[Bug 1931790] Re: Unable to mount btrfs RAID 1 filesystem after reboot - Error - device total_bytes should be at most X but found Y

[Ravindran K]

Hi Lukasz,

Unfortunately I could not find much alternatives/solutions in multiple
forums..

The best and easy workaround (if you are prepared to wait infinely: as noone responds to these one off issues) would be to install the mainline tool and install a older version of kernel:
https://ubuntuhandbook.org/index.php/2020/08/mainline-install-latest-kernel-ubuntu-linux-mint/ 

This will most likely work as it has worked for multiple people..Make
sure you choose old version of kernel like 5.4 (that worked for me).
Useful Tip:Try booting using Ubuntu Mint USB to see if you btrfs volume
readily mounts.

The other alternatuve solution which I discovered the hardway is to
break one of the disks (In my case, I rebuilt both disks one after the
other due to some issues) and re-add it and rebuild to see if that
solves..

The other best solution would be to delete both the raid devices and
create a new raid 1 volume from scratch while booted on the new kernel.
ofcourse this needs enough space and a backup which you can restore.

I reiterate, please backup if you data is valuable before you try
anything as inadvertently you might lose data while troubleshooting this
issue... All the best ..keep us posted :)

Regards
Ravindran

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https://bugs.launchpad.net/bugs/1931790

Title:
  Unable to mount btrfs RAID 1 filesystem after reboot - Error - device
  total_bytes should be at most X but found Y

Status in Ubuntu:
  New
Status in btrfs package in Ubuntu:
  New
Status in btrfs-progs package in Ubuntu:
  New

Bug description:
  Hi,

  I'm unable to mount my newly created btrfs RAID 1 filesystem after
  reboot..I performed the below steps with my 2 X 1 TB drives:

  * created a new btrfs filesystem
  mkfs.btrfs /dev/sdd1

  * mounted it to /mnt/datanew
  mount -t btrfs /dev/sdd1 /mnt/datanew

  * copied over data from my previous NTFS volume on /dev/sde1 (which I
  intended to add later as a mirror) - took 3.5 hrs

  * added a new volume
  mkfs.btrfs device add /dev/sde1

  * started balance and convert to raid 1 - took 8 to 10
  hours..overnight

  btrfs balance start -dconvert=raid1 -mconvert=raid1 /mnt/datanew

  * rebooted next morning

  I seeing below errors:
  [  792.045980] BTRFS info (device sdd1): allowing degraded mounts
  [  792.045988] BTRFS info (device sdd1): disk space caching is enabled
  [  792.045990] BTRFS info (device sdd1): has skinny extents
  [  792.047498] BTRFS error (device sdd1): device total_bytes should be at most 1000201841152 but found 1000203804672
  [  792.049207] BTRFS error (device sdd1): failed to read chunk tree: -22
  [  792.051525] BTRFS error (device sdd1): open_ctree failed
  * Manual mount has below error additonally
  mount: /mnt/datanew: wrong fs type, bad option, bad superblock on /dev/sde1, missing codepage or helper program, or other error.

  * Verified the data seems intact (apparently no errors), superblock
  seems fine.. tried btrfs rescue commands.. no issues found to fix

  * Found several hits on search but not many solutions..except "btrfs filesystem resize max /" which doesnt work as I'm unable to mount in the first place..
  btrfs filesystem resize max /mnt/datanew/
  ERROR: not a btrfs filesystem: /mnt/datanew/

  Any suggestions? Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: ubuntu-release-upgrader-core 1:21.04.13
  ProcVersionSignature: Ubuntu 5.11.0-17.18-generic 5.11.12
  Uname: Linux 5.11.0-17-generic x86_64
  ApportVersion: 2.20.11-0ubuntu65.1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  Date: Sun Jun 13 11:17:02 2021
  InstallationDate: Installed on 2021-05-16 (27 days ago)
  InstallationMedia: Kubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_IN:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_IN
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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