btrfs/182 from ubuntu_xfstests_btrfs failed on B/D/F

Issue found on node amd64 node "kili"

 btrfs/182 - output mismatch (see /home/ubuntu/autotest/client/tmp/ubuntu_xfstests_btrfs/src/xfstests-bld/xfstests-dev/results//btrfs/182.out.bad)
     --- tests/btrfs/182.out 2019-10-16 10:51:13.104701643 +0000
     +++ /home/ubuntu/autotest/client/tmp/ubuntu_xfstests_btrfs/src/xfstests-bld/xfstests-dev/results//btrfs/182.out.bad 2019-10-16 11:12:32.817591531 +0000
     @@ -1,2 +1,4 @@
      QA output created by 182
     +ERROR: error during balancing '/home/ubuntu/autotest/client/tmp/tmp/xfstests-scratch': No space left on device
     +There may be more info in syslog - try dmesg | tail
      Silence is golden
     ...
     (Run 'diff -u /home/ubuntu/autotest/client/tmp/ubuntu_xfstests_btrfs/src/xfstests-bld/xfstests-dev/tests/btrfs/182.out /home/ubuntu/autotest/client/tmp/ubuntu_xfstests_btrfs/src/xfstests-bld/xfstests-dev/results//btrfs/182.out.bad' to see the entire diff)

$ diff -u /home/ubuntu/autotest/client/tmp/ubuntu_xfstests_btrfs/src/xfstests-bld/xfstests-dev/tests/btrfs/182.out /home/ubuntu/autotest/client/tmp/ubuntu_xfstests_btrfs/src/xfstests-bld/xfstests-dev/results//btrfs/182.out.bad
--- /home/ubuntu/autotest/client/tmp/ubuntu_xfstests_btrfs/src/xfstests-bld/xfstests-dev/tests/btrfs/182.out 2019-10-16 10:51:13.104701643 +0000
+++ /home/ubuntu/autotest/client/tmp/ubuntu_xfstests_btrfs/src/xfstests-bld/xfstests-dev/results//btrfs/182.out.bad 2019-10-16 11:12:32.817591531 +0000
@@ -1,2 +1,4 @@
 QA output created by 182
+ERROR: error during balancing '/home/ubuntu/autotest/client/tmp/tmp/xfstests-scratch': No space left on device
+There may be more info in syslog - try dmesg | tail
 Silence is golden

Syslog:
Oct 16 11:12:28 kili ubuntu: run xfstest btrfs/182
Oct 16 11:12:28 kili kernel: [ 1887.982615] run fstests btrfs/182 at 2019-10-16 11:12:28
Oct 16 11:12:28 kili kernel: [ 1888.168789] BTRFS info (device sdb1): disk space caching is enabled
Oct 16 11:12:28 kili kernel: [ 1888.168791] BTRFS info (device sdb1): has skinny extents
Oct 16 11:12:28 kili kernel: [ 1888.171922] BTRFS info (device sdb1): enabling ssd optimizations
Oct 16 11:12:28 kili kernel: [ 1888.254332] BTRFS: device fsid 31ebd16f-0464-4373-b2d9-d3beef4d1bf4 devid 1 transid 5 /dev/sdb2
Oct 16 11:12:28 kili kernel: [ 1888.274317] BTRFS info (device sdb2): disk space caching is enabled
Oct 16 11:12:28 kili kernel: [ 1888.274319] BTRFS info (device sdb2): has skinny extents
Oct 16 11:12:28 kili kernel: [ 1888.274320] BTRFS info (device sdb2): flagging fs with big metadata feature
Oct 16 11:12:28 kili kernel: [ 1888.282340] BTRFS info (device sdb2): enabling ssd optimizations
Oct 16 11:12:28 kili kernel: [ 1888.286045] BTRFS info (device sdb2): checking UUID tree
Oct 16 11:12:32 kili kernel: [ 1892.268108] BTRFS info (device sdb2): balance: start -m -s
Oct 16 11:12:32 kili kernel: [ 1892.268284] BTRFS info (device sdb2): relocating block group 1048576 flags system
Oct 16 11:12:32 kili kernel: [ 1892.272632] BTRFS info (device sdb2): found 1 extents
Oct 16 11:12:32 kili kernel: [ 1892.275676] BTRFS info (device sdb2): 2 enospc errors during balance
Oct 16 11:12:32 kili kernel: [ 1892.275678] BTRFS info (device sdb2): balance: ended with status: -28
Oct 16 11:12:32 kili systemd[1894]: home-ubuntu-autotest-client-tmp-tmp-xfstests\x2dtest.mount: Succeeded.
Oct 16 11:12:32 kili systemd[1]: home-ubuntu-autotest-client-tmp-tmp-xfstests\x2dtest.mount: Succeeded.
Oct 16 11:12:32 kili systemd[1]: home-ubuntu-autotest-client-tmp-tmp-xfstests\x2dscratch.mount: Succeeded.
Oct 16 11:12:32 kili systemd[1894]: home-ubuntu-autotest-client-tmp-tmp-xfstests\x2dscratch.mount: Succeeded.
Oct 16 11:12:32 kili kernel: [ 1892.433637] BTRFS info (device sdb2): disk space caching is enabled
Oct 16 11:12:32 kili kernel: [ 1892.433639] BTRFS info (device sdb2): has skinny extents
Oct 16 11:12:32 kili kernel: [ 1892.437048] BTRFS info (device sdb2): enabling ssd optimizations
Oct 16 11:12:32 kili systemd[1894]: home-ubuntu-autotest-client-tmp-tmp-xfstests\x2dscratch.mount: Succeeded.
Oct 16 11:12:32 kili systemd[1]: home-ubuntu-autotest-client-tmp-tmp-xfstests\x2dscratch.mount: Succeeded.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: linux-image-5.0.0-31-generic 5.0.0-31.33
ProcVersionSignature: User Name 5.0.0-31.33-generic 5.0.21
Uname: Linux 5.0.0-31-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Oct 16 10:41 seq
 crw-rw---- 1 root audio 116, 33 Oct 16 10:41 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
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:
Date: Thu Oct 17 04:26:10 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
MachineType: Intel Corporation S2600WTT
PciMultimedia:

ProcFB: 0 mgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-31-generic root=UUID=72dbdd83-0e2a-4fdd-99ca-70869e30b925 ro
RelatedPackageVersions:
 linux-restricted-modules-5.0.0-31-generic N/A
 linux-backports-modules-5.0.0-31-generic N/A
 linux-firmware 1.178.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/19/2015
dmi.bios.vendor: Intel Corporation
dmi.bios.version: SE5C610.86B.01.01.1008.031920151331
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: S2600WTT
dmi.board.vendor: Intel Corporation
dmi.board.version: G92187-350
dmi.chassis.asset.tag: ....................
dmi.chassis.type: 23
dmi.chassis.vendor: ...............................
dmi.chassis.version: ..................
dmi.modalias: dmi:bvnIntelCorporation:bvrSE5C610.86B.01.01.1008.031920151331:bd03/19/2015:svnIntelCorporation:pnS2600WTT:pvr....................:rvnIntelCorporation:rnS2600WTT:rvrG92187-350:cvn...............................:ct23:cvr..................:
dmi.product.family: Family
dmi.product.name: S2600WTT
dmi.product.sku: SKU Number
dmi.product.version: ....................
dmi.sys.vendor: Intel Corporation