* [Bug 201259] New: [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
@ 2018-09-28 6:06 bugzilla-daemon
2018-10-02 13:53 ` [Bug 201259] " bugzilla-daemon
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0 siblings, 9 replies; 10+ messages in thread
From: bugzilla-daemon @ 2018-09-28 6:06 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
Bug ID: 201259
Summary: [xfstests shared/010]: maybe pagecache contents is
mutated after cycle mount
Product: File System
Version: 2.5
Kernel Version: v4.19-rc5
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: XFS
Assignee: filesystem_xfs@kernel-bugs.kernel.org
Reporter: zlang@redhat.com
Regression: No
Recently, shared/010 sometimes hit below issue:
QA output created by 010
/mnt/scratch/dir/p0/deXXXXXXXXXXX/d218X/d3a0XXX/d3da/d90XXXXXXXXXXXXX/d1c8XXXXXXXXX/d71/d75XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/da6XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/db9XXXX/de0XXXXXXXXXXXXX/d7e0XXXXXXXXXXXX/d1d9X/f476XXXX:
FAILED
md5sum: WARNING: 1 computed checksum did NOT match
Silence is golden
Looks like something changed after cycle mount, cause this integrity issue.
Version-Release number of selected component (if applicable):
kernel v4.19-rc5
How reproducible:
10~30%
Steps to Reproduce:
1) git clone https://github.com/markfasheh/duperemove.git
2) cd duperemove; make; make install
3) Run shared/010 on XFS several times, with reflink=1:
Actual results:
checksum mismatch
Expected results:
test always pass
Additional info:
I can't be sure this's a real bug, maybe it's case issue. But I don't know
what's wrong with the case, so report this bug to get more
reviewing/suggestions from XFS developers. Thanks.
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* [Bug 201259] [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
2018-09-28 6:06 [Bug 201259] New: [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount bugzilla-daemon
@ 2018-10-02 13:53 ` bugzilla-daemon
2018-10-02 13:54 ` bugzilla-daemon
` (7 subsequent siblings)
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From: bugzilla-daemon @ 2018-10-02 13:53 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
Eric Sandeen (sandeen@sandeen.net) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sandeen@sandeen.net
--- Comment #1 from Eric Sandeen (sandeen@sandeen.net) ---
In trying to get to a more targeted reproducer, this script clearly exposes
stale data, though I'm not seeing an md5sum change across the remount. The
operations below are a subset of an fsstress sequence that caused a failure in
shared/010 for me.
---
#!/bin/bash
DEV=/dev/pmem0p2
MNT=/mnt/scratch
umount $MNT
xfs_io -d -c "pwrite -S 0x58 0 16g" $DEV
mkfs.xfs -m reflink=1 $DEV
mount $DEV $MNT
DONOR1=$MNT/donor1
DONOR2=$MNT/donor2
TARGET=$MNT/file
rm -f $DONOR1 $DONOR2 $TARGET
xfs_io -f -c "pwrite -S 0x72 0 1772544" $DONOR1
xfs_io -f -c "pwrite -S 0x52 0 840263" $DONOR2
touch $TARGET
xfs_io -f \
-c "falloc -k 624393 840278" \
-c "reflink $DONOR1 925696 212992 57344" \
-c "pwrite -S 0x57 1662464 74240" \
-c "fdatasync" \
-c "reflink $DONOR2 585728 5357568 122880" \
$TARGET
md5sum $TARGET
umount $MNT
mount $DEV $MNT
md5sum $TARGET
xfs_bmap -vvp $TARGET
hexdump -C $TARGET
---
95580da3cda8eb09c23c8deefb347d77 /mnt/scratch/file
95580da3cda8eb09c23c8deefb347d77 /mnt/scratch/file
/mnt/scratch/file:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL FLAGS
0: [0..415]: hole 416
1: [416..527]: 3648..3759 0 (3648..3759) 112 100000 (first
reflink)
2: [528..1215]: hole 688
3: [1216..2863]: 192..1839 0 (192..1839) 1648 010000
(fallocated)
4: [2864..3239]: hole 376
5: [3240..3455]: 5304..5519 0 (5304..5519) 216 000000
(pwrite)
6: [3456..10463]: hole 7008
7: [10464..10703]: 6664..6903 0 (6664..6903) 240 100000 (2nd
reflink)
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
(hole)
*
00034000 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 |rrrrrrrrrrrrrrrr|
(first reflink)
*
00042000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
(hole + fallocated)
*
00195e00 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 |WWWWWWWWWWWWWWWW|
(pwrite)
*
001a8000 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 |XXXXXXXXXXXXXXXX|
(stale 32k)
*
001b0000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
(hole)
*
0051c000 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 |RRRRRRRRRRRRRRRR|
(2nd reflink)
*
0053a000
the "XXXXXXX" is exposed stale data (no pwrite in the script wrote 'X', that is
the disk pattern)
The pattern starts right after the end of the pwrite call of the script. There
also seems to be a reflinked extent prior to the pwrite.
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* [Bug 201259] [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
2018-09-28 6:06 [Bug 201259] New: [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount bugzilla-daemon
2018-10-02 13:53 ` [Bug 201259] " bugzilla-daemon
@ 2018-10-02 13:54 ` bugzilla-daemon
2018-10-02 16:24 ` bugzilla-daemon
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: bugzilla-daemon @ 2018-10-02 13:54 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
--- Comment #2 from Eric Sandeen (sandeen@sandeen.net) ---
Hrm sorry about the wrap. Also:
> There also seems to be a reflinked extent prior to the pwrite.
That should say "there is an fallocated extent prior to the pwrite"
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* [Bug 201259] [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
2018-09-28 6:06 [Bug 201259] New: [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount bugzilla-daemon
2018-10-02 13:53 ` [Bug 201259] " bugzilla-daemon
2018-10-02 13:54 ` bugzilla-daemon
@ 2018-10-02 16:24 ` bugzilla-daemon
2018-10-02 16:28 ` bugzilla-daemon
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From: bugzilla-daemon @ 2018-10-02 16:24 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
--- Comment #3 from Eric Sandeen (sandeen@sandeen.net) ---
Here's a slightly simpler test on smaller, block boundaries:
xfs_io -f -c "pwrite -S 0x72 0 4096" $DONOR1
xfs_io -f -c "pwrite -S 0x52 0 4096" $DONOR2
xfs_io -f \
-c "falloc -k 8192 4096" \
-c "reflink $DONOR1 0 4096 4096" \
-c "pwrite -S 0x57 65536 8192" \
-c "fdatasync" \
-c "reflink $DONOR2 0 131072 4096" \
$TARGET
By block, it does these operations, all within 32 blocks:
11111111112222222222333
012345678901234567890123456789012
P
R
WW
R
P = preallocate
R = reflink
W = write
What we should get out is:
HRPHHHHHHHHHHHHHWWHHHHHHHHHHHHHHR
H = Hole
What we do get out is:
HRPHHHHHHHHHHHHHWWSSSSSSSSSSSSSSR
S = Stale
The extents:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL FLAGS
0: [0..7]: hole 8
1: [8..15]: 112..119 0 (112..119) 8 100000
2: [16..23]: 104..111 0 (104..111) 8 010000
3: [24..127]: hole 104
4: [128..255]: 216..343 0 (216..343) 128 000000
5: [256..263]: 120..127 0 (120..127) 8 100000
are lined up as (chars represent hole/reflink/prealloc/written/stale)
H R P HHHHHHHHHHHHH WWSSSSSSSSSSSSSS R
[E][E][E][ E ][ E ][E]
So the 5th extent is what has exposed the stale data, with written data only in
the first 2 blocks and another 14 blocks exposed up to the next reflinked
block.
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* [Bug 201259] [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
2018-09-28 6:06 [Bug 201259] New: [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount bugzilla-daemon
` (2 preceding siblings ...)
2018-10-02 16:24 ` bugzilla-daemon
@ 2018-10-02 16:28 ` bugzilla-daemon
2018-10-02 16:37 ` bugzilla-daemon
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From: bugzilla-daemon @ 2018-10-02 16:28 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
--- Comment #4 from Eric Sandeen (sandeen@sandeen.net) ---
If I change the test to mount with -o allocsize=4096, the problem goes away, so
it would appear that this has to do with speculative preallocation past EOF.
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* [Bug 201259] [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
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From: bugzilla-daemon @ 2018-10-02 16:37 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
--- Comment #5 from Eric Sandeen (sandeen@sandeen.net) ---
Even simpler,
xfs_io -f -c "pwrite -S 0x72 0 4096" $DONOR1
xfs_io -f \
-c "falloc -k 8192 4096" \
-c "pwrite -S 0x57 65536 8192" \
-c "fdatasync" \
-c "reflink $DONOR1 0 131072 4096" \
$TARGET
so this seems to be an extending reflink extending past/into speculative
preallocation which exposes the stale blocks.
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* [Bug 201259] [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
2018-09-28 6:06 [Bug 201259] New: [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount bugzilla-daemon
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From: bugzilla-daemon @ 2018-11-03 3:05 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
--- Comment #6 from Zorro Lang (zlang@redhat.com) ---
After upstream merged the patch of this bug, I still can reproduce a shared/010
failure:
FSTYP -- xfs (non-debug)
PLATFORM -- Linux/x86_64 xxxxxxxx 4.19.0+
MKFS_OPTIONS -- -f -m reflink=1 -b size=1024 /dev/mapper/xxxxxxxx-xfscratch
MOUNT_OPTIONS -- -o context=system_u:object_r:root_t:s0
/dev/mapper/xxxxxxxxx-xfscratch /mnt/scratch
shared/010 160s ... - output mismatch (see
/home/xfstests-dev/results//shared/010.out.bad)
--- tests/shared/010.out 2018-10-16 23:31:53.924269141 -0400
+++ /home/xfstests-dev/results//shared/010.out.bad 2018-11-02
12:20:39.858510419 -0400
@@ -1,2 +1,4 @@
QA output created by 010
+/mnt/scratch/dir/p0/da/d51XX/f6dXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX: FAILED
+md5sum: WARNING: 1 computed checksum did NOT match
Silence is golden
...
(Run 'diff -u tests/shared/010.out
/home/xfstests-dev/results//shared/010.out.bad' to see the entire diff)
Ran: shared/010
Failures: shared/010
Failed 1 of 1 tests
But maybe it's a new issue, due to I can't reproduce this bug by the reproducer
on comment#1:
# bash reproducer.sh
umount: /mnt/scratch: not mounted.
wrote 17179869184/17179869184 bytes at offset 0
16.000 GiB, 4194304 ops; 0:16:47.88 (16.256 MiB/sec and 4161.4915 ops/sec)
meta-data=/dev/mapper/xxxxxxxx-xfscratch isize=512 agcount=16,
agsize=8192000 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1
data = bsize=4096 blocks=131072000, imaxpct=25
= sunit=64 swidth=64 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=64000, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
wrote 1772544/1772544 bytes at offset 0
2 MiB, 433 ops; 0.0170 sec (99.111 MiB/sec and 25386.9606 ops/sec)
wrote 840263/840263 bytes at offset 0
821 KiB, 206 ops; 0.0083 sec (96.419 MiB/sec and 24786.4276 ops/sec)
linked 57344/57344 bytes at offset 212992
56 KiB, 1 ops; 0.0030 sec (17.698 MiB/sec and 323.6246 ops/sec)
wrote 74240/74240 bytes at offset 1662464
72 KiB, 19 ops; 0.0010 sec (65.984 MiB/sec and 17707.3625 ops/sec)
linked 122880/122880 bytes at offset 5357568
120 KiB, 1 ops; 0.0037 sec (31.477 MiB/sec and 268.6006 ops/sec)
a42583dd3f7edb0c00e7356c89d3e58c /mnt/scratch/file
a42583dd3f7edb0c00e7356c89d3e58c /mnt/scratch/file
/mnt/scratch/file:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL FLAGS
0: [0..415]: hole 416
1: [416..527]: 4880..4991 0 (4880..4991) 112 101111
2: [528..1215]: hole 688
3: [1216..2863]: 1024..2671 0 (1024..2671) 1648 010101
4: [2864..3239]: hole 376
5: [3240..3583]: 2672..3015 0 (2672..3015) 344 001111
6: [3584..10463]: hole 6880
7: [10464..10703]: 7800..8039 0 (7800..8039) 240 101111
FLAG Values:
0100000 Shared extent
0010000 Unwritten preallocated extent
0001000 Doesn't begin on stripe unit
0000100 Doesn't end on stripe unit
0000010 Doesn't begin on stripe width
0000001 Doesn't end on stripe width
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00034000 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 |rrrrrrrrrrrrrrrr|
*
00042000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00195e00 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 |WWWWWWWWWWWWWWWW|
*
001a8000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
0051c000 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 |RRRRRRRRRRRRRRRR|
*
0053a000
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* [Bug 201259] [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
2018-09-28 6:06 [Bug 201259] New: [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount bugzilla-daemon
` (5 preceding siblings ...)
2018-11-03 3:05 ` bugzilla-daemon
@ 2018-11-03 3:11 ` bugzilla-daemon
2018-11-05 22:44 ` bugzilla-daemon
2018-11-06 3:14 ` bugzilla-daemon
8 siblings, 0 replies; 10+ messages in thread
From: bugzilla-daemon @ 2018-11-03 3:11 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
--- Comment #7 from Zorro Lang (zlang@redhat.com) ---
(In reply to Zorro Lang from comment #6)
> After upstream merged the patch of this bug, I still can reproduce a
> shared/010 failure:
It's not duperemove related, I've removed all duperemove related part from
shared/010, still can reproduce this bug. On the other word, use fsstress and
md5sum can reproduce this bug.
But if set 'fsstress -f deduperange=0', can't reproduce this bug (at least I
can't reproduce it until now by loop running shared/010 200 times).
Hmm... maybe I should report a new bug, if this's a different bug with this
one.
Thanks,
Zorro
>
> FSTYP -- xfs (non-debug)
> PLATFORM -- Linux/x86_64 xxxxxxxx 4.19.0+
> MKFS_OPTIONS -- -f -m reflink=1 -b size=1024 /dev/mapper/xxxxxxxx-xfscratch
> MOUNT_OPTIONS -- -o context=system_u:object_r:root_t:s0
> /dev/mapper/xxxxxxxxx-xfscratch /mnt/scratch
>
> shared/010 160s ... - output mismatch (see
> /home/xfstests-dev/results//shared/010.out.bad)
> --- tests/shared/010.out 2018-10-16 23:31:53.924269141 -0400
> +++ /home/xfstests-dev/results//shared/010.out.bad 2018-11-02
> 12:20:39.858510419 -0400
> @@ -1,2 +1,4 @@
> QA output created by 010
> +/mnt/scratch/dir/p0/da/d51XX/f6dXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:
> FAILED
> +md5sum: WARNING: 1 computed checksum did NOT match
> Silence is golden
> ...
> (Run 'diff -u tests/shared/010.out
> /home/xfstests-dev/results//shared/010.out.bad' to see the entire diff)
> Ran: shared/010
> Failures: shared/010
> Failed 1 of 1 tests
>
> But maybe it's a new issue, due to I can't reproduce this bug by the
> reproducer on comment#1:
>
> # bash reproducer.sh
> umount: /mnt/scratch: not mounted.
> wrote 17179869184/17179869184 bytes at offset 0
> 16.000 GiB, 4194304 ops; 0:16:47.88 (16.256 MiB/sec and 4161.4915 ops/sec)
> meta-data=/dev/mapper/xxxxxxxx-xfscratch isize=512 agcount=16,
> agsize=8192000 blks
> = sectsz=512 attr=2, projid32bit=1
> = crc=1 finobt=1, sparse=1, rmapbt=0
> = reflink=1
> data = bsize=4096 blocks=131072000, imaxpct=25
> = sunit=64 swidth=64 blks
> naming =version 2 bsize=4096 ascii-ci=0, ftype=1
> log =internal log bsize=4096 blocks=64000, version=2
> = sectsz=512 sunit=0 blks, lazy-count=1
> realtime =none extsz=4096 blocks=0, rtextents=0
> wrote 1772544/1772544 bytes at offset 0
> 2 MiB, 433 ops; 0.0170 sec (99.111 MiB/sec and 25386.9606 ops/sec)
> wrote 840263/840263 bytes at offset 0
> 821 KiB, 206 ops; 0.0083 sec (96.419 MiB/sec and 24786.4276 ops/sec)
> linked 57344/57344 bytes at offset 212992
> 56 KiB, 1 ops; 0.0030 sec (17.698 MiB/sec and 323.6246 ops/sec)
> wrote 74240/74240 bytes at offset 1662464
> 72 KiB, 19 ops; 0.0010 sec (65.984 MiB/sec and 17707.3625 ops/sec)
> linked 122880/122880 bytes at offset 5357568
> 120 KiB, 1 ops; 0.0037 sec (31.477 MiB/sec and 268.6006 ops/sec)
> a42583dd3f7edb0c00e7356c89d3e58c /mnt/scratch/file
> a42583dd3f7edb0c00e7356c89d3e58c /mnt/scratch/file
> /mnt/scratch/file:
> EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL FLAGS
> 0: [0..415]: hole 416
> 1: [416..527]: 4880..4991 0 (4880..4991) 112 101111
> 2: [528..1215]: hole 688
> 3: [1216..2863]: 1024..2671 0 (1024..2671) 1648 010101
> 4: [2864..3239]: hole 376
> 5: [3240..3583]: 2672..3015 0 (2672..3015) 344 001111
> 6: [3584..10463]: hole 6880
> 7: [10464..10703]: 7800..8039 0 (7800..8039) 240 101111
> FLAG Values:
> 0100000 Shared extent
> 0010000 Unwritten preallocated extent
> 0001000 Doesn't begin on stripe unit
> 0000100 Doesn't end on stripe unit
> 0000010 Doesn't begin on stripe width
> 0000001 Doesn't end on stripe width
> 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> |................|
> *
> 00034000 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72 72
> |rrrrrrrrrrrrrrrr|
> *
> 00042000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> |................|
> *
> 00195e00 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57 57
> |WWWWWWWWWWWWWWWW|
> *
> 001a8000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> |................|
> *
> 0051c000 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52
> |RRRRRRRRRRRRRRRR|
> *
> 0053a000
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* [Bug 201259] [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
2018-09-28 6:06 [Bug 201259] New: [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount bugzilla-daemon
` (6 preceding siblings ...)
2018-11-03 3:11 ` bugzilla-daemon
@ 2018-11-05 22:44 ` bugzilla-daemon
2018-11-06 3:14 ` bugzilla-daemon
8 siblings, 0 replies; 10+ messages in thread
From: bugzilla-daemon @ 2018-11-05 22:44 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
--- Comment #8 from Eric Sandeen (sandeen@sandeen.net) ---
Zorro, I see that your new report is using a smaller blocksize (-b 1024) - was
that used in the initial report?
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* [Bug 201259] [xfstests shared/010]: maybe pagecache contents is mutated after cycle mount
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@ 2018-11-06 3:14 ` bugzilla-daemon
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From: bugzilla-daemon @ 2018-11-06 3:14 UTC (permalink / raw)
To: linux-xfs
https://bugzilla.kernel.org/show_bug.cgi?id=201259
--- Comment #9 from Zorro Lang (zlang@redhat.com) ---
(In reply to Eric Sandeen from comment #8)
> Zorro, I see that your new report is using a smaller blocksize (-b 1024) -
> was that used in the initial report?
No, smaller blocksize is not necessary (I just forgot remove that line after
another testing:). Both 1024 or 4096 blocksize can reproduce this bug.
Thanks,
Zorro
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2018-10-02 16:28 ` bugzilla-daemon
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2018-11-03 3:05 ` bugzilla-daemon
2018-11-03 3:11 ` bugzilla-daemon
2018-11-05 22:44 ` bugzilla-daemon
2018-11-06 3:14 ` bugzilla-daemon
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