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* Help needed with filesystem errors: parent transid verify failed
@ 2021-03-28 15:40 B A
  2021-03-29  1:02 ` Chris Murphy
  2021-03-30  0:07 ` Chris Murphy
  0 siblings, 2 replies; 13+ messages in thread
From: B A @ 2021-03-28 15:40 UTC (permalink / raw)
  To: linux-btrfs

[-- Attachment #1: Type: text/plain, Size: 3416 bytes --]

Dear btrfs experts,


On my desktop PC, I have 1 btrfs partition on a single SSD device with 3 subvolumes (/, /home, /var). Whenever I boot my PC, after logging in to GNOME, the btrfs partition is being remounted as ro due to errors. This is the dmesg output at that time:

> [  616.155392] BTRFS error (device dm-0): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> [  616.155650] BTRFS error (device dm-0): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> [  616.155657] BTRFS: error (device dm-0) in __btrfs_free_extent:3054: errno=-5 IO failure
> [  616.155662] BTRFS info (device dm-0): forced readonly
> [  616.155665] BTRFS: error (device dm-0) in btrfs_run_delayed_refs:2124: errno=-5 IO failure

The issue started to happen today after login. Yesterday everything works fine. I suggest something went wrong on last shutdown but I don't know for sure because as this disk also has my logs, I don't see any errors on that shutdown in my logs.

System info:
* Fedora 33 x86_64
* kernel: Linux 5.11.10-200.fc33.x86_64 #1 SMP
* btrfs-progs v5.10 (5.10-1.fc33.x86_64)
* Samsung 840 series SSD (SMART data looks fine)

What happens:
1. I boot my PC including mounting the root partition
2. Everything works fine.
3. I can log in as root or my user on tty and do basic stuff there and it works
4. I log in to my user account (gdm, GNOME shell). Alternatively, running e.g. `dnf history info last` also triggers the dmesg output shown above.
5. Many applications don't work any more. The common root cause seems to be that the filesystem is remounted readonly due to the errors noted above.

Basic info: see attached file "dmesg info.txt" (generated from Fedora live system)

What I've tried so far:
1. I ran `btrfs scrub` from live system. This errors out:

> [root@localhost-live liveuser]# btrfs scrub start -B /mnt
> ERROR: scrubbing /mnt failed for device id 1: ret=-1, errno=5 (Input/output error)
> scrub canceled for 1a149bda-057d-4775-ba66-1bf259fce9a5
> Scrub started:    Sun Mar 28 07:20:07 2021
> Status:           aborted
> Duration:         0:13:00
> Total to scrub:   269.06GiB
> Rate:             252.24MiB/s
> Error summary:    no errors found

At the same time, in `dmesg`, I see this:

> [ 7878.612534] BTRFS error (device dm-2): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> [ 7878.637673] BTRFS error (device dm-2): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> [ 7878.639459] BTRFS info (device dm-2): scrub: not finished on devid 1 with status: -5

2. I ran `btrfs check` (without repair) from live system. This also shows errors (see attached file "btrfs check.txt".


Side note: There is also a rare chance that this issue is triggered by a software update I did yesterday. This includes an update of systemd-246.10 to systemd-246.13 and kernel-5.11.8 to kernel-5.11.10.
Changes in systemd: https://src.fedoraproject.org/rpms/systemd/commits/f33
Changes in kernel: https://src.fedoraproject.org/rpms/kernel/commits/f33
Since this update has also been deployed to many other users (I am using stable channel) and I have not seen any related issues in Fedora's bugzilla and discourse, so I doubt this is related.


What shall I do now? Do I need any of the invasive methods (`btrfs rescue` or `btrfs check --repair`) and if yes, which method do I choose?

Kind regards,
Chris

[-- Attachment #2: btrfs check.txt --]
[-- Type: text/plain, Size: 2192 bytes --]

[root@localhost-live liveuser]# btrfs check /dev/mapper/luks-ff6e174f-4cd3-42a7-8ee5-47005dd077dc
Opening filesystem to check...
ERROR: /dev/mapper/luks-ff6e174f-4cd3-42a7-8ee5-47005dd077dc is currently mounted, use --force if you really intend to check the filesystem
[root@localhost-live liveuser]# btrfs check /dev/mapper/luks-ff6e174f-4cd3-42a7-8ee5-47005dd077dc
Opening filesystem to check...
Checking filesystem on /dev/mapper/luks-ff6e174f-4cd3-42a7-8ee5-47005dd077dc
UUID: 1a149bda-057d-4775-ba66-1bf259fce9a5
[1/7] checking root items
parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
Ignoring transid failure
ERROR: child eb corrupted: parent bytenr=1144881201152 item=14 parent level=1 child level=2
ERROR: failed to repair root items: Input/output error
[2/7] checking extents
parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
Ignoring transid failure
bad block 1144783093760
ERROR: errors found in extent allocation tree or chunk allocation
[3/7] checking free space cache
parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
Ignoring transid failure
ERROR: child eb corrupted: parent bytenr=1144881201152 item=14 parent level=1 child level=2
cache appears valid but isn't 1062040764416
[4/7] checking fs roots
[5/7] checking only csums items (without verifying data)
parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
Ignoring transid failure
ERROR: child eb corrupted: parent bytenr=1144881201152 item=14 parent level=1 child level=2
Error going to next leaf -5
csum exists for 1062926516224-1062935089152 but there is no extent record
ERROR: errors found in csum tree
[6/7] checking root refs
[7/7] checking quota groups skipped (not enabled on this FS)
ERROR: transid errors in file system
found 11738640384 bytes used, error(s) found
total csum bytes: 0
total tree bytes: 3719168
total fs tree bytes: 0
total extent tree bytes: 3522560
btree space waste bytes: 1056895
file data blocks allocated: 69992448
 referenced 69992448


[-- Attachment #3: btrfs info.txt --]
[-- Type: text/plain, Size: 569 bytes --]

[root@localhost-live liveuser]# btrfs --version
btrfs-progs v5.7
[root@localhost-live liveuser]# btrfs fi show
Label: 'fedora_chstpc-2'  uuid: 1a149bda-057d-4775-ba66-1bf259fce9a5
	Total devices 1 FS bytes used 230.46GiB
	devid    1 size 300.00GiB used 269.06GiB path /dev/mapper/luks-ff6e174f-4cd3-42a7-8ee5-47005dd077dc

[root@localhost-live liveuser]# btrfs fi df /mnt
Data, single: total=263.00GiB, used=228.47GiB
System, DUP: total=32.00MiB, used=48.00KiB
Metadata, DUP: total=3.00GiB, used=1.99GiB
GlobalReserve, single: total=397.25MiB, used=0.00B


^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-28 15:40 Help needed with filesystem errors: parent transid verify failed B A
@ 2021-03-29  1:02 ` Chris Murphy
  2021-03-29  1:12   ` Chris Murphy
                     ` (2 more replies)
  2021-03-30  0:07 ` Chris Murphy
  1 sibling, 3 replies; 13+ messages in thread
From: Chris Murphy @ 2021-03-29  1:02 UTC (permalink / raw)
  To: B A; +Cc: Btrfs BTRFS

On Sun, Mar 28, 2021 at 9:41 AM B A <chris.std@web.de> wrote:
>
> Dear btrfs experts,
>
>
> On my desktop PC, I have 1 btrfs partition on a single SSD device with 3 subvolumes (/, /home, /var). Whenever I boot my PC, after logging in to GNOME, the btrfs partition is being remounted as ro due to errors. This is the dmesg output at that time:
>
> > [  616.155392] BTRFS error (device dm-0): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> > [  616.155650] BTRFS error (device dm-0): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> > [  616.155657] BTRFS: error (device dm-0) in __btrfs_free_extent:3054: errno=-5 IO failure
> > [  616.155662] BTRFS info (device dm-0): forced readonly
> > [  616.155665] BTRFS: error (device dm-0) in btrfs_run_delayed_refs:2124: errno=-5 IO failure

transid error usually means something below Btrfs got the write
ordering wrong and one or more writes dropped, but the problem isn't
detected until later which means it's an older problem. What's the
oldest kernel this file system has been written with? That is, is it a
new Fedora 33 file system? Or older? Fedora 33 came with 5.8.15.

ERROR: child eb corrupted: parent bytenr=1144783093760 item=14 parent
level=1 child level=2
ERROR: child eb corrupted: parent bytenr=1144881201152 item=14 parent
level=1 child level=2

Can you post the output from both:

btrfs insp dump-t -b 1144783093760 /dev/dm-0
btrfs insp dump-t -b 1144881201152 /dev/dm-0

> What shall I do now? Do I need any of the invasive methods (`btrfs rescue` or `btrfs check --repair`) and if yes, which method do I choose?

No repairs yet until we know what's wrong and if it's safe to try to repair it.

In the meantime I highly recommend refreshing backups of /home in case
this can't be repaired. It might be easier to do this with a Live USB
boot of Fedora 33, and use 'mount -o ro,subvol=home /dev/dm-0
/mnt/home' to mount your home read-only to get a backup. Live
environment will be more cooperative.


--
Chris Murphy

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-29  1:02 ` Chris Murphy
@ 2021-03-29  1:12   ` Chris Murphy
  2021-03-29  7:34   ` Aw: " B A
  2021-03-29  7:36   ` Aw: " B A
  2 siblings, 0 replies; 13+ messages in thread
From: Chris Murphy @ 2021-03-29  1:12 UTC (permalink / raw)
  To: Chris Murphy; +Cc: B A, Btrfs BTRFS

On Sun, Mar 28, 2021 at 7:02 PM Chris Murphy <lists@colorremedies.com> wrote:
>
> Can you post the output from both:
>
> btrfs insp dump-t -b 1144783093760 /dev/dm-0
> btrfs insp dump-t -b 1144881201152 /dev/dm-0

I'm not sure if those dumps will contain filenames, so check them.
It's ok to remove filenames before posting the output. You can also
use the option --hide-names.

btrfs insp dump-t --hide-names -b 1144783093760 /dev/dm-0

It may be a good idea to do a memory test as well.


-- 
Chris Murphy

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Aw: Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-29  1:02 ` Chris Murphy
  2021-03-29  1:12   ` Chris Murphy
@ 2021-03-29  7:34   ` B A
  2021-03-29  8:09     ` Chris Murphy
  2021-03-29  7:36   ` Aw: " B A
  2 siblings, 1 reply; 13+ messages in thread
From: B A @ 2021-03-29  7:34 UTC (permalink / raw)
  To: Chris Murphy; +Cc: Btrfs BTRFS

[-- Attachment #1: Type: text/plain, Size: 3070 bytes --]

> Gesendet: Montag, 29. März 2021 um 01:02 Uhr
> Von: "Chris Murphy" <lists@colorremedies.com>
> An: "B A" <chris.std@web.de>
> Cc: "Btrfs BTRFS" <linux-btrfs@vger.kernel.org>
> Betreff: Re: Help needed with filesystem errors: parent transid verify failed
>
> On Sun, Mar 28, 2021 at 9:41 AM B A <chris.std@web.de> wrote:
> >
> > Dear btrfs experts,
> >
> >
> > On my desktop PC, I have 1 btrfs partition on a single SSD device with 3 subvolumes (/, /home, /var). Whenever I boot my PC, after logging in to GNOME, the btrfs partition is being remounted as ro due to errors. This is the dmesg output at that time:
> >
> > > [ 616.155392] BTRFS error (device dm-0): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> > > [ 616.155650] BTRFS error (device dm-0): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> > > [ 616.155657] BTRFS: error (device dm-0) in __btrfs_free_extent:3054: errno=-5 IO failure
> > > [ 616.155662] BTRFS info (device dm-0): forced readonly
> > > [ 616.155665] BTRFS: error (device dm-0) in btrfs_run_delayed_refs:2124: errno=-5 IO failure
>
> transid error usually means something below Btrfs got the write
> ordering wrong and one or more writes dropped, but the problem isn't
> detected until later which means it's an older problem. What's the
> oldest kernel this file system has been written with? That is, is it a
> new Fedora 33 file system? Or older? Fedora 33 came with 5.8.15.

This is a very old BTRFS filesystem created with Fedora *23* i.e. a linux kernel and btrfs-progs around version 4.2. It was probably created 2015-10-31 with Fedora 23 beta and kernel 4.2.4 or 4.2.5.

I ran `btrfs scrub` about a month ago without issues. I ran `btrfs check` maybe a year ago without issues. I also run `btrfs filesystem balance` from time to time (~once a year). None of these have shown the issue before. Does that mean that the issue has not been present for a long time (>1 year)?

> ERROR: child eb corrupted: parent bytenr=1144783093760 item=14 parent
> level=1 child level=2
> ERROR: child eb corrupted: parent bytenr=1144881201152 item=14 parent
> level=1 child level=2
>
> Can you post the output from both:
>
> btrfs insp dump-t -b 1144783093760 /dev/dm-0

See attached file "btrfs_insp_dump-t_-b_x60.txt"

> btrfs insp dump-t -b 1144881201152 /dev/dm-0

See attached file "btrfs_insp_dump-t_-b_x52.txt"

> > What shall I do now? Do I need any of the invasive methods (`btrfs rescue` or `btrfs check --repair`) and if yes, which method do I choose?
>
> No repairs yet until we know what's wrong and if it's safe to try to repair it.
>
> In the meantime I highly recommend refreshing backups of /home in case
> this can't be repaired. It might be easier to do this with a Live USB
> boot of Fedora 33, and use 'mount -o ro,subvol=home /dev/dm-0
> /mnt/home' to mount your home read-only to get a backup. Live
> environment will be more cooperative.
> --
> Chris Murphy

Thanks for your help so far!

Kind regards,
Chris

[-- Attachment #2: btrfs_insp_dump-t_-b_x52.txt --]
[-- Type: text/plain, Size: 23567 bytes --]

btrfs-progs v5.10
node 1144881201152 level 1 items 326 free space 167 generation 2734383 owner EXTENT_TREE
node 1144881201152 flags 0x1(WRITTEN) backref revision 1
fs uuid 1a149bda-057d-4775-ba66-1bf259fce9a5
chunk uuid 66e88af8-618f-4dc9-8b88-908eb1904318
	key (1062040764416 EXTENT_ITEM 134217728) block 1144757714944 gen 2734382
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[-- Attachment #3: btrfs_insp_dump-t_-b_x60.txt --]
[-- Type: text/plain, Size: 5719 bytes --]

btrfs-progs v5.10
node 1144783093760 level 2 items 70 free space 423 generation 2734305 owner CSUM_TREE
node 1144783093760 flags 0x1(WRITTEN) backref revision 1
fs uuid 1a149bda-057d-4775-ba66-1bf259fce9a5
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^ permalink raw reply	[flat|nested] 13+ messages in thread

* Aw: Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-29  1:02 ` Chris Murphy
  2021-03-29  1:12   ` Chris Murphy
  2021-03-29  7:34   ` Aw: " B A
@ 2021-03-29  7:36   ` B A
  2 siblings, 0 replies; 13+ messages in thread
From: B A @ 2021-03-29  7:36 UTC (permalink / raw)
  To: Btrfs BTRFS

[-- Attachment #1: Type: text/plain, Size: 3074 bytes --]

> Gesendet: Montag, 29. März 2021 um 01:02 Uhr
> Von: "Chris Murphy" <lists@colorremedies.com>
> An: "B A" <chris.std@web.de>
> Cc: "Btrfs BTRFS" <linux-btrfs@vger.kernel.org>
> Betreff: Re: Help needed with filesystem errors: parent transid verify failed
>
> On Sun, Mar 28, 2021 at 9:41 AM B A <chris.std@web.de> wrote:
> >
> > Dear btrfs experts,
> >
> >
> > On my desktop PC, I have 1 btrfs partition on a single SSD device with 3 subvolumes (/, /home, /var). Whenever I boot my PC, after logging in to GNOME, the btrfs partition is being remounted as ro due to errors. This is the dmesg output at that time:
> >
> > > [ 616.155392] BTRFS error (device dm-0): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> > > [ 616.155650] BTRFS error (device dm-0): parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
> > > [ 616.155657] BTRFS: error (device dm-0) in __btrfs_free_extent:3054: errno=-5 IO failure
> > > [ 616.155662] BTRFS info (device dm-0): forced readonly
> > > [ 616.155665] BTRFS: error (device dm-0) in btrfs_run_delayed_refs:2124: errno=-5 IO failure
>
> transid error usually means something below Btrfs got the write
> ordering wrong and one or more writes dropped, but the problem isn't
> detected until later which means it's an older problem. What's the
> oldest kernel this file system has been written with? That is, is it a
> new Fedora 33 file system? Or older? Fedora 33 came with 5.8.15.

This is a very old BTRFS filesystem created with Fedora *23* i.e. a linux kernel and btrfs-progs around version 4.2. It was probably created 2015-10-31 with Fedora 23 beta and kernel 4.2.4 or 4.2.5.

I ran `btrfs scrub` about a month ago without issues. I ran `btrfs check` maybe a year ago without issues. I also run `btrfs filesystem balance` from time to time (~once a year). None of these have shown the issue before. Does that mean that the issue has not been present for a long time (>1 year)?

> ERROR: child eb corrupted: parent bytenr=1144783093760 item=14 parent
> level=1 child level=2
> ERROR: child eb corrupted: parent bytenr=1144881201152 item=14 parent
> level=1 child level=2
>
> Can you post the output from both:
>
> btrfs insp dump-t -b 1144783093760 /dev/dm-0

See attached file "btrfs_insp_dump-t_[…]x60.txt"

> btrfs insp dump-t -b 1144881201152 /dev/dm-0

See attached file "btrfs_insp_dump-t_[…]x52.txt"

> > What shall I do now? Do I need any of the invasive methods (`btrfs rescue` or `btrfs check --repair`) and if yes, which method do I choose?
>
> No repairs yet until we know what's wrong and if it's safe to try to repair it.
>
> In the meantime I highly recommend refreshing backups of /home in case
> this can't be repaired. It might be easier to do this with a Live USB
> boot of Fedora 33, and use 'mount -o ro,subvol=home /dev/dm-0
> /mnt/home' to mount your home read-only to get a backup. Live
> environment will be more cooperative.
> --
> Chris Murphy

Thanks for your help so far!

Kind regards,
Chris

[-- Attachment #2: btrfs_insp_dump-t_-b_x52.txt --]
[-- Type: text/plain, Size: 23567 bytes --]

btrfs-progs v5.10
node 1144881201152 level 1 items 326 free space 167 generation 2734383 owner EXTENT_TREE
node 1144881201152 flags 0x1(WRITTEN) backref revision 1
fs uuid 1a149bda-057d-4775-ba66-1bf259fce9a5
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	key (1069634674688 EXTENT_ITEM 176128) block 1151574573056 gen 2731935
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	key (1069732782080 EXTENT_ITEM 4096) block 1151257460736 gen 2731876
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	key (1070306066432 EXTENT_ITEM 4096) block 1144982601728 gen 2732639
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	key (1070323265536 EXTENT_ITEM 94208) block 1144982716416 gen 2732639
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	key (1070333042688 EXTENT_ITEM 24576) block 1151221907456 gen 2734216
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	key (1070341824512 EXTENT_ITEM 65536) block 1146476724224 gen 2733807
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	key (1070376435712 EXTENT_ITEM 524288) block 1151196741632 gen 2734170
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	key (1070642524160 EXTENT_ITEM 4096) block 1152172032000 gen 2732445
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	key (1070650933248 EXTENT_ITEM 4096) block 1144800280576 gen 2734257
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	key (1070656614400 EXTENT_ITEM 8192) block 1151310331904 gen 2731877
	key (1070657945600 EXTENT_ITEM 4096) block 1151401148416 gen 2731888
	key (1070659387392 EXTENT_ITEM 20480) block 1151310512128 gen 2731877
	key (1070661054464 EXTENT_ITEM 8192) block 1151401197568 gen 2731888

[-- Attachment #3: btrfs_insp_dump-t_-b_x60.txt --]
[-- Type: text/plain, Size: 5719 bytes --]

btrfs-progs v5.10
node 1144783093760 level 2 items 70 free space 423 generation 2734305 owner CSUM_TREE
node 1144783093760 flags 0x1(WRITTEN) backref revision 1
fs uuid 1a149bda-057d-4775-ba66-1bf259fce9a5
chunk uuid 66e88af8-618f-4dc9-8b88-908eb1904318
	key (EXTENT_CSUM EXTENT_CSUM 1062040764416) block 1144804098048 gen 2734305
	key (EXTENT_CSUM EXTENT_CSUM 1064769859584) block 1144783241216 gen 2734305
	key (EXTENT_CSUM EXTENT_CSUM 1070103511040) block 1144785289216 gen 2734305
	key (EXTENT_CSUM EXTENT_CSUM 1074050744320) block 1144771477504 gen 2734305
	key (EXTENT_CSUM EXTENT_CSUM 1078070198272) block 1144785403904 gen 2734305
	key (EXTENT_CSUM EXTENT_CSUM 1082074660864) block 1144753274880 gen 2734305
	key (EXTENT_CSUM EXTENT_CSUM 1086078521344) block 1151305564160 gen 2734245
	key (EXTENT_CSUM EXTENT_CSUM 1090156187648) block 1144767594496 gen 2734256
	key (EXTENT_CSUM EXTENT_CSUM 1094199504896) block 1144792973312 gen 2734305
	key (EXTENT_CSUM EXTENT_CSUM 1098099412992) block 1151295504384 gen 2734245
	key (EXTENT_CSUM EXTENT_CSUM 1102087684096) block 1145813647360 gen 2733230
	key (EXTENT_CSUM EXTENT_CSUM 1106130649088) block 1145813893120 gen 2733230
	key (EXTENT_CSUM EXTENT_CSUM 1110043635712) block 1145918586880 gen 2733290
	key (EXTENT_CSUM EXTENT_CSUM 1114058866688) block 1151295668224 gen 2734245
	key (EXTENT_CSUM EXTENT_CSUM 1117943541760) block 1151311757312 gen 2734245
	key (EXTENT_CSUM EXTENT_CSUM 1121916235776) block 1151311855616 gen 2734245
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	key (EXTENT_CSUM EXTENT_CSUM 1129720139776) block 1151317114880 gen 2734249
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	key (EXTENT_CSUM EXTENT_CSUM 1137659944960) block 1145815629824 gen 2733230
	key (EXTENT_CSUM EXTENT_CSUM 1141572079616) block 1151254495232 gen 2734168
	key (EXTENT_CSUM EXTENT_CSUM 1147679002624) block 1146508132352 gen 2731865
	key (EXTENT_CSUM EXTENT_CSUM 1152534523904) block 1144893800448 gen 2732602
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	key (EXTENT_CSUM EXTENT_CSUM 1167837270016) block 1144886689792 gen 2732602
	key (EXTENT_CSUM EXTENT_CSUM 1171629219840) block 1151219122176 gen 2731874
	key (EXTENT_CSUM EXTENT_CSUM 1175476060160) block 1144886870016 gen 2732602
	key (EXTENT_CSUM EXTENT_CSUM 1179056308224) block 1151246581760 gen 2734242
	key (EXTENT_CSUM EXTENT_CSUM 1182810374144) block 1145835159552 gen 2733290
	key (EXTENT_CSUM EXTENT_CSUM 1186490675200) block 1151244681216 gen 2734235
	key (EXTENT_CSUM EXTENT_CSUM 1190107557888) block 1146010533888 gen 2733448
	key (EXTENT_CSUM EXTENT_CSUM 1193489453056) block 1144768528384 gen 2734256
	key (EXTENT_CSUM EXTENT_CSUM 1196942684160) block 1151302189056 gen 2734245
	key (EXTENT_CSUM EXTENT_CSUM 1200476745728) block 1145819742208 gen 2733230
	key (EXTENT_CSUM EXTENT_CSUM 1204090634240) block 1151302369280 gen 2734245
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	key (EXTENT_CSUM EXTENT_CSUM 1211249750016) block 1151426183168 gen 2731933
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	key (EXTENT_CSUM EXTENT_CSUM 1226173898752) block 1151302729728 gen 2734245
	key (EXTENT_CSUM EXTENT_CSUM 1229946892288) block 1146897137664 gen 2733290
	key (EXTENT_CSUM EXTENT_CSUM 1233785675776) block 1151302877184 gen 2734245
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	key (EXTENT_CSUM EXTENT_CSUM 1252778582016) block 1151428509696 gen 2731933
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	key (EXTENT_CSUM EXTENT_CSUM 1274339393536) block 1151285985280 gen 2734250
	key (EXTENT_CSUM EXTENT_CSUM 1277871861760) block 1146104119296 gen 2733523
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	key (EXTENT_CSUM EXTENT_CSUM 1294790905856) block 1146464387072 gen 2733803
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	key (EXTENT_CSUM EXTENT_CSUM 1300323385344) block 1144753651712 gen 2734305
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	key (EXTENT_CSUM EXTENT_CSUM 1309167861760) block 1151314804736 gen 2734249
	key (EXTENT_CSUM EXTENT_CSUM 1317585489920) block 1145021825024 gen 2729896
	key (EXTENT_CSUM EXTENT_CSUM 1323690971136) block 1151204327424 gen 2734218
	key (EXTENT_CSUM EXTENT_CSUM 1335426256896) block 1151205916672 gen 2731874
	key (EXTENT_CSUM EXTENT_CSUM 1340210253824) block 1146594689024 gen 2731866

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-29  7:34   ` Aw: " B A
@ 2021-03-29  8:09     ` Chris Murphy
  2021-03-29  8:42       ` Aw: " B A
  0 siblings, 1 reply; 13+ messages in thread
From: Chris Murphy @ 2021-03-29  8:09 UTC (permalink / raw)
  To: B A, Btrfs BTRFS; +Cc: Qu Wenruo, Josef Bacik

On Mon, Mar 29, 2021 at 1:34 AM B A <chris.std@web.de> wrote:
>
> This is a very old BTRFS filesystem created with Fedora *23* i.e. a linux kernel and btrfs-progs around version 4.2. It was probably created 2015-10-31 with Fedora 23 beta and kernel 4.2.4 or 4.2.5.
>
> I ran `btrfs scrub` about a month ago without issues. I ran `btrfs check` maybe a year ago without issues. I also run `btrfs filesystem balance` from time to time (~once a year). None of these have shown the issue before. Does that mean that the issue has not been present for a long time (>1 year)?

Maybe. The generation on these two leaves look recent. But kernels
since ~5.3 have a write time tree checker designed to catch metadata
errors before they are written.

What do you get for:

btrfs insp dump-s -f /dev/dm-0

Hopefully Qu or Josef will have an idea.

--
Chris Murphy

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Aw: Re: Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-29  8:09     ` Chris Murphy
@ 2021-03-29  8:42       ` B A
  2021-03-29 13:36         ` Josef Bacik
  0 siblings, 1 reply; 13+ messages in thread
From: B A @ 2021-03-29  8:42 UTC (permalink / raw)
  To: Chris Murphy, btrfs kernel mailing list; +Cc: Qu Wenruo, Josef Bacik

[-- Attachment #1: Type: text/plain, Size: 576 bytes --]

> Gesendet: Montag, 29. März 2021 um 08:09 Uhr
> Von: "Chris Murphy" <lists@colorremedies.com>
> An: "B A" <chris.std@web.de>, "Btrfs BTRFS" <linux-btrfs@vger.kernel.org>
> Cc: "Qu Wenruo" <quwenruo.btrfs@gmx.com>, "Josef Bacik" <josef@toxicpanda.com>
> Betreff: Re: Re: Help needed with filesystem errors: parent transid verify failed
> […]
> 
> What do you get for:
> 
> btrfs insp dump-s -f /dev/dm-0

See attached file "btrfs_insp_dump-s_-f.txt"

> Hopefully Qu or Josef will have an idea.
> 
> --
> Chris Murphy

Thanks again!

Kind regards,
Chris

[-- Attachment #2: btrfs_insp_dump-s_-f.txt --]
[-- Type: text/plain, Size: 3481 bytes --]

superblock: bytenr=65536, device=/dev/mapper/luks-ff6e174f-4cd3-42a7-8ee5-47005dd077dc
---------------------------------------------------------
csum_type		0 (crc32c)
csum_size		4
csum			0x0fcf13cc [match]
bytenr			65536
flags			0x1
			( WRITTEN )
magic			_BHRfS_M [match]
fsid			1a149bda-057d-4775-ba66-1bf259fce9a5
metadata_uuid		1a149bda-057d-4775-ba66-1bf259fce9a5
label			fedora_chstpc-2
generation		2734487
root			1144777555968
sys_array_size		129
chunk_root_generation	2708287
root_level		1
chunk_root		1144718917632
chunk_root_level	1
log_root		0
log_root_transid	0
log_root_level		0
total_bytes		322120450048
bytes_used		247510102016
sectorsize		4096
nodesize		16384
leafsize (deprecated)	16384
stripesize		4096
root_dir		6
num_devices		1
compat_flags		0x0
compat_ro_flags		0x0
incompat_flags		0x169
			( MIXED_BACKREF |
			  COMPRESS_LZO |
			  BIG_METADATA |
			  EXTENDED_IREF |
			  SKINNY_METADATA )
cache_generation	2734487
uuid_tree_generation	2734487
dev_item.uuid		f7c9ee7f-0de1-49bb-a838-fdc9b4111331
dev_item.fsid		1a149bda-057d-4775-ba66-1bf259fce9a5 [match]
dev_item.type		0
dev_item.total_bytes	322120450048
dev_item.bytes_used	288903659520
dev_item.io_align	4096
dev_item.io_width	4096
dev_item.sector_size	4096
dev_item.devid		1
dev_item.dev_group	0
dev_item.seek_speed	0
dev_item.bandwidth	0
dev_item.generation	0
sys_chunk_array[2048]:
	item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 1144718884864)
		length 33554432 owner 2 stripe_len 65536 type SYSTEM|DUP
		io_align 65536 io_width 65536 sector_size 4096
		num_stripes 2 sub_stripes 1
			stripe 0 devid 1 offset 1074790400
			dev_uuid f7c9ee7f-0de1-49bb-a838-fdc9b4111331
			stripe 1 devid 1 offset 1108344832
			dev_uuid f7c9ee7f-0de1-49bb-a838-fdc9b4111331
backup_roots[4]:
	backup 0:
		backup_tree_root:	1144895651840	gen: 2734484	level: 1
		backup_chunk_root:	1144718917632	gen: 2708287	level: 1
		backup_extent_root:	1144891129856	gen: 2734484	level: 2
		backup_fs_root:		1145036898304	gen: 2734355	level: 0
		backup_dev_root:	1144828215296	gen: 2734438	level: 1
		backup_csum_root:	1144889982976	gen: 2734484	level: 2
		backup_total_bytes:	322120450048
		backup_bytes_used:	247427117056
		backup_num_devices:	1

	backup 1:
		backup_tree_root:	1144902451200	gen: 2734485	level: 1
		backup_chunk_root:	1144718917632	gen: 2708287	level: 1
		backup_extent_root:	1144897241088	gen: 2734485	level: 2
		backup_fs_root:		1145036898304	gen: 2734355	level: 0
		backup_dev_root:	1144828215296	gen: 2734438	level: 1
		backup_csum_root:	1144891408384	gen: 2734485	level: 2
		backup_total_bytes:	322120450048
		backup_bytes_used:	247439462400
		backup_num_devices:	1

	backup 2:
		backup_tree_root:	1144915836928	gen: 2734486	level: 1
		backup_chunk_root:	1144718917632	gen: 2708287	level: 1
		backup_extent_root:	1144753078272	gen: 2734486	level: 2
		backup_fs_root:		0	gen: 0	level: 0
		backup_dev_root:	1144771723264	gen: 2734486	level: 1
		backup_csum_root:	1144755093504	gen: 2734486	level: 2
		backup_total_bytes:	322120450048
		backup_bytes_used:	247510102016
		backup_num_devices:	1

	backup 3:
		backup_tree_root:	1144777555968	gen: 2734487	level: 1
		backup_chunk_root:	1144718917632	gen: 2708287	level: 1
		backup_extent_root:	1144777916416	gen: 2734487	level: 2
		backup_fs_root:		0	gen: 0	level: 0
		backup_dev_root:	1144771723264	gen: 2734486	level: 1
		backup_csum_root:	1144809537536	gen: 2734487	level: 2
		backup_total_bytes:	322120450048
		backup_bytes_used:	247510102016
		backup_num_devices:	1



^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: Aw: Re: Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-29  8:42       ` Aw: " B A
@ 2021-03-29 13:36         ` Josef Bacik
  2021-04-01 12:36           ` Aw: " B A
  0 siblings, 1 reply; 13+ messages in thread
From: Josef Bacik @ 2021-03-29 13:36 UTC (permalink / raw)
  To: B A, Chris Murphy, btrfs kernel mailing list; +Cc: Qu Wenruo

On 3/29/21 4:42 AM, B A wrote:
>> Gesendet: Montag, 29. März 2021 um 08:09 Uhr
>> Von: "Chris Murphy" <lists@colorremedies.com>
>> An: "B A" <chris.std@web.de>, "Btrfs BTRFS" <linux-btrfs@vger.kernel.org>
>> Cc: "Qu Wenruo" <quwenruo.btrfs@gmx.com>, "Josef Bacik" <josef@toxicpanda.com>
>> Betreff: Re: Re: Help needed with filesystem errors: parent transid verify failed
>> […]
>>
>> What do you get for:
>>
>> btrfs insp dump-s -f /dev/dm-0
> 
> See attached file "btrfs_insp_dump-s_-f.txt"
> 

I'm on PTO this week so I'll be a little less responsive, but thankfully this is 
just the extent tree.  First thing is to make sure you've backed everything up, 
and then you should be able to just do btrfs check --repair and it should fix it 
for you.

However I've noticed some failure cases where it won't fix transid errors 
sometimes because it errors out trying to read the things.  If that happens just 
let me know, I have a private branch with fsck changes to address this class of 
problems and I can point you at that.  I'd rather wait to make sure the normal 
fsck won't work first tho, just in case.  Thanks,

Josef

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-28 15:40 Help needed with filesystem errors: parent transid verify failed B A
  2021-03-29  1:02 ` Chris Murphy
@ 2021-03-30  0:07 ` Chris Murphy
  2021-03-30  8:44   ` Aw: " B A
  1 sibling, 1 reply; 13+ messages in thread
From: Chris Murphy @ 2021-03-30  0:07 UTC (permalink / raw)
  To: B A; +Cc: Btrfs BTRFS

On Sun, Mar 28, 2021 at 9:41 AM B A <chris.std@web.de> wrote:
>
> * Samsung 840 series SSD (SMART data looks fine)

EVO or PRO? And what does its /proc/mounts line look like?

Total_LBAs_Written?


-- 
Chris Murphy

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Aw: Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-30  0:07 ` Chris Murphy
@ 2021-03-30  8:44   ` B A
  2021-03-30 20:17     ` Chris Murphy
  0 siblings, 1 reply; 13+ messages in thread
From: B A @ 2021-03-30  8:44 UTC (permalink / raw)
  To: Chris Murphy, btrfs kernel mailing list

[-- Attachment #1: Type: text/plain, Size: 1174 bytes --]


> Gesendet: Dienstag, 30. März 2021 um 00:07 Uhr
> Von: "Chris Murphy" <lists@colorremedies.com>
> An: "B A" <chris.std@web.de>
> Cc: "Btrfs BTRFS" <linux-btrfs@vger.kernel.org>
> Betreff: Re: Help needed with filesystem errors: parent transid verify failed
>
> On Sun, Mar 28, 2021 at 9:41 AM B A <chris.std@web.de> wrote:
> >
> > * Samsung 840 series SSD (SMART data looks fine)
> 
> EVO or PRO? And what does its /proc/mounts line look like?

Model is MZ-7TD500, which seems to be an EVO. Firmware is DXT08B0Q.

From /etc/fstab:

UUID=1a149bda-057d-4775-ba66-1bf259fce9a5 /        btrfs   subvol=root-f23,x-systemd.device-timeout=0,compress=lzo,ssd,noatime 0 0
UUID=1b1f5c60-57f3-435c-b73e-2de727a302e2 /boot    ext4    nosuid,noexec,nodev        1 2
UUID=1a149bda-057d-4775-ba66-1bf259fce9a5 /home    btrfs   subvol=home,x-systemd.device-timeout=0,compress=lzo,ssd,nosuid,nodev,noatime 0 0
UUID=1a149bda-057d-4775-ba66-1bf259fce9a5 /var     btrfs   subvol=var-f23,x-systemd.device-timeout=0,compress=lzo,ssd,nosuid,noexec,nodev,noatime 0 0

> Total_LBAs_Written?

Raw value: 92857573119
(full output in attached file)


Kind regards,
Chris

[-- Attachment #2: smartctl_-all.txt --]
[-- Type: text/plain, Size: 4555 bytes --]

smartctl 7.2 2021-01-17 r5171 [x86_64-linux-5.8.15-301.fc33.x86_64] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Samsung based SSDs
Device Model:     Samsung SSD 840 Series
Serial Number:    [removed]
LU WWN Device Id: [removed]
Firmware Version: DXT08B0Q
User Capacity:    500,107,862,016 bytes [500 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    Solid State Device
TRIM Command:     Available, deterministic, zeroed
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2, ATA8-ACS T13/1699-D revision 4c
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Tue Mar 30 04:37:16 2021 EDT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00)	Offline data collection activity
					was never started.
					Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0)	The previous self-test routine completed
					without error or no self-test has ever
					been run.
Total time to complete Offline
data collection: 		(53956) seconds.
Offline data collection
capabilities: 			 (0x53) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					No Offline surface scan supported.
					Self-test supported.
					No Conveyance Self-test supported.
					Selective Self-test supported.
SMART capabilities:            (0x0003)	Saves SMART data before entering
					power-saving mode.
					Supports SMART auto save timer.
Error logging capability:        (0x01)	Error logging supported.
					General Purpose Logging supported.
Short self-test routine
recommended polling time: 	 (   2) minutes.
Extended self-test routine
recommended polling time: 	 (  70) minutes.
SCT capabilities: 	       (0x003d)	SCT Status supported.
					SCT Error Recovery Control supported.
					SCT Feature Control supported.
					SCT Data Table supported.

SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
  9 Power_On_Hours          0x0032   097   097   000    Old_age   Always       -       12588
 12 Power_Cycle_Count       0x0032   091   091   000    Old_age   Always       -       8958
177 Wear_Leveling_Count     0x0013   089   089   000    Pre-fail  Always       -       131
179 Used_Rsvd_Blk_Cnt_Tot   0x0013   100   100   010    Pre-fail  Always       -       0
181 Program_Fail_Cnt_Total  0x0032   100   100   010    Old_age   Always       -       0
182 Erase_Fail_Count_Total  0x0032   100   100   010    Old_age   Always       -       0
183 Runtime_Bad_Block       0x0013   100   100   010    Pre-fail  Always       -       0
187 Uncorrectable_Error_Cnt 0x0032   100   100   000    Old_age   Always       -       0
190 Airflow_Temperature_Cel 0x0032   073   051   000    Old_age   Always       -       27
195 ECC_Error_Rate          0x001a   200   200   000    Old_age   Always       -       0
199 CRC_Error_Count         0x003e   099   099   000    Old_age   Always       -       4
235 POR_Recovery_Count      0x0012   099   099   000    Old_age   Always       -       1958
241 Total_LBAs_Written      0x0032   099   099   000    Old_age   Always       -       92857573119

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%      1935         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
  255        0    65535  Read_scanning was never started
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.


^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-30  8:44   ` Aw: " B A
@ 2021-03-30 20:17     ` Chris Murphy
  2021-04-01 12:42       ` Aw: " B A
  0 siblings, 1 reply; 13+ messages in thread
From: Chris Murphy @ 2021-03-30 20:17 UTC (permalink / raw)
  To: B A; +Cc: Chris Murphy, btrfs kernel mailing list

On Tue, Mar 30, 2021 at 2:44 AM B A <chris.std@web.de> wrote:
>
>
> > Gesendet: Dienstag, 30. März 2021 um 00:07 Uhr
> > Von: "Chris Murphy" <lists@colorremedies.com>
> > An: "B A" <chris.std@web.de>
> > Cc: "Btrfs BTRFS" <linux-btrfs@vger.kernel.org>
> > Betreff: Re: Help needed with filesystem errors: parent transid verify failed
> >
> > On Sun, Mar 28, 2021 at 9:41 AM B A <chris.std@web.de> wrote:
> > >
> > > * Samsung 840 series SSD (SMART data looks fine)
> >
> > EVO or PRO? And what does its /proc/mounts line look like?
>
> Model is MZ-7TD500, which seems to be an EVO. Firmware is DXT08B0Q.

For me smartctl reports
Device Model:     Samsung SSD 840 EVO 250GB
Firmware Version: EXT0DB6Q

Yours might be a PRO or it could just be a different era EVO. Last I
checked, Samsung had no firmware updates on their website for the 840
EVO. While I'm aware of some minor firmware bugs related to smartctl
testing, so far I've done well over 100 pull the power cord tests
while doing heavy writes (with Btrfs), and have never had a problem.
So I'd say there's probably not a "per se" problem with this model.
Best guess is that since the leaves pass checksum, it's not
corruption, but some SSD equivalent of a misdirected write (?) if
that's possible. It just looks like these two leaves are in the wrong
place.


> > Total_LBAs_Written?
>
> Raw value:
92857573119

OK I'm at 33063832698

Well hopefully --repair will fix it (let us know either way) and if
not, then we'll see what Josef can come up with, or alternatively you
can just mkfs and restore from backups which will surely be faster.


-- 
Chris Murphy

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Aw: Re:  Re: Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-29 13:36         ` Josef Bacik
@ 2021-04-01 12:36           ` B A
  0 siblings, 0 replies; 13+ messages in thread
From: B A @ 2021-04-01 12:36 UTC (permalink / raw)
  To: Josef Bacik, btrfs kernel mailing list; +Cc: Chris Murphy, Qu Wenruo



> Gesendet: Montag, 29. März 2021 um 13:36 Uhr
> Von: "Josef Bacik" <josef@toxicpanda.com>
> An: "B A" <chris.std@web.de>, "Chris Murphy" <lists@colorremedies.com>, "btrfs kernel mailing list" <linux-btrfs@vger.kernel.org>
> Cc: "Qu Wenruo" <quwenruo.btrfs@gmx.com>
> Betreff: Re: Aw: Re: Re: Help needed with filesystem errors: parent transid verify failed
> 
> I'm on PTO this week so I'll be a little less responsive, but thankfully this is 
> just the extent tree.  First thing is to make sure you've backed everything up, 
> and then you should be able to just do btrfs check --repair and it should fix it 
> for you.

Sadly, it does not:

# btrfs check --repair --progress
enabling repair mode
[usage warning]
Starting repair.
Opening filesystem to check...
Checking filesystem on /dev/mapper/luks-ff6e174f-4cd3-42a7-8ee5-47005dd077dc
UUID: 1a149bda-057d-4775-ba66-1bf259fce9a5
repair mode will force to clear out log tree, are you sure? [y/N]: [1/7] checking root items                      (0:0parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
parent transid verify failed on 1144783093760 wanted 2734307 found 2734305
Ignoring transid failure
ERROR: child eb corrupted: parent bytenr=1145025249280 item=14 parent level=1 child level=2
ERROR: [1/7] checking root items                      (0:00:00 elapsed, 2657 items checked)
failed to repair root items: Input/output error

> However I've noticed some failure cases where it won't fix transid errors 
> sometimes because it errors out trying to read the things.  If that happens just 
> let me know, I have a private branch with fsck changes to address this class of 
> problems and I can point you at that.  I'd rather wait to make sure the normal 
> fsck won't work first tho, just in case.

Since I do have plenty of backups and it seems like the filesystem is still readable, I think I'd rather delete the filesystem and create a fresh one. I don't want to take more of your time here, unless you do want to know more details for testing your changes. Thanks for all the hints so far!

Many thanks altogether!

Kind regards,
Chris

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Aw: Re: Re: Help needed with filesystem errors: parent transid verify failed
  2021-03-30 20:17     ` Chris Murphy
@ 2021-04-01 12:42       ` B A
  0 siblings, 0 replies; 13+ messages in thread
From: B A @ 2021-04-01 12:42 UTC (permalink / raw)
  To: btrfs kernel mailing list; +Cc: Chris Murphy

Hi Chris,

> Gesendet: Dienstag, 30. März 2021 um 20:17 Uhr
> Von: "Chris Murphy" <lists@colorremedies.com>
>
> On Tue, Mar 30, 2021 at 2:44 AM B A <chris.std@web.de> wrote:
> >
> > > Gesendet: Dienstag, 30. März 2021 um 00:07 Uhr
> > > Von: "Chris Murphy" <lists@colorremedies.com>
> > > […]
> > > EVO or PRO? And what does its /proc/mounts line look like?
> >
> > Model is MZ-7TD500, which seems to be an EVO. Firmware is DXT08B0Q.
> 
> For me smartctl reports
> Device Model:     Samsung SSD 840 EVO 250GB
> Firmware Version: EXT0DB6Q
> 
> Yours might be a PRO or it could just be a different era EVO. Last I
> checked, Samsung had no firmware updates on their website for the 840
> EVO. While I'm aware of some minor firmware bugs related to smartctl
> testing, so far I've done well over 100 pull the power cord tests
> while doing heavy writes (with Btrfs), and have never had a problem.
> So I'd say there's probably not a "per se" problem with this model.
> Best guess is that since the leaves pass checksum, it's not
> corruption, but some SSD equivalent of a misdirected write (?) if
> that's possible. It just looks like these two leaves are in the wrong
> place.

I'd rather go with the theory you (indirectly) raised a few days ago that my RAM may misbehave (when you suggested I run memtest). This is rather possible because I had difficulties understanding my BIOS and at some point I have accidentally enabled some overclocking. As I know this may cause the RAM to misbehave (and I don't have ECC RAM), this may as well be the reason.

> 
> > > Total_LBAs_Written?
> >
> > Raw value:
> 92857573119
> 
> OK I'm at 33063832698
> 
> Well hopefully --repair will fix it (let us know either way) and if
> not, then we'll see what Josef can come up with, or alternatively you
> can just mkfs and restore from backups which will surely be faster.

Sadly it didn't (see other e-mail) but I think I'll go for the latter (mkfs and restore from backups) as I *think* my backups are fine and I don't want to waste more of your time (unless Josef wants to get his changes tested).

Thanks very much so far for the support and thanks for maintaining BTRFS :-)

Kind regards,
Chris

^ permalink raw reply	[flat|nested] 13+ messages in thread

end of thread, other threads:[~2021-04-01 20:18 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-03-28 15:40 Help needed with filesystem errors: parent transid verify failed B A
2021-03-29  1:02 ` Chris Murphy
2021-03-29  1:12   ` Chris Murphy
2021-03-29  7:34   ` Aw: " B A
2021-03-29  8:09     ` Chris Murphy
2021-03-29  8:42       ` Aw: " B A
2021-03-29 13:36         ` Josef Bacik
2021-04-01 12:36           ` Aw: " B A
2021-03-29  7:36   ` Aw: " B A
2021-03-30  0:07 ` Chris Murphy
2021-03-30  8:44   ` Aw: " B A
2021-03-30 20:17     ` Chris Murphy
2021-04-01 12:42       ` Aw: " B A

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