* Corrupt leaf, trying to recover
@ 2022-08-13 2:51 Ash Logan
2022-08-13 4:45 ` Qu Wenruo
0 siblings, 1 reply; 8+ messages in thread
From: Ash Logan @ 2022-08-13 2:51 UTC (permalink / raw)
To: linux-btrfs
Hello!
I upgraded to Debian 11, and I think in the process it tried to install
GRUB over my btrfs partition? I'm not sure. In any case, I now can't get
it mounted:
[ 1692.811909] BTRFS critical (device md127): corrupt leaf: root=1
block=35291136 slot=115, invalid root flags, have 0x10000 expect mask
0x10000000
00001
[ 1692.825324] BTRFS error (device md127): block=35291136 read time tree
block corruption detected
[ 1692.837448] BTRFS critical (device md127): corrupt leaf: root=1
block=35291136 slot=115, invalid root flags, have 0x10000 expect mask
0x10000000
00001
[ 1692.850876] BTRFS error (device md127): block=35291136 read time tree
block corruption detected
[ 1692.859688] BTRFS warning (device md127): failed to read root
(objectid=2): -5
[ 1692.869075] BTRFS error (device md127): open_ctree failed
btrfs check and rescue=usebackuproot,ro give no dice, either saying
nothing is wrong or repeating the same errors. I can't scrub since it's
not mounted.
If it is just the "read time" that is corrupted, I would have no problem
losing that, but I'm hoping the files are salvageable?
# uname -a
Linux LogansNAS 5.10.0-16-amd64 #1 SMP Debian 5.10.127-1 (2022-06-30)
x86_64 GNU/Linux
Let me know if you have any advice.
Thanks,
Ash
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Corrupt leaf, trying to recover
2022-08-13 2:51 Corrupt leaf, trying to recover Ash Logan
@ 2022-08-13 4:45 ` Qu Wenruo
2022-08-13 7:56 ` Ash Logan
0 siblings, 1 reply; 8+ messages in thread
From: Qu Wenruo @ 2022-08-13 4:45 UTC (permalink / raw)
To: Ash Logan, linux-btrfs
On 2022/8/13 10:51, Ash Logan wrote:
> Hello!
>
> I upgraded to Debian 11, and I think in the process it tried to install
> GRUB over my btrfs partition? I'm not sure. In any case, I now can't get
> it mounted:
>
> [ 1692.811909] BTRFS critical (device md127): corrupt leaf: root=1
> block=35291136 slot=115, invalid root flags, have 0x10000 expect mask
> 0x10000000
> 00001
Please post the output of command "btrfs ins dump-tree -b 35291136 <device>"
It looks like a bitflip so far, and if that's the case, I strongly
recommend to do a memtest before continuing.
> [ 1692.825324] BTRFS error (device md127): block=35291136 read time tree
> block corruption detected
> [ 1692.837448] BTRFS critical (device md127): corrupt leaf: root=1
> block=35291136 slot=115, invalid root flags, have 0x10000 expect mask
> 0x10000000
> 00001
> [ 1692.850876] BTRFS error (device md127): block=35291136 read time tree
> block corruption detected
> [ 1692.859688] BTRFS warning (device md127): failed to read root
> (objectid=2): -5
> [ 1692.869075] BTRFS error (device md127): open_ctree failed
>
> btrfs check and rescue=usebackuproot,ro give no dice, either saying
> nothing is wrong or repeating the same errors. I can't scrub since it's
> not mounted.
>
> If it is just the "read time" that is corrupted, I would have no problem
> losing that, but I'm hoping the files are salvageable?
>
> # uname -a
> Linux LogansNAS 5.10.0-16-amd64 #1 SMP Debian 5.10.127-1 (2022-06-30)
> x86_64 GNU/Linux
Newer kernel (>= 5.11) has the ability to detect such bitflip before
writing such metadata onto disk.
Unfortunately since you're upgrading to Debian 11, I believe the damage
is there for a long time until you have upgraded to a newer kernel with
such sanity checks.
Thanks,
Qu
>
> Let me know if you have any advice.
>
> Thanks,
> Ash
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Corrupt leaf, trying to recover
2022-08-13 4:45 ` Qu Wenruo
@ 2022-08-13 7:56 ` Ash Logan
2022-08-13 8:05 ` Qu Wenruo
0 siblings, 1 reply; 8+ messages in thread
From: Ash Logan @ 2022-08-13 7:56 UTC (permalink / raw)
To: Qu Wenruo, linux-btrfs
[-- Attachment #1: Type: text/plain, Size: 637 bytes --]
Hi, thanks for your email!
> Please post the output of command "btrfs ins dump-tree -b 35291136
> <device>"
Attached.
> It looks like a bitflip so far, and if that's the case, I strongly
> recommend to do a memtest before continuing.
Will run now, hopefully it comes back clean.
> Unfortunately since you're upgrading to Debian 11, I believe the damage
> is there for a long time until you have upgraded to a newer kernel with
> such sanity checks.
Ouch. At least this suggests that a kernel downgrade could still allow
mounting and data recovery.
>
> Thanks,
> Qu
>>
>> Let me know if you have any advice.
>>
>> Thanks,
>> Ash
>>
[-- Attachment #2: tree-dump.txt --]
[-- Type: text/plain, Size: 53006 bytes --]
btrfs-progs v5.10.1
leaf 35291136 items 201 free space 5779 generation 377103 owner ROOT_TREE
leaf 35291136 flags 0x1(WRITTEN) backref revision 1
fs uuid 677085ac-57ba-4141-bcf1-dbc9267b306d
chunk uuid 3cada1fb-6d36-477c-89cc-055422804e99
item 0 key (EXTENT_TREE ROOT_ITEM 0) itemoff 32228 itemsize 439
generation 377103 root_dirid 0 bytenr 30638080 level 1 refs 1
lastsnap 0 byte_limit 0 bytes_used 16252928 flags 0x0(none)
uuid 00000000-0000-0000-0000-000000000000
drop key (0 UNKNOWN.0 0) level 0
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generation 376724 root_dirid 0 bytenr 662306816 level 0 refs 1
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uuid 00000000-0000-0000-0000-000000000000
drop key (0 UNKNOWN.0 0) level 0
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index 0 namelen 7 name: default
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generation 377101 root_dirid 256 bytenr 486146048 level 2 refs 1
lastsnap 0 byte_limit 0 bytes_used 88473600 flags 0x0(none)
uuid b36c62a1-ffc7-4862-9823-de9b8ebeef8e
ctransid 377101 otransid 0 stransid 0 rtransid 0
ctime 1658407346.425739678 (2022-07-21 22:42:26)
otime 1558764230.0 (2019-05-25 16:03:50)
drop key (0 UNKNOWN.0 0) level 0
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root ref key dirid 256 sequence 5 name home
item 5 key (FS_TREE ROOT_REF 264) itemoff 31287 itemsize 24
root ref key dirid 256 sequence 8 name Movies
item 6 key (FS_TREE ROOT_REF 389) itemoff 31264 itemsize 23
root ref key dirid 256 sequence 9 name Music
item 7 key (FS_TREE ROOT_REF 410) itemoff 31238 itemsize 26
root ref key dirid 256 sequence 10 name Pictures
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generation 3 transid 0 size 0 nbytes 32768
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atime 1558764230.0 (2019-05-25 16:03:50)
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index 0 namelen 2 name: ..
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location key (FS_TREE ROOT_ITEM 18446744073709551615) type DIR
transid 0 data_len 0 name_len 7
name: default
item 11 key (CSUM_TREE ROOT_ITEM 0) itemoff 30590 itemsize 439
generation 377102 root_dirid 0 bytenr 488570880 level 2 refs 1
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uuid 00000000-0000-0000-0000-000000000000
drop key (0 UNKNOWN.0 0) level 0
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generation 2022 root_dirid 256 bytenr 85393408 level 0 refs 1
lastsnap 0 byte_limit 0 bytes_used 32768 flags 0x0(none)
uuid 00000000-0000-0000-0000-000000000000
drop key (0 UNKNOWN.0 0) level 0
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generation 377102 transid 377102 size 262144 nbytes 98329427968
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drop key (0 UNKNOWN.0 0) level 0
item 16 key (260 ROOT_BACKREF 5) itemoff 29477 itemsize 22
root backref key dirid 256 sequence 5 name home
item 17 key (260 ROOT_REF 347) itemoff 29456 itemsize 21
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generation 224508 root_dirid 256 bytenr 572162048 level 1 refs 1
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drop key (0 UNKNOWN.0 0) level 0
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root backref key dirid 256 sequence 8 name Movies
item 20 key (264 ROOT_REF 265) itemoff 28965 itemsize 28
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generation 224440 root_dirid 256 bytenr 406224896 level 0 refs 1
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generation 376215 transid 376215 size 262144 nbytes 8090812416
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generation 377101 transid 377101 size 262144 nbytes 3532128256
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Corrupt leaf, trying to recover
2022-08-13 7:56 ` Ash Logan
@ 2022-08-13 8:05 ` Qu Wenruo
2022-08-13 8:28 ` Ash Logan
0 siblings, 1 reply; 8+ messages in thread
From: Qu Wenruo @ 2022-08-13 8:05 UTC (permalink / raw)
To: Ash Logan, linux-btrfs
On 2022/8/13 15:56, Ash Logan wrote:
> Hi, thanks for your email!
>
>> Please post the output of command "btrfs ins dump-tree -b 35291136
>> <device>"
>
> Attached.
It looks correct, all other ROOT_ITEMS has no extra flags, and only that
offending root has the problem.
Thus it looks more like a bitflip.
>
>> It looks like a bitflip so far, and if that's the case, I strongly
>> recommend to do a memtest before continuing.
>
> Will run now, hopefully it comes back clean.
>
>> Unfortunately since you're upgrading to Debian 11, I believe the damage
>> is there for a long time until you have upgraded to a newer kernel with
>> such sanity checks.
> Ouch. At least this suggests that a kernel downgrade could still allow
> mounting and data recovery.
Yes.
As long as that's the only bitflip, everything else should be fine.
If you want, you can remove subvolume 389 (and if that's the only
bitflip) using the older kernel and then mount using much newer kernel.
Personally speaking, it's strongly recommended to use kernel newer than
v5.11, even if a memtest is clean.
That new sanity check introduced in v5.11 should save a lot of hassle
like this.
Thanks,
Qu
>>
>> Thanks,
>> Qu
>>>
>>> Let me know if you have any advice.
>>>
>>> Thanks,
>>> Ash
>>>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Corrupt leaf, trying to recover
2022-08-13 8:05 ` Qu Wenruo
@ 2022-08-13 8:28 ` Ash Logan
2022-08-13 8:37 ` Qu Wenruo
2022-08-13 17:36 ` Roman Mamedov
0 siblings, 2 replies; 8+ messages in thread
From: Ash Logan @ 2022-08-13 8:28 UTC (permalink / raw)
To: Qu Wenruo, linux-btrfs
> It looks correct, all other ROOT_ITEMS has no extra flags, and only that
> offending root has the problem.
>
> Thus it looks more like a bitflip.
Cosmic rays got me, perhaps. Thank you for your help in diagnosis!
> Yes.
>
> As long as that's the only bitflip, everything else should be fine.
>
> If you want, you can remove subvolume 389 (and if that's the only
> bitflip) using the older kernel and then mount using much newer kernel.
Would I be safe to copy the files to another volume before doing that?
> Personally speaking, it's strongly recommended to use kernel newer than
> v5.11, even if a memtest is clean.
>
> That new sanity check introduced in v5.11 should save a lot of hassle
> like this.
Debian doesn't ship it, though.. Will have to see what my options are
there. Maybe time to build my own.
Thanks,
Ash
>
> Thanks,
> Qu
>
>>>
>>> Thanks,
>>> Qu
>>>>
>>>> Let me know if you have any advice.
>>>>
>>>> Thanks,
>>>> Ash
>>>>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Corrupt leaf, trying to recover
2022-08-13 8:28 ` Ash Logan
@ 2022-08-13 8:37 ` Qu Wenruo
2022-08-13 17:36 ` Roman Mamedov
1 sibling, 0 replies; 8+ messages in thread
From: Qu Wenruo @ 2022-08-13 8:37 UTC (permalink / raw)
To: Ash Logan, linux-btrfs
On 2022/8/13 16:28, Ash Logan wrote:
>> It looks correct, all other ROOT_ITEMS has no extra flags, and only that
>> offending root has the problem.
>>
>> Thus it looks more like a bitflip.
>
> Cosmic rays got me, perhaps. Thank you for your help in diagnosis!
>
>> Yes.
>>
>> As long as that's the only bitflip, everything else should be fine.
>>
>> If you want, you can remove subvolume 389 (and if that's the only
>> bitflip) using the older kernel and then mount using much newer kernel.
> Would I be safe to copy the files to another volume before doing that?
Yes, that should be safe.
The offending corruption really only affect that ROOT_ITEM, which is not
related to any file/directory under that subvolume.
You can safely reflink all the content to another volume and call it a day.
Thanks,
Qu
>> Personally speaking, it's strongly recommended to use kernel newer than
>> v5.11, even if a memtest is clean.
>>
>> That new sanity check introduced in v5.11 should save a lot of hassle
>> like this.
>
> Debian doesn't ship it, though.. Will have to see what my options are
> there. Maybe time to build my own. >
> Thanks,
> Ash
>
>>
>> Thanks,
>> Qu
>>
>>>>
>>>> Thanks,
>>>> Qu
>>>>>
>>>>> Let me know if you have any advice.
>>>>>
>>>>> Thanks,
>>>>> Ash
>>>>>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Corrupt leaf, trying to recover
2022-08-13 8:28 ` Ash Logan
2022-08-13 8:37 ` Qu Wenruo
@ 2022-08-13 17:36 ` Roman Mamedov
2022-08-14 0:11 ` Ash Logan
1 sibling, 1 reply; 8+ messages in thread
From: Roman Mamedov @ 2022-08-13 17:36 UTC (permalink / raw)
To: Ash Logan; +Cc: Qu Wenruo, linux-btrfs
On Sat, 13 Aug 2022 18:28:36 +1000
Ash Logan <ash@heyquark.com> wrote:
> > That new sanity check introduced in v5.11 should save a lot of hassle
> > like this.
>
> Debian doesn't ship it, though.. Will have to see what my options are
> there. Maybe time to build my own.
Kernel 5.18 is available in the backports repository for Debian 11:
https://packages.debian.org/search?keywords=linux-image-5.18
See https://backports.debian.org/Instructions/
As for bitflip, I would be concerned to keep using this hardware (RAM). It
might be that you are using tests that are not rigorous enough. For instance
once I got some sticks which were "stable" in MemTest86+, but TestMem5 with
its custom 'extreme' profiles has reported errors.
Or at least next time you get a weird Btrfs issue, which is quite good, with
its currently present write-time/read-time sanity checks, at tripping on any
bad RAM in a loud way, you will know there is definitely something wrong with
it.
--
With respect,
Roman
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Corrupt leaf, trying to recover
2022-08-13 17:36 ` Roman Mamedov
@ 2022-08-14 0:11 ` Ash Logan
0 siblings, 0 replies; 8+ messages in thread
From: Ash Logan @ 2022-08-14 0:11 UTC (permalink / raw)
To: Roman Mamedov; +Cc: Qu Wenruo, linux-btrfs
On 14/8/22 03:36, Roman Mamedov wrote:
> On Sat, 13 Aug 2022 18:28:36 +1000
> Ash Logan <ash@heyquark.com> wrote:
>
>>> That new sanity check introduced in v5.11 should save a lot of hassle
>>> like this.
>> Debian doesn't ship it, though.. Will have to see what my options are
>> there. Maybe time to build my own.
> Kernel 5.18 is available in the backports repository for Debian 11:
> https://packages.debian.org/search?keywords=linux-image-5.18
>
> See https://backports.debian.org/Instructions/
Perfect, thanks.
> As for bitflip, I would be concerned to keep using this hardware (RAM). It
> might be that you are using tests that are not rigorous enough. For instance
> once I got some sticks which were "stable" in MemTest86+, but TestMem5 with
> its custom 'extreme' profiles has reported errors.
>
> Or at least next time you get a weird Btrfs issue, which is quite good, with
> its currently present write-time/read-time sanity checks, at tripping on any
> bad RAM in a loud way, you will know there is definitely something wrong with
> it.
I did end up finding another (larger!) RAM stick which also tested
clean, so I now have that in there.
I actually had another subvolume (ID 410) with the exact same incorrect
flag bit set. Given the filesystem otherwise seems totally clean, I no
longer suspect a memory bitflip - it seems more likely that across
various software versions (ReadyNAS OS, Debian versions, etc...) someone
had a customisation or a bug that went unnoticed due to the lack of checks.
<speculation> I noticed the two problematic subvolumes also are the only
ones that had snapshots.. perhaps ReadyNAS or the like used such a flag
to track if snapshots are enabled? </speculation>
Thanks,
Ash
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2022-08-14 0:11 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-08-13 2:51 Corrupt leaf, trying to recover Ash Logan
2022-08-13 4:45 ` Qu Wenruo
2022-08-13 7:56 ` Ash Logan
2022-08-13 8:05 ` Qu Wenruo
2022-08-13 8:28 ` Ash Logan
2022-08-13 8:37 ` Qu Wenruo
2022-08-13 17:36 ` Roman Mamedov
2022-08-14 0:11 ` Ash Logan
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