* read time tree block corruption with kernel 5.4.11
@ 2020-01-15 22:04 Oliver Freyermuth
2020-01-16 0:56 ` Qu Wenruo
2020-01-16 1:57 ` Christoph Anton Mitterer
0 siblings, 2 replies; 6+ messages in thread
From: Oliver Freyermuth @ 2020-01-15 22:04 UTC (permalink / raw)
To: linux-btrfs
Dear BTRFSers,
I have recently upgraded to 5.4.11 from a 5.3 kernel and now also hit the dreaded read time tree block corruption on one of my nodes :-(.
Memory tests show no issues (after few hours, I'll do longer tests later), and I had performed the last full scrub only two weeks ago (on Kernel 5.3) and no errors were found.
Backups (1 week old) are available, but I'd prefer to recover the filesystem unless you tell me it's a terminal illness.
Here's the excerpt from the kernel log:
----------
[ 65.995061] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
[ 65.995064] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
[ 66.986510] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
[ 66.986515] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
[ 66.986902] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
[ 66.986906] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
[ 66.987226] BTRFS info (device sdb1): scrub: not finished on devid 1 with status: -5
[ 70.656012] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
[ 70.656015] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
[ 70.656271] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
[ 70.656273] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
[ 70.656286] BTRFS: error (device sdb1) in btrfs_run_delayed_refs:2188: errno=-5 IO failure
[ 70.656289] BTRFS info (device sdb1): forced readonly
[ 70.656293] BTRFS warning (device sdb1): Skipping commit of aborted transaction.
[ 70.656295] BTRFS: error (device sdb1) in cleanup_transaction:1828: errno=-5 IO failure
----------
I subsequently rebooted into an initrd with the recent BTRFS progs 5.4.1, and ran "btrfs check" (without --repair).
I got (typed that by hand, so I hope I got everything right...):
----------
Opening file system to check...
Checking file system on /dev/sdb1
UUID: XXXXXXXX
[1/7] checking root items (0:00:05 elapsed, 3367568 items checked)
ERROR: invalid generation for extent 676227178496, have 18349846316030361600 expect (0, 368854)
[2/7] checking extents (00:00:53 elapsed, 339133 items checked)
ERROR: errors found in extent allocation tree or chunk allocation
----------
No other errors were reported (i.e. steps 3 to 7 ran fine), so that looks pretty consistent.
I presume this means the invalid generation in the single extent is the only visible issue.
As far as I understand, "btrfs check --repair" should be able to fix that starting from version 5.4.
Can you confirm it should be safe to run "btrfs check --repair" on that volume?
I've attached the output of dump-tree of the affected block at the end of the mail in case it's interesting.
Any other information which might be interesting to the developers?
Cheers and thanks,
Oliver
----------------------
btrfs insp dump-t -b 1209570770944 /dev/sdb1
btrfs-progs v5.4.1
leaf 1209570770944 items 189 free space 4168 generation 368774 owner EXTENT_TREE
leaf 1209570770944 flags 0x1(WRITTEN) backref revision 1
fs uuid 77ed8441-2919-4e70-802f-2df93dad2735
chunk uuid f8e2f634-065f-4ee9-b54a-6d6115e317e0
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: read time tree block corruption with kernel 5.4.11
2020-01-15 22:04 read time tree block corruption with kernel 5.4.11 Oliver Freyermuth
@ 2020-01-16 0:56 ` Qu Wenruo
2020-01-16 3:31 ` Oliver Freyermuth
2020-01-16 1:57 ` Christoph Anton Mitterer
1 sibling, 1 reply; 6+ messages in thread
From: Qu Wenruo @ 2020-01-16 0:56 UTC (permalink / raw)
To: Oliver Freyermuth, linux-btrfs
[-- Attachment #1.1: Type: text/plain, Size: 43201 bytes --]
On 2020/1/16 上午6:04, Oliver Freyermuth wrote:
> Dear BTRFSers,
>
> I have recently upgraded to 5.4.11 from a 5.3 kernel and now also hit the dreaded read time tree block corruption on one of my nodes :-(.
> Memory tests show no issues (after few hours, I'll do longer tests later), and I had performed the last full scrub only two weeks ago (on Kernel 5.3) and no errors were found.
> Backups (1 week old) are available, but I'd prefer to recover the filesystem unless you tell me it's a terminal illness.
>
> Here's the excerpt from the kernel log:
> ----------
> [ 65.995061] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
> [ 65.995064] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
> [ 66.986510] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
> [ 66.986515] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
> [ 66.986902] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
> [ 66.986906] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
> [ 66.987226] BTRFS info (device sdb1): scrub: not finished on devid 1 with status: -5
> [ 70.656012] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
> [ 70.656015] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
> [ 70.656271] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
> [ 70.656273] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
> [ 70.656286] BTRFS: error (device sdb1) in btrfs_run_delayed_refs:2188: errno=-5 IO failure
> [ 70.656289] BTRFS info (device sdb1): forced readonly
> [ 70.656293] BTRFS warning (device sdb1): Skipping commit of aborted transaction.
> [ 70.656295] BTRFS: error (device sdb1) in cleanup_transaction:1828: errno=-5 IO failure
> ----------
>
> I subsequently rebooted into an initrd with the recent BTRFS progs 5.4.1, and ran "btrfs check" (without --repair).
> I got (typed that by hand, so I hope I got everything right...):
> ----------
> Opening file system to check...
> Checking file system on /dev/sdb1
> UUID: XXXXXXXX
> [1/7] checking root items (0:00:05 elapsed, 3367568 items checked)
> ERROR: invalid generation for extent 676227178496, have 18349846316030361600 expect (0, 368854)
> [2/7] checking extents (00:00:53 elapsed, 339133 items checked)
> ERROR: errors found in extent allocation tree or chunk allocation
> ----------
> No other errors were reported (i.e. steps 3 to 7 ran fine), so that looks pretty consistent.
>
> I presume this means the invalid generation in the single extent is the only visible issue.
> As far as I understand, "btrfs check --repair" should be able to fix that starting from version 5.4.
>
> Can you confirm it should be safe to run "btrfs check --repair" on that volume?
Unfortunately, no.
Currently the only way to fix it is by --init-extent-tree, which can be
super super super slow.
Although --repair just won't do anything harmful.
Considering how slow --init-extent-tree is, I need to add proper fix
--repair, but that needs some time.
>
> I've attached the output of dump-tree of the affected block at the end of the mail in case it's interesting.
> Any other information which might be interesting to the developers?
Since it's a data extent, the safest way would be go back to v5.3, find
the inode owning this data extent, and just delete it.
To find out the inodes owning it, you can use the following command:
# btrfs ins logical-resolve 676227178496 /mnt/btrfs
Thanks,
Qu
>
> Cheers and thanks,
> Oliver
>
>
> ----------------------
>
> btrfs insp dump-t -b 1209570770944 /dev/sdb1
> btrfs-progs v5.4.1
> leaf 1209570770944 items 189 free space 4168 generation 368774 owner EXTENT_TREE
> leaf 1209570770944 flags 0x1(WRITTEN) backref revision 1
> fs uuid 77ed8441-2919-4e70-802f-2df93dad2735
> chunk uuid f8e2f634-065f-4ee9-b54a-6d6115e317e0
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: read time tree block corruption with kernel 5.4.11
2020-01-15 22:04 read time tree block corruption with kernel 5.4.11 Oliver Freyermuth
2020-01-16 0:56 ` Qu Wenruo
@ 2020-01-16 1:57 ` Christoph Anton Mitterer
2020-01-16 3:37 ` Oliver Freyermuth
1 sibling, 1 reply; 6+ messages in thread
From: Christoph Anton Mitterer @ 2020-01-16 1:57 UTC (permalink / raw)
To: linux-btrfs
On Wed, 2020-01-15 at 23:04 +0100, Oliver Freyermuth wrote:
> I have recently upgraded to 5.4.11 from a 5.3 kernel and now also hit
> the dreaded read time tree block corruption
Is there some known corruption bug in 5.4?
Thanks,
Chris.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: read time tree block corruption with kernel 5.4.11
2020-01-16 0:56 ` Qu Wenruo
@ 2020-01-16 3:31 ` Oliver Freyermuth
2020-01-16 3:45 ` Qu Wenruo
0 siblings, 1 reply; 6+ messages in thread
From: Oliver Freyermuth @ 2020-01-16 3:31 UTC (permalink / raw)
To: Qu Wenruo, linux-btrfs
[-- Attachment #1.1: Type: text/plain, Size: 44804 bytes --]
Dear Qu,
Am 16.01.20 um 01:56 schrieb Qu Wenruo:
>
>
> On 2020/1/16 上午6:04, Oliver Freyermuth wrote:
>> Dear BTRFSers,
>>
>> I have recently upgraded to 5.4.11 from a 5.3 kernel and now also hit the dreaded read time tree block corruption on one of my nodes :-(.
>> Memory tests show no issues (after few hours, I'll do longer tests later), and I had performed the last full scrub only two weeks ago (on Kernel 5.3) and no errors were found.
>> Backups (1 week old) are available, but I'd prefer to recover the filesystem unless you tell me it's a terminal illness.
>>
>> Here's the excerpt from the kernel log:
>> ----------
>> [ 65.995061] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
>> [ 65.995064] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
>> [ 66.986510] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
>> [ 66.986515] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
>> [ 66.986902] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
>> [ 66.986906] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
>> [ 66.987226] BTRFS info (device sdb1): scrub: not finished on devid 1 with status: -5
>> [ 70.656012] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
>> [ 70.656015] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
>> [ 70.656271] BTRFS critical (device sdb1): corrupt leaf: block=1209570770944 slot=117 extent bytenr=676227178496 len=4096 invalid generation, have 18349846316030361600 expect (0, 368845]
>> [ 70.656273] BTRFS error (device sdb1): block=1209570770944 read time tree block corruption detected
>> [ 70.656286] BTRFS: error (device sdb1) in btrfs_run_delayed_refs:2188: errno=-5 IO failure
>> [ 70.656289] BTRFS info (device sdb1): forced readonly
>> [ 70.656293] BTRFS warning (device sdb1): Skipping commit of aborted transaction.
>> [ 70.656295] BTRFS: error (device sdb1) in cleanup_transaction:1828: errno=-5 IO failure
>> ----------
>>
>> I subsequently rebooted into an initrd with the recent BTRFS progs 5.4.1, and ran "btrfs check" (without --repair).
>> I got (typed that by hand, so I hope I got everything right...):
>> ----------
>> Opening file system to check...
>> Checking file system on /dev/sdb1
>> UUID: XXXXXXXX
>> [1/7] checking root items (0:00:05 elapsed, 3367568 items checked)
>> ERROR: invalid generation for extent 676227178496, have 18349846316030361600 expect (0, 368854)
>> [2/7] checking extents (00:00:53 elapsed, 339133 items checked)
>> ERROR: errors found in extent allocation tree or chunk allocation
>> ----------
>> No other errors were reported (i.e. steps 3 to 7 ran fine), so that looks pretty consistent.
>>
>> I presume this means the invalid generation in the single extent is the only visible issue.
>> As far as I understand, "btrfs check --repair" should be able to fix that starting from version 5.4.
>>
>> Can you confirm it should be safe to run "btrfs check --repair" on that volume?
>
> Unfortunately, no.
>
> Currently the only way to fix it is by --init-extent-tree, which can be
> super super super slow.
>
> Although --repair just won't do anything harmful.
> Considering how slow --init-extent-tree is, I need to add proper fix
> --repair, but that needs some time.
Thanks! There would be no high urgency for that machine, but I'll sleep better after fixing it,
so I went with your second suggestion.
>
>>
>> I've attached the output of dump-tree of the affected block at the end of the mail in case it's interesting.
>> Any other information which might be interesting to the developers?
>
> Since it's a data extent, the safest way would be go back to v5.3, find
> the inode owning this data extent, and just delete it.
>
> To find out the inodes owning it, you can use the following command:
> # btrfs ins logical-resolve 676227178496 /mnt/btrfs
Indeed, that helped :-). Many thanks!
Curiously, the affected directory was from 2014, which (I think) predates the last time I recreated the file system
(old data copied over), and should have been untouched since then. On a separate backup disk to which I btrfs-send snapshots from that machine,
the directory seems unaffected by the corruption.
Memory tests still don't reveal anything, so it's unclear what happened. I _think_ I had a situation of high memory pressure => OOM => hang on the machine
a few weeks ago, which would make it match an earlier problem with unexpected read tree block corruption somebody reported on this list,
but that might be a red herring.
Cheers and many thanks!
Oliver
>
> Thanks,
> Qu
>
>>
>> Cheers and thanks,
>> Oliver
>>
>>
>> ----------------------
>>
>> btrfs insp dump-t -b 1209570770944 /dev/sdb1
>> btrfs-progs v5.4.1
>> leaf 1209570770944 items 189 free space 4168 generation 368774 owner EXTENT_TREE
>> leaf 1209570770944 flags 0x1(WRITTEN) backref revision 1
>> fs uuid 77ed8441-2919-4e70-802f-2df93dad2735
>> chunk uuid f8e2f634-065f-4ee9-b54a-6d6115e317e0
>> item 0 key (676226424832 EXTENT_ITEM 8192) itemoff 16246 itemsize 37
>> refs 1 gen 160495 flags DATA
>> shared data backref parent 1208927469568 count 1
>> item 1 key (676226433024 EXTENT_ITEM 4096) itemoff 16209 itemsize 37
>> refs 1 gen 160495 flags DATA
>> shared data backref parent 984507351040 count 1
>> item 2 key (676226437120 EXTENT_ITEM 4096) itemoff 16172 itemsize 37
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>> shared data backref parent 985354911744 count 1
>> item 3 key (676226441216 EXTENT_ITEM 4096) itemoff 16106 itemsize 66
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>> extent data backref root 437 objectid 12776677 offset 4005888 count 1
>> shared data backref parent 824712167424 count 1
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>>
>
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: read time tree block corruption with kernel 5.4.11
2020-01-16 1:57 ` Christoph Anton Mitterer
@ 2020-01-16 3:37 ` Oliver Freyermuth
0 siblings, 0 replies; 6+ messages in thread
From: Oliver Freyermuth @ 2020-01-16 3:37 UTC (permalink / raw)
To: Christoph Anton Mitterer, linux-btrfs
Dear Chris,
Am 16.01.20 um 02:57 schrieb Christoph Anton Mitterer:
> On Wed, 2020-01-15 at 23:04 +0100, Oliver Freyermuth wrote:
>> I have recently upgraded to 5.4.11 from a 5.3 kernel and now also hit
>> the dreaded read time tree block corruption
>
> Is there some known corruption bug in 5.4?
I don't think so / don't know, but the tree checker became more sensitive as compared to 5.3, so I dreaded this message after I saw the density of such reports
from other users growing on the list in the past months.
My only overlap with an earlier report seems to be that I had a situation of high memory pressure in the past weeks on the machine.
Two other machines I run with very similar setups and significantly longer runtimes have not shown any issues.
The affected node has the lowest runtime of the three, "but it ran fine with Kernel 5.4 for a while" and now suddenly detected the corruption in old data extens quickly after bootup.
I don't find any issues with memtext86+.
So I'll keep an eye on the machine. At this point, anything else would be guesswork.
Cheers,
Oliver
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: read time tree block corruption with kernel 5.4.11
2020-01-16 3:31 ` Oliver Freyermuth
@ 2020-01-16 3:45 ` Qu Wenruo
0 siblings, 0 replies; 6+ messages in thread
From: Qu Wenruo @ 2020-01-16 3:45 UTC (permalink / raw)
To: Oliver Freyermuth, linux-btrfs
[-- Attachment #1.1: Type: text/plain, Size: 43294 bytes --]
On 2020/1/16 上午11:31, Oliver Freyermuth wrote:
> Dear Qu,
>
> Am 16.01.20 um 01:56 schrieb Qu Wenruo:
>>
>>
>> On 2020/1/16 上午6:04, Oliver Freyermuth wrote:
>>> Dear BTRFSers,
>>>
>>> I have recently upgraded to 5.4.11 from a 5.3 kernel and now also hit the dreaded read time tree block corruption on one of my nodes :-(.
>>> Memory tests show no issues (after few hours, I'll do longer tests later), and I had performed the last full scrub only two weeks ago (on Kernel 5.3) and no errors were found.
>>> Backups (1 week old) are available, but I'd prefer to recover the filesystem unless you tell me it's a terminal illness.
>>>
>>> Here's the excerpt from the kernel log:
>>> ----------
[...]
>>> No other errors were reported (i.e. steps 3 to 7 ran fine), so that looks pretty consistent.
>>>
>>> I presume this means the invalid generation in the single extent is the only visible issue.
>>> As far as I understand, "btrfs check --repair" should be able to fix that starting from version 5.4.
>>>
>>> Can you confirm it should be safe to run "btrfs check --repair" on that volume?
>>
>> Unfortunately, no.
>>
>> Currently the only way to fix it is by --init-extent-tree, which can be
>> super super super slow.
>>
>> Although --repair just won't do anything harmful.
>> Considering how slow --init-extent-tree is, I need to add proper fix
>> --repair, but that needs some time.
>
> Thanks! There would be no high urgency for that machine, but I'll sleep better after fixing it,
> so I went with your second suggestion.
>
>>
>>>
>>> I've attached the output of dump-tree of the affected block at the end of the mail in case it's interesting.
>>> Any other information which might be interesting to the developers?
>>
>> Since it's a data extent, the safest way would be go back to v5.3, find
>> the inode owning this data extent, and just delete it.
>>
>> To find out the inodes owning it, you can use the following command:
>> # btrfs ins logical-resolve 676227178496 /mnt/btrfs
>
> Indeed, that helped :-). Many thanks!
> Curiously, the affected directory was from 2014, which (I think) predates the last time I recreated the file system
> (old data copied over), and should have been untouched since then. On a separate backup disk to which I btrfs-send snapshots from that machine,
> the directory seems unaffected by the corruption.
Yes, that offending extent is modified by relocation, and such info is
not sent by btrfs-send, so backup is completely unaffected.
Considering the creation time, we found another 2014 corruption.
>
> Memory tests still don't reveal anything, so it's unclear what happened.
From all the info, nothing related to memory. But it's always good to
ensure your RAM is in good shape.
Thanks,
Qu
> I _think_ I had a situation of high memory pressure => OOM => hang on the machine
> a few weeks ago, which would make it match an earlier problem with unexpected read tree block corruption somebody reported on this list,
> but that might be a red herring.
>
> Cheers and many thanks!
> Oliver
>
>>
>> Thanks,
>> Qu
>>
>>>
>>> Cheers and thanks,
>>> Oliver
>>>
>>>
>>> ----------------------
>>>
>>> btrfs insp dump-t -b 1209570770944 /dev/sdb1
>>> btrfs-progs v5.4.1
>>> leaf 1209570770944 items 189 free space 4168 generation 368774 owner EXTENT_TREE
>>> leaf 1209570770944 flags 0x1(WRITTEN) backref revision 1
>>> fs uuid 77ed8441-2919-4e70-802f-2df93dad2735
>>> chunk uuid f8e2f634-065f-4ee9-b54a-6d6115e317e0
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>>
>
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 488 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-01-16 3:46 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-01-15 22:04 read time tree block corruption with kernel 5.4.11 Oliver Freyermuth
2020-01-16 0:56 ` Qu Wenruo
2020-01-16 3:31 ` Oliver Freyermuth
2020-01-16 3:45 ` Qu Wenruo
2020-01-16 1:57 ` Christoph Anton Mitterer
2020-01-16 3:37 ` Oliver Freyermuth
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