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[Jürg Häfliger <1809886@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1809886

Title:
  f88ba6a2a44ee98e8d59654463dc157bb6d13c43 in ubuntu_btrfs_kernel_fixes
  failed on X/B/C/D

Status in ubuntu-kernel-tests:
  Fix Released

Bug description:
  This patch exists in the Xenial tree.

  
  Test failed with:
      failed: degraded mount should have failed, but didn't

  
  Invoking test f88ba6a2a44ee98e8d59654463dc157bb6d13c43

  fix f88ba6a2a44ee98e8d59654463dc157bb6d13c43

      Btrfs: skip submitting barrier for missing device

      I got an error on v3.13:
       BTRFS error (device sdf1) in write_all_supers:3378: errno=-5 IO failure (errors while submitting device barriers.)

      how to reproduce:
        > mkfs.btrfs -f -d raid1 /dev/sdf1 /dev/sdf2
        > wipefs -a /dev/sdf2
        > mount -o degraded /dev/sdf1 /mnt
        > btrfs balance start -f -sconvert=single -mconvert=single -dconvert=single /mnt

      The reason of the error is that barrier_all_devices() failed to submit
      barrier to the missing device.  However it is clear that we cannot do
      anything on missing device, and also it is not necessary to care chunks
      on the missing device.

      This patch stops sending/waiting barrier if device is missing.

  failed: degraded mount should have failed, but didn't

  FAIL: f88ba6a2a44ee98e8d59654463dc157bb6d13c43 (ret=1)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-164-generic 3.13.0-164.214
  ProcVersionSignature: User Name 3.13.0-164.214-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-164-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Dec 27 10:11 seq
   crw-rw---- 1 root audio 116, 33 Dec 27 10:11 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.29
  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:
  CurrentDmesg: [   29.063592] random: nonblocking pool is initialized
  Date: Thu Dec 27 10:11:58 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:
   
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-164-generic root=UUID=2a4b0342-a2dd-4feb-b3e2-9644ca1c4a60 ro console=ttyS0,115200n8
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-164-generic N/A
   linux-backports-modules-3.13.0-164-generic  N/A
   linux-firmware                              1.127.24
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 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.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-xenial
  dmi.sys.vendor: QEMU

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