f88ba6a2a44ee98e8d59654463dc157bb6d13c43 in ubuntu_btrfs_kernel_fixes failed on D i386

Test failed with:
  btrfs balance failed on /tmp/mnt-f88ba6a2a44ee98e8d59654463dc157bb6d13c43

Test log:
  * Command:
      BINDIR=/home/ubuntu/autotest/client/tests/ubuntu_btrfs_kernel_fixes /home
      /ubuntu/autotest/client/tests/ubuntu_btrfs_kernel_fixes/ubuntu_btrfs_kerne
      l_fixes.sh /home/ubuntu/autotest/client/tests/ubuntu_btrfs_kernel_fixes/fi
      xes/f88ba6a2a44ee98e8d59654463dc157bb6d13c43.sh 2>&1
  Exit status: 1
  Duration: 11.0287649632

  stdout:
  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.

  btrfs balance failed on /tmp/mnt-f88ba6a2a44ee98e8d59654463dc157bb6d13c43

  FAIL: f88ba6a2a44ee98e8d59654463dc157bb6d13c43 (ret=1)

Syslog:
kernel: [ 1531.598180] Invoking test f88ba6a2a44ee98e8d59654463dc157bb6d13c43
kernel: [ 1531.822544] BTRFS: device fsid 28683721-4c7a-4922-a753-e61ca95c0726 devid 1 transid 5 /dev/loop2
kernel: [ 1531.917840] BTRFS: device fsid 28683721-4c7a-4922-a753-e61ca95c0726 devid 2 transid 5 /dev/loop3
kernel: [ 1532.314274] BTRFS info (device loop2): allowing degraded mounts
kernel: [ 1532.314276] BTRFS info (device loop2): disk space caching is enabled
kernel: [ 1532.314277] BTRFS info (device loop2): has skinny extents
kernel: [ 1532.314278] BTRFS info (device loop2): flagging fs with big metadata feature
kernel: [ 1532.315442] BTRFS warning (device loop2): devid 2 uuid b6fe3a66-6a6d-42fe-9b57-5373a2f8d014 is missing
kernel: [ 1532.315882] BTRFS info (device loop2): checking UUID tree
kernel: [ 1532.319154] BTRFS error (device loop2): balance: invalid convert data profile single
systemd[965]: tmp-mnt\x2df88ba6a2a44ee98e8d59654463dc157bb6d13c43.mount: Succeeded.
systemd[1]: tmp-mnt\x2df88ba6a2a44ee98e8d59654463dc157bb6d13c43.mount: Succeeded.
kernel: [ 1532.524774] Test f88ba6a2a44ee98e8d59654463dc157bb6d13c43 returned 0

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: linux-image-5.0.0-13-generic 5.0.0-13.14
ProcVersionSignature: User Name 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic i686
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 May 9 09:31 seq
 crw-rw---- 1 root audio 116, 33 May 9 09:31 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.10-0ubuntu27
Architecture: i386
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDmesg:

Date: Thu May 9 09:33:18 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb:
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. PowerEdge R310
PciMultimedia:

ProcFB: 0 mgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-13-generic root=UUID=7b91a2b8-2e02-407e-a51d-766f6d969020 ro
RelatedPackageVersions:
 linux-restricted-modules-5.0.0-13-generic N/A
 linux-backports-modules-5.0.0-13-generic N/A
 linux-firmware 1.178
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/17/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.8.2
dmi.board.name: 05XKKK
dmi.board.vendor: Dell Inc.
dmi.board.version: A05
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.8.2:bd08/17/2011:svnDellInc.:pnPowerEdgeR310:pvr:rvnDellInc.:rn05XKKK:rvrA05:cvnDellInc.:ct23:cvr:
dmi.product.name: PowerEdge R310
dmi.sys.vendor: Dell Inc.