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* runtime btrfsck
@ 2017-05-02  6:29 Stefan Priebe - Profihost AG
  2017-05-06  5:56 ` Stefan Priebe - Profihost AG
  0 siblings, 1 reply; 16+ messages in thread
From: Stefan Priebe - Profihost AG @ 2017-05-02  6:29 UTC (permalink / raw)
  To: linux-btrfs@vger.kernel.org

Hello list,

i wanted to check an fs cause it has bad key ordering.

But btrfscheck is now running since 7 days. Current output:
# btrfsck -p --repair /dev/mapper/crypt_md0
enabling repair mode
Checking filesystem on /dev/mapper/crypt_md0
UUID: 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
bad key ordering 39 40
checking extents [O]

FS is a 12TB BTRFS Raid 0 over 3 mdadm Raid 5 devices. How long should
btrfsck run and is there any way to speed it up? btrfs tools is 4.8.5

Thanks!

Greets,
Stefan

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-02  6:29 runtime btrfsck Stefan Priebe - Profihost AG
@ 2017-05-06  5:56 ` Stefan Priebe - Profihost AG
  2017-05-10  7:02   ` Stefan Priebe - Profihost AG
  0 siblings, 1 reply; 16+ messages in thread
From: Stefan Priebe - Profihost AG @ 2017-05-06  5:56 UTC (permalink / raw)
  To: linux-btrfs@vger.kernel.org

It's still running. Is this the normal behaviour? Is there any other way
to fix the bad key ordering?

Greets,
Stefan

Am 02.05.2017 um 08:29 schrieb Stefan Priebe - Profihost AG:
> Hello list,
> 
> i wanted to check an fs cause it has bad key ordering.
> 
> But btrfscheck is now running since 7 days. Current output:
> # btrfsck -p --repair /dev/mapper/crypt_md0
> enabling repair mode
> Checking filesystem on /dev/mapper/crypt_md0
> UUID: 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
> bad key ordering 39 40
> checking extents [O]
> 
> FS is a 12TB BTRFS Raid 0 over 3 mdadm Raid 5 devices. How long should
> btrfsck run and is there any way to speed it up? btrfs tools is 4.8.5
> 
> Thanks!
> 
> Greets,
> Stefan
> 

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-06  5:56 ` Stefan Priebe - Profihost AG
@ 2017-05-10  7:02   ` Stefan Priebe - Profihost AG
  2017-05-10  7:18     ` Roman Mamedov
                       ` (2 more replies)
  0 siblings, 3 replies; 16+ messages in thread
From: Stefan Priebe - Profihost AG @ 2017-05-10  7:02 UTC (permalink / raw)
  To: linux-btrfs@vger.kernel.org

I'm now trying btrfs progs 4.10.2. Is anybody out there who can tell me
something about the expected runtime or how to fix bad key ordering?

Greets,
Stefan

Am 06.05.2017 um 07:56 schrieb Stefan Priebe - Profihost AG:
> It's still running. Is this the normal behaviour? Is there any other way
> to fix the bad key ordering?
> 
> Greets,
> Stefan
> 
> Am 02.05.2017 um 08:29 schrieb Stefan Priebe - Profihost AG:
>> Hello list,
>>
>> i wanted to check an fs cause it has bad key ordering.
>>
>> But btrfscheck is now running since 7 days. Current output:
>> # btrfsck -p --repair /dev/mapper/crypt_md0
>> enabling repair mode
>> Checking filesystem on /dev/mapper/crypt_md0
>> UUID: 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
>> bad key ordering 39 40
>> checking extents [O]
>>
>> FS is a 12TB BTRFS Raid 0 over 3 mdadm Raid 5 devices. How long should
>> btrfsck run and is there any way to speed it up? btrfs tools is 4.8.5
>>
>> Thanks!
>>
>> Greets,
>> Stefan
>>

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  7:02   ` Stefan Priebe - Profihost AG
@ 2017-05-10  7:18     ` Roman Mamedov
  2017-05-10  7:36       ` Stefan Priebe - Profihost AG
  2017-05-10  7:24     ` Marat Khalili
  2017-05-10  7:48     ` Martin Steigerwald
  2 siblings, 1 reply; 16+ messages in thread
From: Roman Mamedov @ 2017-05-10  7:18 UTC (permalink / raw)
  To: Stefan Priebe - Profihost AG; +Cc: linux-btrfs@vger.kernel.org

On Wed, 10 May 2017 09:02:46 +0200
Stefan Priebe - Profihost AG <s.priebe@profihost.ag> wrote:

> how to fix bad key ordering?

You should clarify does the FS in question mount (read-write? read-only?)
and what are the kernel messages if it does not.

-- 
With respect,
Roman

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  7:02   ` Stefan Priebe - Profihost AG
  2017-05-10  7:18     ` Roman Mamedov
@ 2017-05-10  7:24     ` Marat Khalili
  2017-05-10  7:48     ` Martin Steigerwald
  2 siblings, 0 replies; 16+ messages in thread
From: Marat Khalili @ 2017-05-10  7:24 UTC (permalink / raw)
  To: linux-btrfs@vger.kernel.org

Hello,

(Warning: I'm a user, not a developer here.)

In my experience (on kernel 4.4) it processed larger and slower devices 
within a day, BUT according to some recent topics the runaway 
fragmentation (meaning in this case large number of small extents 
regardless of their relative location) can significantly slow down BTRFS 
operations to the point of making them infeasible. Possible reasons for 
fragmentations are snapshotting volumes too often and/or running VM 
images from BTRFS without taking some precautions.

On top of this, mount device name makes one suspicious there's another 
layer between BTRFS and hardware. Are you sure it's not the bottleneck 
in this case?

--

With Best Regards,
Marat Khalili

On 10/05/17 10:02, Stefan Priebe - Profihost AG wrote:
> I'm now trying btrfs progs 4.10.2. Is anybody out there who can tell me
> something about the expected runtime or how to fix bad key ordering?
>
> Greets,
> Stefan
>
> Am 06.05.2017 um 07:56 schrieb Stefan Priebe - Profihost AG:
>> It's still running. Is this the normal behaviour? Is there any other way
>> to fix the bad key ordering?
>>
>> Greets,
>> Stefan
>>
>> Am 02.05.2017 um 08:29 schrieb Stefan Priebe - Profihost AG:
>>> Hello list,
>>>
>>> i wanted to check an fs cause it has bad key ordering.
>>>
>>> But btrfscheck is now running since 7 days. Current output:
>>> # btrfsck -p --repair /dev/mapper/crypt_md0
>>> enabling repair mode
>>> Checking filesystem on /dev/mapper/crypt_md0
>>> UUID: 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
>>> bad key ordering 39 40
>>> checking extents [O]
>>>
>>> FS is a 12TB BTRFS Raid 0 over 3 mdadm Raid 5 devices. How long should
>>> btrfsck run and is there any way to speed it up? btrfs tools is 4.8.5
>>>
>>> Thanks!
>>>
>>> Greets,
>>> Stefan
>>>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" 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] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  7:18     ` Roman Mamedov
@ 2017-05-10  7:36       ` Stefan Priebe - Profihost AG
  2017-05-10  7:40         ` Hugo Mills
  0 siblings, 1 reply; 16+ messages in thread
From: Stefan Priebe - Profihost AG @ 2017-05-10  7:36 UTC (permalink / raw)
  To: Roman Mamedov; +Cc: linux-btrfs@vger.kernel.org

Hello Roman,

the FS is mountable. It just goes readonly when trying to write some data.

The kernel msgs are:
BTRFS critical (device dm-2): corrupt leaf, bad key order:
block=163316514816,root=1, slot=39
BTRFS critical (device dm-2): corrupt leaf, bad key order:
block=163322413056,root=1, slot=74
BTRFS critical (device dm-2): corrupt leaf, bad key order:
block=163325722624,root=1, slot=63
BTRFS critical (device dm-2): corrupt leaf, bad key order:
block=163316514816,root=1, slot=39
BTRFS: error (device dm-2) in btrfs_drop_snapshot:8839: errno=-5 IO failure
BTRFS info (device dm-2): forced readonly
BTRFS info (device dm-2): delayed_refs has NO entry

Greets,
Stefan
Am 10.05.2017 um 09:18 schrieb Roman Mamedov:
> On Wed, 10 May 2017 09:02:46 +0200
> Stefan Priebe - Profihost AG <s.priebe@profihost.ag> wrote:
> 
>> how to fix bad key ordering?
> 
> You should clarify does the FS in question mount (read-write? read-only?)
> and what are the kernel messages if it does not.
> 

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  7:36       ` Stefan Priebe - Profihost AG
@ 2017-05-10  7:40         ` Hugo Mills
  2017-05-10  8:40           ` Stefan Priebe - Profihost AG
  0 siblings, 1 reply; 16+ messages in thread
From: Hugo Mills @ 2017-05-10  7:40 UTC (permalink / raw)
  To: Stefan Priebe - Profihost AG; +Cc: Roman Mamedov, linux-btrfs@vger.kernel.org

[-- Attachment #1: Type: text/plain, Size: 1475 bytes --]

On Wed, May 10, 2017 at 09:36:30AM +0200, Stefan Priebe - Profihost AG wrote:
> Hello Roman,
> 
> the FS is mountable. It just goes readonly when trying to write some data.
> 
> The kernel msgs are:
> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> block=163316514816,root=1, slot=39
> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> block=163322413056,root=1, slot=74
> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> block=163325722624,root=1, slot=63
> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> block=163316514816,root=1, slot=39
> BTRFS: error (device dm-2) in btrfs_drop_snapshot:8839: errno=-5 IO failure
> BTRFS info (device dm-2): forced readonly
> BTRFS info (device dm-2): delayed_refs has NO entry

   Can you show the output of btrfs-debug-tree -b <blocknum>, where
<blocknum> is each of the three "block=" values above?

   Hugo.

> Greets,
> Stefan
> Am 10.05.2017 um 09:18 schrieb Roman Mamedov:
> > On Wed, 10 May 2017 09:02:46 +0200
> > Stefan Priebe - Profihost AG <s.priebe@profihost.ag> wrote:
> > 
> >> how to fix bad key ordering?
> > 
> > You should clarify does the FS in question mount (read-write? read-only?)
> > and what are the kernel messages if it does not.
> > 

-- 
Hugo Mills             | Welcome to Hollywood, a land just off the coast of
hugo@... carfax.org.uk | Planet Earth
http://carfax.org.uk/  |
PGP: E2AB1DE4          |                                        The Cat's Meow

[-- Attachment #2: Digital signature --]
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^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  7:02   ` Stefan Priebe - Profihost AG
  2017-05-10  7:18     ` Roman Mamedov
  2017-05-10  7:24     ` Marat Khalili
@ 2017-05-10  7:48     ` Martin Steigerwald
  2017-05-10  8:42       ` Stefan Priebe - Profihost AG
  2017-05-10  8:52       ` Roman Mamedov
  2 siblings, 2 replies; 16+ messages in thread
From: Martin Steigerwald @ 2017-05-10  7:48 UTC (permalink / raw)
  To: Stefan Priebe - Profihost AG; +Cc: linux-btrfs@vger.kernel.org

Stefan Priebe - Profihost AG - 10.05.17, 09:02:
> I'm now trying btrfs progs 4.10.2. Is anybody out there who can tell me
> something about the expected runtime or how to fix bad key ordering?

I had a similar issue which remained unresolved.

But I clearly saw that btrfs check was running in a loop, see thread:

[4.9] btrfs check --repair looping over file extent discount errors

So it would be interesting to see the exact output of btrfs check, maybe there 
is something like repeated numbers that also indicate a loop.

I was about to say that BTRFS is production ready before this issue happened. 
I still think it for a lot of setup mostly is, as at least the "I get stuck on 
the CPU while searching for free space" issue seems to be gone since about 
anything between 4.5/4.6 kernels. I also think so regarding absence of data 
loss. I was able to copy over all of the data I needed of the broken 
filesystem.

Yet, when it comes to btrfs check? Its still quite rudimentary if you ask me.  
So unless someone has a clever idea here and shares it with you, it may be 
needed to backup anything you can from this filesystem and then start over from 
scratch. As to my past experience something like xfs_repair surpasses btrfs 
check in the ability to actually fix broken filesystem by a great extent.

Ciao,
-- 
Martin

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  7:40         ` Hugo Mills
@ 2017-05-10  8:40           ` Stefan Priebe - Profihost AG
  2017-05-10  9:08             ` Hugo Mills
  0 siblings, 1 reply; 16+ messages in thread
From: Stefan Priebe - Profihost AG @ 2017-05-10  8:40 UTC (permalink / raw)
  To: Hugo Mills, Roman Mamedov, linux-btrfs@vger.kernel.org

Am 10.05.2017 um 09:40 schrieb Hugo Mills:
> On Wed, May 10, 2017 at 09:36:30AM +0200, Stefan Priebe - Profihost AG wrote:
>> Hello Roman,
>>
>> the FS is mountable. It just goes readonly when trying to write some data.
>>
>> The kernel msgs are:
>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>> block=163316514816,root=1, slot=39
>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>> block=163322413056,root=1, slot=74
>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>> block=163325722624,root=1, slot=63
>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>> block=163316514816,root=1, slot=39
>> BTRFS: error (device dm-2) in btrfs_drop_snapshot:8839: errno=-5 IO failure
>> BTRFS info (device dm-2): forced readonly
>> BTRFS info (device dm-2): delayed_refs has NO entry
> 
>    Can you show the output of btrfs-debug-tree -b <blocknum>, where
> <blocknum> is each of the three "block=" values above?

Can do that. But the lists are very long - should i upload them to
pastebin? Is it ok to remove the name atribute - which provides filenames?

Stefan


>    Hugo.
> 
>> Greets,
>> Stefan
>> Am 10.05.2017 um 09:18 schrieb Roman Mamedov:
>>> On Wed, 10 May 2017 09:02:46 +0200
>>> Stefan Priebe - Profihost AG <s.priebe@profihost.ag> wrote:
>>>
>>>> how to fix bad key ordering?
>>>
>>> You should clarify does the FS in question mount (read-write? read-only?)
>>> and what are the kernel messages if it does not.
>>>
> 

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  7:48     ` Martin Steigerwald
@ 2017-05-10  8:42       ` Stefan Priebe - Profihost AG
  2017-05-10  8:52       ` Roman Mamedov
  1 sibling, 0 replies; 16+ messages in thread
From: Stefan Priebe - Profihost AG @ 2017-05-10  8:42 UTC (permalink / raw)
  To: Martin Steigerwald; +Cc: linux-btrfs@vger.kernel.org

Hi,
Am 10.05.2017 um 09:48 schrieb Martin Steigerwald:
> Stefan Priebe - Profihost AG - 10.05.17, 09:02:
>> I'm now trying btrfs progs 4.10.2. Is anybody out there who can tell me
>> something about the expected runtime or how to fix bad key ordering?
> 
> I had a similar issue which remained unresolved.
> But I clearly saw that btrfs check was running in a loop, see thread:
> [4.9] btrfs check --repair looping over file extent discount errors
> 
> So it would be interesting to see the exact output of btrfs check, maybe there 
> is something like repeated numbers that also indicate a loop.

Output is just:
enabling repair mode
Checking filesystem on /dev/mapper/crypt_md0
UUID: 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
bad key ordering 39 40
checking extents [.]

even after 2,5 weeks running.

Stefan

> I was about to say that BTRFS is production ready before this issue happened. 
> I still think it for a lot of setup mostly is, as at least the "I get stuck on 
> the CPU while searching for free space" issue seems to be gone since about 
> anything between 4.5/4.6 kernels. I also think so regarding absence of data 
> loss. I was able to copy over all of the data I needed of the broken 
> filesystem.
> 
> Yet, when it comes to btrfs check? Its still quite rudimentary if you ask me.  
> So unless someone has a clever idea here and shares it with you, it may be 
> needed to backup anything you can from this filesystem and then start over from 
> scratch. As to my past experience something like xfs_repair surpasses btrfs 
> check in the ability to actually fix broken filesystem by a great extent.
> 
> Ciao,
> 

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  7:48     ` Martin Steigerwald
  2017-05-10  8:42       ` Stefan Priebe - Profihost AG
@ 2017-05-10  8:52       ` Roman Mamedov
  2017-05-11 14:03         ` Duncan
  1 sibling, 1 reply; 16+ messages in thread
From: Roman Mamedov @ 2017-05-10  8:52 UTC (permalink / raw)
  To: Martin Steigerwald
  Cc: Stefan Priebe - Profihost AG, linux-btrfs@vger.kernel.org

On Wed, 10 May 2017 09:48:07 +0200
Martin Steigerwald <martin@lichtvoll.de> wrote:

> Yet, when it comes to btrfs check? Its still quite rudimentary if you ask me.  

Indeed it is. It may or may not be possible to build a perfect Fsck, but IMO
for the time being, what's most sorely missing, is some sort of a knowingly
destructive repair mode, as in "I don't care about partial user data loss,
just whack the FS metadata into full logical consistency at any means
necessary".

Also feels like it doesn't currently deal with the majority of actual
in-real-world corruptions, notably the "parent transid failure" (even by a few
dozens increments) which it can only helpfully "Ignore" during repair.

So even with a minor corruption (something wonky in just ONE block of a
multi-terabyte FS) the answer is way too often "nuke the entire thing and
restore from backups".

-- 
With respect,
Roman

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  8:40           ` Stefan Priebe - Profihost AG
@ 2017-05-10  9:08             ` Hugo Mills
  2017-05-10  9:20               ` Stefan Priebe - Profihost AG
  0 siblings, 1 reply; 16+ messages in thread
From: Hugo Mills @ 2017-05-10  9:08 UTC (permalink / raw)
  To: Stefan Priebe - Profihost AG; +Cc: Roman Mamedov, linux-btrfs@vger.kernel.org

[-- Attachment #1: Type: text/plain, Size: 2116 bytes --]

On Wed, May 10, 2017 at 10:40:31AM +0200, Stefan Priebe - Profihost AG wrote:
> Am 10.05.2017 um 09:40 schrieb Hugo Mills:
> > On Wed, May 10, 2017 at 09:36:30AM +0200, Stefan Priebe - Profihost AG wrote:
> >> Hello Roman,
> >>
> >> the FS is mountable. It just goes readonly when trying to write some data.
> >>
> >> The kernel msgs are:
> >> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> >> block=163316514816,root=1, slot=39
> >> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> >> block=163322413056,root=1, slot=74
> >> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> >> block=163325722624,root=1, slot=63
> >> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> >> block=163316514816,root=1, slot=39
> >> BTRFS: error (device dm-2) in btrfs_drop_snapshot:8839: errno=-5 IO failure
> >> BTRFS info (device dm-2): forced readonly
> >> BTRFS info (device dm-2): delayed_refs has NO entry
> > 
> >    Can you show the output of btrfs-debug-tree -b <blocknum>, where
> > <blocknum> is each of the three "block=" values above?
> 
> Can do that. But the lists are very long - should i upload them to
> pastebin? Is it ok to remove the name atribute - which provides filenames?

   On the mailing list would be preferable, as then the conversation
is completely preserved in archives. They shouldn't be so long that
vger rejects them. And yes, if you want to filter out the filenames,
do so (but _just_ the filename -- don't remove the whole line).

   Hugo.

> Stefan
> 
> 
> >    Hugo.
> > 
> >> Greets,
> >> Stefan
> >> Am 10.05.2017 um 09:18 schrieb Roman Mamedov:
> >>> On Wed, 10 May 2017 09:02:46 +0200
> >>> Stefan Priebe - Profihost AG <s.priebe@profihost.ag> wrote:
> >>>
> >>>> how to fix bad key ordering?
> >>>
> >>> You should clarify does the FS in question mount (read-write? read-only?)
> >>> and what are the kernel messages if it does not.
> >>>
> > 

-- 
Hugo Mills             | Alert status mauve ocelot: Slight chance of
hugo@... carfax.org.uk | brimstone. Be prepared to make a nice cup of tea.
http://carfax.org.uk/  |
PGP: E2AB1DE4          |

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^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  9:08             ` Hugo Mills
@ 2017-05-10  9:20               ` Stefan Priebe - Profihost AG
  2017-05-10  9:54                 ` Hugo Mills
  0 siblings, 1 reply; 16+ messages in thread
From: Stefan Priebe - Profihost AG @ 2017-05-10  9:20 UTC (permalink / raw)
  To: Hugo Mills, Roman Mamedov, linux-btrfs@vger.kernel.org

Hello,

here's the output:
# for block in 163316514816 163322413056 163325722624; do echo $block;
btrfs-debug-tree -b $block /dev/mapper/crypt_md0|sed -re 's/(\t| )name:
.*/\1name: HIDDEN/'; done

163316514816
btrfs-progs v4.8.5
leaf 163316514816 items 188 free space 1387 generation 86739 owner 3892
fs uuid 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
chunk uuid b86efe94-ab40-4344-ac6b-46ec59c41b8f
        item 0 key (23760 DIR_ITEM 2479948887) itemoff 16229 itemsize 54
                location key (26923382 INODE_ITEM 0) type FILE
                transid 74009 data_len 0 name_len 24
                name: HIDDEN
        item 1 key (23760 DIR_ITEM 2652742785) itemoff 16170 itemsize 59
                location key (28124230 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 29
                name: HIDDEN
        item 2 key (23760 DIR_ITEM 2688971413) itemoff 16119 itemsize 51
                location key (26923386 INODE_ITEM 0) type FILE
                transid 74009 data_len 0 name_len 21
                name: HIDDEN
        item 3 key (23760 DIR_ITEM 2764880658) itemoff 16064 itemsize 55
                location key (26923399 INODE_ITEM 0) type FILE
                transid 74009 data_len 0 name_len 25
                name: HIDDEN
        item 4 key (23760 DIR_ITEM 2805527189) itemoff 16006 itemsize 58
                location key (28124233 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 28
                name: HIDDEN
        item 5 key (23760 DIR_ITEM 2876464375) itemoff 15957 itemsize 49
                location key (26923393 INODE_ITEM 0) type FILE
                transid 74009 data_len 0 name_len 19
                name: HIDDEN
        item 6 key (23760 DIR_ITEM 2951059296) itemoff 15907 itemsize 50
                location key (28124218 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 20
                name: HIDDEN
        item 7 key (23760 DIR_ITEM 3058144963) itemoff 15859 itemsize 48
                location key (26923384 INODE_ITEM 0) type FILE
                transid 74009 data_len 0 name_len 18
                name: HIDDEN
        item 8 key (23760 DIR_ITEM 3095440808) itemoff 15804 itemsize 55
                location key (26923394 INODE_ITEM 0) type FILE
                transid 74009 data_len 0 name_len 25
                name: HIDDEN
        item 9 key (23760 DIR_ITEM 3124573416) itemoff 15748 itemsize 56
                location key (26923387 INODE_ITEM 0) type FILE
                transid 74009 data_len 0 name_len 26
                name: HIDDEN
        item 10 key (23760 DIR_ITEM 3194204932) itemoff 15690 itemsize 58
                location key (26923397 INODE_ITEM 0) type FILE
                transid 74009 data_len 0 name_len 28
                name: HIDDEN
        item 11 key (23760 DIR_ITEM 3281114395) itemoff 15637 itemsize 53
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        item 50 key (24189 DIR_INDEX 4) itemoff 10132 itemsize 53
                location key (28124255 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 23
                name: HIDDEN
        item 51 key (24189 DIR_INDEX 5) itemoff 10072 itemsize 60
                location key (28124256 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 30
                name: HIDDEN
        item 52 key (24189 DIR_INDEX 6) itemoff 10015 itemsize 57
                location key (28124257 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 27
                name: HIDDEN
        item 53 key (24189 DIR_INDEX 7) itemoff 9956 itemsize 59
                location key (28124258 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 29
                name: HIDDEN
        item 54 key (24189 DIR_INDEX 8) itemoff 9897 itemsize 59
                location key (28124259 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 29
                name: HIDDEN
        item 55 key (24189 DIR_INDEX 9) itemoff 9838 itemsize 59
                location key (28124260 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 29
                name: HIDDEN
        item 56 key (24189 DIR_INDEX 10) itemoff 9776 itemsize 62
                location key (28124261 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 32
                name: HIDDEN
        item 57 key (24189 DIR_INDEX 11) itemoff 9721 itemsize 55
                location key (28124262 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 25
                name: HIDDEN
        item 58 key (24189 DIR_INDEX 12) itemoff 9657 itemsize 64
                location key (28124263 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 34
                name: HIDDEN
        item 59 key (24189 DIR_INDEX 13) itemoff 9597 itemsize 60
                location key (28124264 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 30
                name: HIDDEN
        item 60 key (24189 DIR_INDEX 14) itemoff 9538 itemsize 59
                location key (28124265 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 29
                name: HIDDEN
        item 61 key (24189 DIR_INDEX 15) itemoff 9473 itemsize 65
                location key (28124266 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 35
                name: HIDDEN
        item 62 key (24189 DIR_INDEX 16) itemoff 9409 itemsize 64
                location key (28124267 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 34
                name: HIDDEN
        item 63 key (24189 DIR_INDEX 17) itemoff 9349 itemsize 60
                location key (28124268 INODE_ITEM 0) type FILE
                transid 86739 data_len 0 name_len 30
                name: HIDDEN
        item 64 key (24189 DIR_INDEX 4) itemoff 9296 itemsize 53
                location key (26923421 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 23
                name: HIDDEN
        item 65 key (24189 DIR_INDEX 5) itemoff 9236 itemsize 60
                location key (26923422 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 30
                name: HIDDEN
        item 66 key (24189 DIR_INDEX 6) itemoff 9179 itemsize 57
                location key (26923423 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 27
                name: HIDDEN
        item 67 key (24189 DIR_INDEX 7) itemoff 9120 itemsize 59
                location key (26923424 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 29
                name: HIDDEN
        item 68 key (24189 DIR_INDEX 8) itemoff 9061 itemsize 59
                location key (26923425 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 29
                name: HIDDEN
        item 69 key (24189 DIR_INDEX 9) itemoff 9002 itemsize 59
                location key (26923426 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 29
                name: HIDDEN
        item 70 key (24189 DIR_INDEX 10) itemoff 8940 itemsize 62
                location key (26923427 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 32
                name: HIDDEN
        item 71 key (24189 DIR_INDEX 11) itemoff 8885 itemsize 55
                location key (26923428 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 25
                name: HIDDEN
        item 72 key (24189 DIR_INDEX 12) itemoff 8821 itemsize 64
                location key (26923429 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 34
                name: HIDDEN
        item 73 key (24189 DIR_INDEX 13) itemoff 8761 itemsize 60
                location key (26923430 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 30
                name: HIDDEN
        item 74 key (24189 DIR_INDEX 14) itemoff 8702 itemsize 59
                location key (26923431 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 29
                name: HIDDEN
        item 75 key (24189 DIR_INDEX 15) itemoff 8637 itemsize 65
                location key (26923432 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 35
                name: HIDDEN
        item 76 key (24189 DIR_INDEX 16) itemoff 8573 itemsize 64
                location key (26923433 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 34
                name: HIDDEN
        item 77 key (24189 DIR_INDEX 17) itemoff 8513 itemsize 60
                location key (26923434 INODE_ITEM 0) type FILE
                transid 74010 data_len 0 name_len 30
                name: HIDDEN

Stefan
Am 10.05.2017 um 11:08 schrieb Hugo Mills:
> On Wed, May 10, 2017 at 10:40:31AM +0200, Stefan Priebe - Profihost AG wrote:
>> Am 10.05.2017 um 09:40 schrieb Hugo Mills:
>>> On Wed, May 10, 2017 at 09:36:30AM +0200, Stefan Priebe - Profihost AG wrote:
>>>> Hello Roman,
>>>>
>>>> the FS is mountable. It just goes readonly when trying to write some data.
>>>>
>>>> The kernel msgs are:
>>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>>>> block=163316514816,root=1, slot=39
>>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>>>> block=163322413056,root=1, slot=74
>>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>>>> block=163325722624,root=1, slot=63
>>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>>>> block=163316514816,root=1, slot=39
>>>> BTRFS: error (device dm-2) in btrfs_drop_snapshot:8839: errno=-5 IO failure
>>>> BTRFS info (device dm-2): forced readonly
>>>> BTRFS info (device dm-2): delayed_refs has NO entry
>>>
>>>    Can you show the output of btrfs-debug-tree -b <blocknum>, where
>>> <blocknum> is each of the three "block=" values above?
>>
>> Can do that. But the lists are very long - should i upload them to
>> pastebin? Is it ok to remove the name atribute - which provides filenames?
> 
>    On the mailing list would be preferable, as then the conversation
> is completely preserved in archives. They shouldn't be so long that
> vger rejects them. And yes, if you want to filter out the filenames,
> do so (but _just_ the filename -- don't remove the whole line).
> 
>    Hugo.
> 
>> Stefan
>>
>>
>>>    Hugo.
>>>
>>>> Greets,
>>>> Stefan
>>>> Am 10.05.2017 um 09:18 schrieb Roman Mamedov:
>>>>> On Wed, 10 May 2017 09:02:46 +0200
>>>>> Stefan Priebe - Profihost AG <s.priebe@profihost.ag> wrote:
>>>>>
>>>>>> how to fix bad key ordering?
>>>>>
>>>>> You should clarify does the FS in question mount (read-write? read-only?)
>>>>> and what are the kernel messages if it does not.
>>>>>
>>>
> 

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  9:20               ` Stefan Priebe - Profihost AG
@ 2017-05-10  9:54                 ` Hugo Mills
  2017-05-10 11:23                   ` Stefan Priebe - Profihost AG
  0 siblings, 1 reply; 16+ messages in thread
From: Hugo Mills @ 2017-05-10  9:54 UTC (permalink / raw)
  To: Stefan Priebe - Profihost AG; +Cc: Roman Mamedov, linux-btrfs@vger.kernel.org

[-- Attachment #1: Type: text/plain, Size: 7051 bytes --]

On Wed, May 10, 2017 at 11:20:58AM +0200, Stefan Priebe - Profihost AG wrote:
> Hello,
> 
> here's the output:
> # for block in 163316514816 163322413056 163325722624; do echo $block;
> btrfs-debug-tree -b $block /dev/mapper/crypt_md0|sed -re 's/(\t| )name:
> .*/\1name: HIDDEN/'; done
> 
> 163316514816
> btrfs-progs v4.8.5
> leaf 163316514816 items 188 free space 1387 generation 86739 owner 3892
> fs uuid 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
> chunk uuid b86efe94-ab40-4344-ac6b-46ec59c41b8f
[...]
>         item 37 key (23760 DIR_INDEX 36) itemoff 14278 itemsize 58
>                 location key (28124232 INODE_ITEM 0) type FILE
>                 transid 86739 data_len 0 name_len 28
>                 name: HIDDEN
>         item 38 key (23760 DIR_INDEX 37) itemoff 14220 itemsize 58
>                 location key (28124233 INODE_ITEM 0) type FILE
>                 transid 86739 data_len 0 name_len 28
>                 name: HIDDEN
>         item 39 key (23760 DIR_INDEX 38) itemoff 14165 itemsize 55
>                 location key (28124234 INODE_ITEM 0) type FILE
>                 transid 86739 data_len 0 name_len 25
>                 name: HIDDEN
>         item 40 key (23760 DIR_INDEX 22) itemoff 14115 itemsize 50
>                 location key (26923383 INODE_ITEM 0) type FILE
>                 transid 74009 data_len 0 name_len 20
>                 name: HIDDEN
>         item 41 key (23760 DIR_INDEX 23) itemoff 14067 itemsize 48
>                 location key (26923384 INODE_ITEM 0) type FILE
>                 transid 74009 data_len 0 name_len 18
>                 name: HIDDEN
[...]
> 163322413056
> btrfs-progs v4.8.5
> leaf 163322413056 items 113 free space 934 generation 86739 owner 3892
> fs uuid 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
> chunk uuid b86efe94-ab40-4344-ac6b-46ec59c41b8f
[...]
>         item 73 key (24016 DIR_INDEX 19) itemoff 9651 itemsize 62
>                 location key (28124251 INODE_ITEM 0) type FILE
>                 transid 86739 data_len 0 name_len 32
>                 name: HIDDEN
>         item 74 key (24016 DIR_INDEX 20) itemoff 9592 itemsize 59
>                 location key (28124252 INODE_ITEM 0) type FILE
>                 transid 86739 data_len 0 name_len 29
>                 name: HIDDEN
>         item 75 key (24016 DIR_INDEX 4) itemoff 9538 itemsize 54
>                 location key (26923401 INODE_ITEM 0) type FILE
>                 transid 74009 data_len 0 name_len 24
>                 name: HIDDEN
>         item 76 key (24016 DIR_INDEX 5) itemoff 9486 itemsize 52
>                 location key (26923402 INODE_ITEM 0) type FILE
>                 transid 74009 data_len 0 name_len 22
>                 name: HIDDEN
[...]
> 163325722624
> btrfs-progs v4.8.5
> leaf 163325722624 items 78 free space 6563 generation 86739 owner 3892
> fs uuid 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
> chunk uuid b86efe94-ab40-4344-ac6b-46ec59c41b8f
[...]
>         item 62 key (24189 DIR_INDEX 16) itemoff 9409 itemsize 64
>                 location key (28124267 INODE_ITEM 0) type FILE
>                 transid 86739 data_len 0 name_len 34
>                 name: HIDDEN
>         item 63 key (24189 DIR_INDEX 17) itemoff 9349 itemsize 60
>                 location key (28124268 INODE_ITEM 0) type FILE
>                 transid 86739 data_len 0 name_len 30
>                 name: HIDDEN
>         item 64 key (24189 DIR_INDEX 4) itemoff 9296 itemsize 53
>                 location key (26923421 INODE_ITEM 0) type FILE
>                 transid 74010 data_len 0 name_len 23
>                 name: HIDDEN
>         item 65 key (24189 DIR_INDEX 5) itemoff 9236 itemsize 60
>                 location key (26923422 INODE_ITEM 0) type FILE
>                 transid 74010 data_len 0 name_len 30
>                 name: HIDDEN
[...]

   In each case, the tree node keys have simply been sorted
incorrectly -- the ordering is otherwise correct, but jumps backwards
at some point in the sequence. At least in the first instance, some of
the keys appear to have been duplicated: there are two (23760
DIR_INDEX 22) keys in the list. (I didn't check in detail with the
other two whether there are duplicates, but I wouldn't be surprised).

   I note that the jump in the keys in the first two cases is 16, and
the jump in the third case is 13. That _might_ suggest some kind of
bit-level error, but it's probably not in the RAM that was used to
store the blocks, as the error appears in a different place in each
block.

   I'm tentatively going to point the finger at your hardware for
this. It's probably going to need something really long and/or
stressful to pick it up, though (one of the CPU stress tests, for
example, and also a good long run with a RAM tester -- 24 hours or
longer).

   Hugo.

> Stefan
> Am 10.05.2017 um 11:08 schrieb Hugo Mills:
> > On Wed, May 10, 2017 at 10:40:31AM +0200, Stefan Priebe - Profihost AG wrote:
> >> Am 10.05.2017 um 09:40 schrieb Hugo Mills:
> >>> On Wed, May 10, 2017 at 09:36:30AM +0200, Stefan Priebe - Profihost AG wrote:
> >>>> Hello Roman,
> >>>>
> >>>> the FS is mountable. It just goes readonly when trying to write some data.
> >>>>
> >>>> The kernel msgs are:
> >>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> >>>> block=163316514816,root=1, slot=39
> >>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> >>>> block=163322413056,root=1, slot=74
> >>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> >>>> block=163325722624,root=1, slot=63
> >>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
> >>>> block=163316514816,root=1, slot=39
> >>>> BTRFS: error (device dm-2) in btrfs_drop_snapshot:8839: errno=-5 IO failure
> >>>> BTRFS info (device dm-2): forced readonly
> >>>> BTRFS info (device dm-2): delayed_refs has NO entry
> >>>
> >>>    Can you show the output of btrfs-debug-tree -b <blocknum>, where
> >>> <blocknum> is each of the three "block=" values above?
> >>
> >> Can do that. But the lists are very long - should i upload them to
> >> pastebin? Is it ok to remove the name atribute - which provides filenames?
> > 
> >    On the mailing list would be preferable, as then the conversation
> > is completely preserved in archives. They shouldn't be so long that
> > vger rejects them. And yes, if you want to filter out the filenames,
> > do so (but _just_ the filename -- don't remove the whole line).
> > 
> >    Hugo.
> > 
> >> Stefan
> >>
> >>
> >>>    Hugo.
> >>>
> >>>> Greets,
> >>>> Stefan
> >>>> Am 10.05.2017 um 09:18 schrieb Roman Mamedov:
> >>>>> On Wed, 10 May 2017 09:02:46 +0200
> >>>>> Stefan Priebe - Profihost AG <s.priebe@profihost.ag> wrote:
> >>>>>
> >>>>>> how to fix bad key ordering?
> >>>>>
> >>>>> You should clarify does the FS in question mount (read-write? read-only?)
> >>>>> and what are the kernel messages if it does not.
> >>>>>
> >>>
> > 

-- 
Hugo Mills             | Alert status mauve ocelot: Slight chance of
hugo@... carfax.org.uk | brimstone. Be prepared to make a nice cup of tea.
http://carfax.org.uk/  |
PGP: E2AB1DE4          |

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  9:54                 ` Hugo Mills
@ 2017-05-10 11:23                   ` Stefan Priebe - Profihost AG
  0 siblings, 0 replies; 16+ messages in thread
From: Stefan Priebe - Profihost AG @ 2017-05-10 11:23 UTC (permalink / raw)
  To: Hugo Mills, Roman Mamedov, linux-btrfs@vger.kernel.org

Hello,

thanks. But is there any way to recover from this error? Like removing
the item or so? Data loss isn't a problem. Just reconstructing the whole
FS will take quite a long time.

Stefan

Am 10.05.2017 um 11:54 schrieb Hugo Mills:
> On Wed, May 10, 2017 at 11:20:58AM +0200, Stefan Priebe - Profihost AG wrote:
>> Hello,
>>
>> here's the output:
>> # for block in 163316514816 163322413056 163325722624; do echo $block;
>> btrfs-debug-tree -b $block /dev/mapper/crypt_md0|sed -re 's/(\t| )name:
>> .*/\1name: HIDDEN/'; done
>>
>> 163316514816
>> btrfs-progs v4.8.5
>> leaf 163316514816 items 188 free space 1387 generation 86739 owner 3892
>> fs uuid 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
>> chunk uuid b86efe94-ab40-4344-ac6b-46ec59c41b8f
> [...]
>>         item 37 key (23760 DIR_INDEX 36) itemoff 14278 itemsize 58
>>                 location key (28124232 INODE_ITEM 0) type FILE
>>                 transid 86739 data_len 0 name_len 28
>>                 name: HIDDEN
>>         item 38 key (23760 DIR_INDEX 37) itemoff 14220 itemsize 58
>>                 location key (28124233 INODE_ITEM 0) type FILE
>>                 transid 86739 data_len 0 name_len 28
>>                 name: HIDDEN
>>         item 39 key (23760 DIR_INDEX 38) itemoff 14165 itemsize 55
>>                 location key (28124234 INODE_ITEM 0) type FILE
>>                 transid 86739 data_len 0 name_len 25
>>                 name: HIDDEN
>>         item 40 key (23760 DIR_INDEX 22) itemoff 14115 itemsize 50
>>                 location key (26923383 INODE_ITEM 0) type FILE
>>                 transid 74009 data_len 0 name_len 20
>>                 name: HIDDEN
>>         item 41 key (23760 DIR_INDEX 23) itemoff 14067 itemsize 48
>>                 location key (26923384 INODE_ITEM 0) type FILE
>>                 transid 74009 data_len 0 name_len 18
>>                 name: HIDDEN
> [...]
>> 163322413056
>> btrfs-progs v4.8.5
>> leaf 163322413056 items 113 free space 934 generation 86739 owner 3892
>> fs uuid 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
>> chunk uuid b86efe94-ab40-4344-ac6b-46ec59c41b8f
> [...]
>>         item 73 key (24016 DIR_INDEX 19) itemoff 9651 itemsize 62
>>                 location key (28124251 INODE_ITEM 0) type FILE
>>                 transid 86739 data_len 0 name_len 32
>>                 name: HIDDEN
>>         item 74 key (24016 DIR_INDEX 20) itemoff 9592 itemsize 59
>>                 location key (28124252 INODE_ITEM 0) type FILE
>>                 transid 86739 data_len 0 name_len 29
>>                 name: HIDDEN
>>         item 75 key (24016 DIR_INDEX 4) itemoff 9538 itemsize 54
>>                 location key (26923401 INODE_ITEM 0) type FILE
>>                 transid 74009 data_len 0 name_len 24
>>                 name: HIDDEN
>>         item 76 key (24016 DIR_INDEX 5) itemoff 9486 itemsize 52
>>                 location key (26923402 INODE_ITEM 0) type FILE
>>                 transid 74009 data_len 0 name_len 22
>>                 name: HIDDEN
> [...]
>> 163325722624
>> btrfs-progs v4.8.5
>> leaf 163325722624 items 78 free space 6563 generation 86739 owner 3892
>> fs uuid 37b15dd8-b2e1-4585-98d0-cc0fa2a5a7c9
>> chunk uuid b86efe94-ab40-4344-ac6b-46ec59c41b8f
> [...]
>>         item 62 key (24189 DIR_INDEX 16) itemoff 9409 itemsize 64
>>                 location key (28124267 INODE_ITEM 0) type FILE
>>                 transid 86739 data_len 0 name_len 34
>>                 name: HIDDEN
>>         item 63 key (24189 DIR_INDEX 17) itemoff 9349 itemsize 60
>>                 location key (28124268 INODE_ITEM 0) type FILE
>>                 transid 86739 data_len 0 name_len 30
>>                 name: HIDDEN
>>         item 64 key (24189 DIR_INDEX 4) itemoff 9296 itemsize 53
>>                 location key (26923421 INODE_ITEM 0) type FILE
>>                 transid 74010 data_len 0 name_len 23
>>                 name: HIDDEN
>>         item 65 key (24189 DIR_INDEX 5) itemoff 9236 itemsize 60
>>                 location key (26923422 INODE_ITEM 0) type FILE
>>                 transid 74010 data_len 0 name_len 30
>>                 name: HIDDEN
> [...]
> 
>    In each case, the tree node keys have simply been sorted
> incorrectly -- the ordering is otherwise correct, but jumps backwards
> at some point in the sequence. At least in the first instance, some of
> the keys appear to have been duplicated: there are two (23760
> DIR_INDEX 22) keys in the list. (I didn't check in detail with the
> other two whether there are duplicates, but I wouldn't be surprised).
> 
>    I note that the jump in the keys in the first two cases is 16, and
> the jump in the third case is 13. That _might_ suggest some kind of
> bit-level error, but it's probably not in the RAM that was used to
> store the blocks, as the error appears in a different place in each
> block.
> 
>    I'm tentatively going to point the finger at your hardware for
> this. It's probably going to need something really long and/or
> stressful to pick it up, though (one of the CPU stress tests, for
> example, and also a good long run with a RAM tester -- 24 hours or
> longer).
> 
>    Hugo.
> 
>> Stefan
>> Am 10.05.2017 um 11:08 schrieb Hugo Mills:
>>> On Wed, May 10, 2017 at 10:40:31AM +0200, Stefan Priebe - Profihost AG wrote:
>>>> Am 10.05.2017 um 09:40 schrieb Hugo Mills:
>>>>> On Wed, May 10, 2017 at 09:36:30AM +0200, Stefan Priebe - Profihost AG wrote:
>>>>>> Hello Roman,
>>>>>>
>>>>>> the FS is mountable. It just goes readonly when trying to write some data.
>>>>>>
>>>>>> The kernel msgs are:
>>>>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>>>>>> block=163316514816,root=1, slot=39
>>>>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>>>>>> block=163322413056,root=1, slot=74
>>>>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>>>>>> block=163325722624,root=1, slot=63
>>>>>> BTRFS critical (device dm-2): corrupt leaf, bad key order:
>>>>>> block=163316514816,root=1, slot=39
>>>>>> BTRFS: error (device dm-2) in btrfs_drop_snapshot:8839: errno=-5 IO failure
>>>>>> BTRFS info (device dm-2): forced readonly
>>>>>> BTRFS info (device dm-2): delayed_refs has NO entry
>>>>>
>>>>>    Can you show the output of btrfs-debug-tree -b <blocknum>, where
>>>>> <blocknum> is each of the three "block=" values above?
>>>>
>>>> Can do that. But the lists are very long - should i upload them to
>>>> pastebin? Is it ok to remove the name atribute - which provides filenames?
>>>
>>>    On the mailing list would be preferable, as then the conversation
>>> is completely preserved in archives. They shouldn't be so long that
>>> vger rejects them. And yes, if you want to filter out the filenames,
>>> do so (but _just_ the filename -- don't remove the whole line).
>>>
>>>    Hugo.
>>>
>>>> Stefan
>>>>
>>>>
>>>>>    Hugo.
>>>>>
>>>>>> Greets,
>>>>>> Stefan
>>>>>> Am 10.05.2017 um 09:18 schrieb Roman Mamedov:
>>>>>>> On Wed, 10 May 2017 09:02:46 +0200
>>>>>>> Stefan Priebe - Profihost AG <s.priebe@profihost.ag> wrote:
>>>>>>>
>>>>>>>> how to fix bad key ordering?
>>>>>>>
>>>>>>> You should clarify does the FS in question mount (read-write? read-only?)
>>>>>>> and what are the kernel messages if it does not.
>>>>>>>
>>>>>
>>>
> 

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: runtime btrfsck
  2017-05-10  8:52       ` Roman Mamedov
@ 2017-05-11 14:03         ` Duncan
  0 siblings, 0 replies; 16+ messages in thread
From: Duncan @ 2017-05-11 14:03 UTC (permalink / raw)
  To: linux-btrfs

Roman Mamedov posted on Wed, 10 May 2017 13:52:55 +0500 as excerpted:

> So even with a minor corruption (something wonky in just ONE block of a
> multi-terabyte FS) the answer is way too often "nuke the entire thing
> and restore from backups".

Just another case where my "keep it small enough to be maintainable" 
policy triggers.  If that double-digit-TB fs is instead broken along 
functional/logical lines into say a dozen 1 TB each fs and that single 
block is corrupted, it can only be corrupted in one of them, so 11 of the 
dozen will be fine, and nuking to restore from backups just the single 1 
TB filesystem of a dozen, instead of the single 12-TB fs, isn't such a 
big deal -- it remains realistically maintainable.

Of course if at your scale 12 TB... or 12000 TB... is considered 
maintainable, great, but then we'd be unlikely to be having this 
discussion...

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman


^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2017-05-11 14:03 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz follow: Atom feed
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2017-05-02  6:29 runtime btrfsck Stefan Priebe - Profihost AG
2017-05-06  5:56 ` Stefan Priebe - Profihost AG
2017-05-10  7:02   ` Stefan Priebe - Profihost AG
2017-05-10  7:18     ` Roman Mamedov
2017-05-10  7:36       ` Stefan Priebe - Profihost AG
2017-05-10  7:40         ` Hugo Mills
2017-05-10  8:40           ` Stefan Priebe - Profihost AG
2017-05-10  9:08             ` Hugo Mills
2017-05-10  9:20               ` Stefan Priebe - Profihost AG
2017-05-10  9:54                 ` Hugo Mills
2017-05-10 11:23                   ` Stefan Priebe - Profihost AG
2017-05-10  7:24     ` Marat Khalili
2017-05-10  7:48     ` Martin Steigerwald
2017-05-10  8:42       ` Stefan Priebe - Profihost AG
2017-05-10  8:52       ` Roman Mamedov
2017-05-11 14:03         ` Duncan

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