHEL7.3 on virtual machine, but i awlays don't
trigger this bug.  Is there some specific settings?

Could we use the following command to consume a lot of remaining free space, but reserve
some free space to create the last 1300-file:
dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1K count=35000

I am not sure if this change can still trigger kernel bug.  :-)

Thanks
Xiao Yang.
> -Eric
>
>
> .
>




^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH V2] xfs/289: test fragmented multi-fsb readdir
  2017-06-15  8:12           ` Xiao Yang
@ 2017-06-15 14:19             ` Eric Sandeen
  2017-06-15 16:30               ` Darrick J. Wong
  0 siblings, 1 reply; 14+ messages in thread
From: Eric Sandeen @ 2017-06-15 14:19 UTC (permalink / raw)
  To: Xiao Yang; +Cc: Eryu Guan, fstests, Zorro Lang

On 6/15/17 3:12 AM, Xiao Yang wrote:
> On 2017/05/20 10:25, Eric Sandeen wrote:
>>
>> On 5/19/17 11:39 AM, Eric Sandeen wrote:
>>> On 5/18/17 10:30 PM, Eric Sandeen wrote:
>>>
>>>> That's an odd failure; I wrote the test for upstream...
>>>>
>>>> On that kernel, despite free inodes:
>>>>
>>>> # df -i /mnt/scratch
>>>> Filesystem     Inodes IUsed IFree IUse% Mounted on
>>>> /dev/loop1      10260   490  9770    5% /mnt/scratch
>>>>
>>>> and xfs_db concurs (more or less?):
>>>>
>>>> icount = 10240
>>>> ifree = 9750
>>>>
>>>> creating a new inode fails:
>>>>
>>>> # touch /mnt/scratch/testdir/12345678901234567890169
>>>> touch: cannot touch ‘/mnt/scratch/testdir/12345678901234567890169’: No space left on device
>>>>
>>>> Everything about the fs looks the same as if we run it upstream, including
>>>> the reserved blocks:
>>>>
>>>> reserved blocks = 6553
>>>> available reserved blocks = 6553
>>>>
>>>> But, it's failing to allocate the space:
>>>>
>>>>             touch-12302 [005] d... 118038.499302: ret_xfs_mod_fdblocks: (xfs_trans_reserve+0x123/0x200 [xfs]<- xfs_mod_fdblocks) arg1=0xffffffe4
>>>>
>>>> (arg1 is the return value, -ENOSPC)
>>>>
>>>> It's not clear to me at this point why we can't create another inode on this fs.
>>> Ugh, I can't believe I missed this - I actually didn't do anything to ensure that
>>> there is free space to grow the actual directory into.
>>>
>>> If I add this just prior to the last 1300-file touch loop:
>>>
>>> ./src/punch-alternating $SCRATCH_MNT/spacefile1>>  $seqres.full 2>&1
>>>
>>> that seems to let the test proceed w/o ENOSPC, and properly fragment the
>>> dir.
>>>
>>> (OTOH upstream, now the test is reporting fs corruption, though I don't
>>> see it after the test completes.  Very confused now.  It might be
>>> confusing xfs_check?  Repair is happy...)
>>>
>>> I'm still not sure why the rhel kernel differs from upstream, though.
>> The more I look at this, the more I realize how fragile the test is.  It's
>> trying to control allocation, which is almost nearly impossible to do
>> reliably in a test.
>>
>> I'm not quite sure how to make this one better...
> Hi Eric
> 
> Sorry for the late reply.
> 
> Firstly, The following command works abnormally on RHEL7.3 and RHEL7.4.
> dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64
> 
> If bs is set to 1M and the remaining freespace is less than 1M, dd could not write any data
> into spacefile2.  However, it still writes data into spacefile2 and leads that there is no
> enough free space to grow the actual directory.
> 
> Secondly, I tested this case with upstream kernel in RHEL7.3 on virtual machine, but i awlays don't
> trigger this bug.  Is there some specific settings?
> 
> Could we use the following command to consume a lot of remaining free space, but reserve
> some free space to create the last 1300-file:
> dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1K count=35000
> 
> I am not sure if this change can still trigger kernel bug.  :-)

Honestly, I think this test should probably be removed.  It's trying too hard to
control allocation behavior, which is not possible in general.

The only other approach I can think of is to create a lot of one-block files,
map them all, and then decide which ones to remove (or perhaps better, truncate to
0 length) in an effort to create perfectly fragmented freespace.  At least that
way we would not be trying control or expect allocation patterns ahead of time.

-Eric

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH V2] xfs/289: test fragmented multi-fsb readdir
  2017-06-15 14:19             ` Eric Sandeen
@ 2017-06-15 16:30               ` Darrick J. Wong
  2017-06-15 16:41                 ` Eric Sandeen
  0 siblings, 1 reply; 14+ messages in thread
From: Darrick J. Wong @ 2017-06-15 16:30 UTC (permalink / raw)
  To: Eric Sandeen; +Cc: Xiao Yang, Eryu Guan, fstests, Zorro Lang

On Thu, Jun 15, 2017 at 09:19:44AM -0500, Eric Sandeen wrote:
> On 6/15/17 3:12 AM, Xiao Yang wrote:
> > On 2017/05/20 10:25, Eric Sandeen wrote:
> >>
> >> On 5/19/17 11:39 AM, Eric Sandeen wrote:
> >>> On 5/18/17 10:30 PM, Eric Sandeen wrote:
> >>>
> >>>> That's an odd failure; I wrote the test for upstream...
> >>>>
> >>>> On that kernel, despite free inodes:
> >>>>
> >>>> # df -i /mnt/scratch
> >>>> Filesystem     Inodes IUsed IFree IUse% Mounted on
> >>>> /dev/loop1      10260   490  9770    5% /mnt/scratch
> >>>>
> >>>> and xfs_db concurs (more or less?):
> >>>>
> >>>> icount = 10240
> >>>> ifree = 9750
> >>>>
> >>>> creating a new inode fails:
> >>>>
> >>>> # touch /mnt/scratch/testdir/12345678901234567890169
> >>>> touch: cannot touch ‘/mnt/scratch/testdir/12345678901234567890169’: No space left on device
> >>>>
> >>>> Everything about the fs looks the same as if we run it upstream, including
> >>>> the reserved blocks:
> >>>>
> >>>> reserved blocks = 6553
> >>>> available reserved blocks = 6553
> >>>>
> >>>> But, it's failing to allocate the space:
> >>>>
> >>>>             touch-12302 [005] d... 118038.499302: ret_xfs_mod_fdblocks: (xfs_trans_reserve+0x123/0x200 [xfs]<- xfs_mod_fdblocks) arg1=0xffffffe4
> >>>>
> >>>> (arg1 is the return value, -ENOSPC)
> >>>>
> >>>> It's not clear to me at this point why we can't create another inode on this fs.
> >>> Ugh, I can't believe I missed this - I actually didn't do anything to ensure that
> >>> there is free space to grow the actual directory into.
> >>>
> >>> If I add this just prior to the last 1300-file touch loop:
> >>>
> >>> ./src/punch-alternating $SCRATCH_MNT/spacefile1>>  $seqres.full 2>&1
> >>>
> >>> that seems to let the test proceed w/o ENOSPC, and properly fragment the
> >>> dir.
> >>>
> >>> (OTOH upstream, now the test is reporting fs corruption, though I don't
> >>> see it after the test completes.  Very confused now.  It might be
> >>> confusing xfs_check?  Repair is happy...)
> >>>
> >>> I'm still not sure why the rhel kernel differs from upstream, though.
> >> The more I look at this, the more I realize how fragile the test is.  It's
> >> trying to control allocation, which is almost nearly impossible to do
> >> reliably in a test.
> >>
> >> I'm not quite sure how to make this one better...
> > Hi Eric
> > 
> > Sorry for the late reply.
> > 
> > Firstly, The following command works abnormally on RHEL7.3 and RHEL7.4.
> > dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64
> > 
> > If bs is set to 1M and the remaining freespace is less than 1M, dd could not write any data
> > into spacefile2.  However, it still writes data into spacefile2 and leads that there is no
> > enough free space to grow the actual directory.
> > 
> > Secondly, I tested this case with upstream kernel in RHEL7.3 on virtual machine, but i awlays don't
> > trigger this bug.  Is there some specific settings?
> > 
> > Could we use the following command to consume a lot of remaining free space, but reserve
> > some free space to create the last 1300-file:
> > dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1K count=35000
> > 
> > I am not sure if this change can still trigger kernel bug.  :-)
> 
> Honestly, I think this test should probably be removed.  It's trying too hard to
> control allocation behavior, which is not possible in general.
> 
> The only other approach I can think of is to create a lot of one-block files,
> map them all, and then decide which ones to remove (or perhaps better, truncate to
> 0 length) in an effort to create perfectly fragmented freespace.  At least that
> way we would not be trying control or expect allocation patterns ahead of time.

<shrug> There are common/ helpers to fill up a filesystem, why not
use that instead of open-coding it?

This test uncovered a somewhat obscure corruption bug, which to me
argues for /not/ kicking this one out.

--D

> 
> -Eric
> --
> To unsubscribe from this list: send the line "unsubscribe fstests" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 14+ messages in thread

* Re: [PATCH V2] xfs/289: test fragmented multi-fsb readdir
  2017-06-15 16:30               ` Darrick J. Wong
@ 2017-06-15 16:41                 ` Eric Sandeen
  0 siblings, 0 replies; 14+ messages in thread
From: Eric Sandeen @ 2017-06-15 16:41 UTC (permalink / raw)
  To: Darrick J. Wong; +Cc: Xiao Yang, Eryu Guan, fstests, Zorro Lang

On 6/15/17 11:30 AM, Darrick J. Wong wrote:
> On Thu, Jun 15, 2017 at 09:19:44AM -0500, Eric Sandeen wrote:
>> On 6/15/17 3:12 AM, Xiao Yang wrote:
>>> On 2017/05/20 10:25, Eric Sandeen wrote:
>>>>
>>>> On 5/19/17 11:39 AM, Eric Sandeen wrote:
>>>>> On 5/18/17 10:30 PM, Eric Sandeen wrote:
>>>>>
>>>>>> That's an odd failure; I wrote the test for upstream...
>>>>>>
>>>>>> On that kernel, despite free inodes:
>>>>>>
>>>>>> # df -i /mnt/scratch
>>>>>> Filesystem     Inodes IUsed IFree IUse% Mounted on
>>>>>> /dev/loop1      10260   490  9770    5% /mnt/scratch
>>>>>>
>>>>>> and xfs_db concurs (more or less?):
>>>>>>
>>>>>> icount = 10240
>>>>>> ifree = 9750
>>>>>>
>>>>>> creating a new inode fails:
>>>>>>
>>>>>> # touch /mnt/scratch/testdir/12345678901234567890169
>>>>>> touch: cannot touch ‘/mnt/scratch/testdir/12345678901234567890169’: No space left on device
>>>>>>
>>>>>> Everything about the fs looks the same as if we run it upstream, including
>>>>>> the reserved blocks:
>>>>>>
>>>>>> reserved blocks = 6553
>>>>>> available reserved blocks = 6553
>>>>>>
>>>>>> But, it's failing to allocate the space:
>>>>>>
>>>>>>             touch-12302 [005] d... 118038.499302: ret_xfs_mod_fdblocks: (xfs_trans_reserve+0x123/0x200 [xfs]<- xfs_mod_fdblocks) arg1=0xffffffe4
>>>>>>
>>>>>> (arg1 is the return value, -ENOSPC)
>>>>>>
>>>>>> It's not clear to me at this point why we can't create another inode on this fs.
>>>>> Ugh, I can't believe I missed this - I actually didn't do anything to ensure that
>>>>> there is free space to grow the actual directory into.
>>>>>
>>>>> If I add this just prior to the last 1300-file touch loop:
>>>>>
>>>>> ./src/punch-alternating $SCRATCH_MNT/spacefile1>>  $seqres.full 2>&1
>>>>>
>>>>> that seems to let the test proceed w/o ENOSPC, and properly fragment the
>>>>> dir.
>>>>>
>>>>> (OTOH upstream, now the test is reporting fs corruption, though I don't
>>>>> see it after the test completes.  Very confused now.  It might be
>>>>> confusing xfs_check?  Repair is happy...)
>>>>>
>>>>> I'm still not sure why the rhel kernel differs from upstream, though.
>>>> The more I look at this, the more I realize how fragile the test is.  It's
>>>> trying to control allocation, which is almost nearly impossible to do
>>>> reliably in a test.
>>>>
>>>> I'm not quite sure how to make this one better...
>>> Hi Eric
>>>
>>> Sorry for the late reply.
>>>
>>> Firstly, The following command works abnormally on RHEL7.3 and RHEL7.4.
>>> dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64
>>>
>>> If bs is set to 1M and the remaining freespace is less than 1M, dd could not write any data
>>> into spacefile2.  However, it still writes data into spacefile2 and leads that there is no
>>> enough free space to grow the actual directory.
>>>
>>> Secondly, I tested this case with upstream kernel in RHEL7.3 on virtual machine, but i awlays don't
>>> trigger this bug.  Is there some specific settings?
>>>
>>> Could we use the following command to consume a lot of remaining free space, but reserve
>>> some free space to create the last 1300-file:
>>> dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1K count=35000
>>>
>>> I am not sure if this change can still trigger kernel bug.  :-)
>>
>> Honestly, I think this test should probably be removed.  It's trying too hard to
>> control allocation behavior, which is not possible in general.
>>
>> The only other approach I can think of is to create a lot of one-block files,
>> map them all, and then decide which ones to remove (or perhaps better, truncate to
>> 0 length) in an effort to create perfectly fragmented freespace.  At least that
>> way we would not be trying control or expect allocation patterns ahead of time.
> 
> <shrug> There are common/ helpers to fill up a filesystem, why not
> use that instead of open-coding it?

Filling a filesystem is not the problem; leaving /only/ discontiguous free blocks
available for directory allocation is the problem...

That was the original goal with the "punch every other (logical) block" but that
wasn't quite sufficient.

> This test uncovered a somewhat obscure corruption bug, which to me
> argues for /not/ kicking this one out.

Well, it was written as a regression test to demonstrate the bug, but it
is not reliably doing so...

It's "failing" due to problems in the test, not due to the bug, so it needs
to be fixed or removed, I think.

-Eric

> --D
> 

^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2017-06-15 16:41 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-04-13 20:28 [PATCH] xfs/288: test fragmented multi-fsb readdir Eric Sandeen
2017-04-13 22:34 ` Darrick J. Wong
2017-04-13 22:41   ` Eric Sandeen
2017-04-13 22:49 ` Eric Sandeen
2017-04-14  3:50 ` Eryu Guan
2017-05-04  0:21 ` [PATCH V2] xfs/289: " Eric Sandeen
2017-05-19  2:43   ` Xiao Yang
2017-05-19  3:30     ` Eric Sandeen
2017-05-19 16:39       ` Eric Sandeen
2017-05-20  2:25         ` Eric Sandeen
2017-06-15  8:12           ` Xiao Yang
2017-06-15 14:19             ` Eric Sandeen
2017-06-15 16:30               ` Darrick J. Wong
2017-06-15 16:41                 ` Eric Sandeen

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