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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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  5fbc7c59fd22c5a6531b40b0759624b680a95e52 in btrfs_kernel_fixes failed
  on B

Status in linux package in Ubuntu:

Bug description:
  Test failed with mount operation:
      mount: /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52: wrong fs type, 
bad option, bad superblock on /dev/loop0, missing codepage or helper program, 
or other error.

  This patch could be found in Bionic tree:

  Invoking test 5fbc7c59fd22c5a6531b40b0759624b680a95e52

  fix 5fbc7c59fd22c5a6531b40b0759624b680a95e52

      Btrfs: fix unfinished readahead thread for raid5/6 degraded

      Steps to reproduce:

       # mkfs.btrfs -f /dev/sd[b-f] -m raid5 -d raid5
       # mkfs.ext4 /dev/sdc --->corrupt one of btrfs device
       # mount /dev/sdb /mnt -o degraded
       # btrfs scrub start -BRd /mnt

      This is because readahead would skip missing device, this is not true
      for RAID5/6, because REQ_GET_READ_MIRRORS return 1 for RAID5/6 block
      mapping. If expected data locates in missing device, readahead thread
      would not call __readahead_hook() which makes event @rc->elems=0
      wait forever.

      Fix this problem by checking return value of btrfs_map_block(),we
      can only skip missing device safely if there are several mirrors.

  mke2fs 1.44.1 (24-Mar-2018)
  Discarding device blocks:   4096/524288*************             
  Creating filesystem with 524288 4k blocks and 131072 inodes
  Filesystem UUID: c4b9a22f-cacb-44d6-80b9-cca217a61f5b
  Superblock backups stored on blocks: 
        32768, 98304, 163840, 229376, 294912

  Allocating group tables:  0/16*****     *****done                            
  Writing inode tables:  0/16*****     *****done                            
  Creating journal (16384 blocks): done
  Writing superblocks and filesystem accounting information:  0/16*****     

  mount: /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52: wrong fs type, bad 
option, bad superblock on /dev/loop0, missing codepage or helper program, or 
other error.
  ERROR: not a btrfs filesystem: 
  btrfs scrub start on /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52 failed
  umount: /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52: not mounted.

  FAIL: 5fbc7c59fd22c5a6531b40b0759624b680a95e52 (ret=1)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-43-generic 4.15.0-43.46
  ProcVersionSignature: User Name 4.15.0-43.46-generic 4.15.18
  Uname: Linux 4.15.0-43-generic x86_64
   total 0
   crw-rw---- 1 root audio 116,  1 Dec 31 02:11 seq
   crw-rw---- 1 root audio 116, 33 Dec 31 02:11 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  Date: Thu Jan  3 07:37:01 2019
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic 
root=UUID=2f68c627-8ab4-40d5-8c06-6563436d0f96 ro console=ttyS0,115200n8
   linux-restricted-modules-4.15.0-43-generic N/A
   linux-backports-modules-4.15.0-43-generic  N/A
   linux-firmware                             1.173.2
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install) 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-xenial
dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-xenial
  dmi.sys.vendor: QEMU

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