[Bug 1654057] [NEW] btrfs balance crashed

[MichaelE]

Public bug reported:

Converted a lvm partition from ext4 to btrfs, then deleted ext subvolume and started btrfs balance. Balance job crashed after some time leaving the partion in ro status.
btrfs check on unmounted partition did not work.
Could remount with -o recovery which also started balance job again.

Can somebody tell me what caused the crash and whether any data got
lost?

I'll attach the part of the kern.log as well.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: btrfs-tools 4.4-1
ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
Uname: Linux 4.4.0-53-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
Date: Wed Jan  4 20:40:30 2017
ProcEnviron:
 LANGUAGE=de_DE
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: btrfs-tools
UpgradeStatus: Upgraded to xenial on 2014-07-29 (890 days ago)

** Affects: btrfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1654057

Title:
  btrfs balance crashed

Status in btrfs-tools package in Ubuntu:
  New

Bug description:
  Converted a lvm partition from ext4 to btrfs, then deleted ext subvolume and started btrfs balance. Balance job crashed after some time leaving the partion in ro status.
  btrfs check on unmounted partition did not work.
  Could remount with -o recovery which also started balance job again.

  Can somebody tell me what caused the crash and whether any data got
  lost?

  I'll attach the part of the kern.log as well.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: btrfs-tools 4.4-1
  ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
  Uname: Linux 4.4.0-53-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.4
  Architecture: amd64
  Date: Wed Jan  4 20:40:30 2017
  ProcEnviron:
   LANGUAGE=de_DE
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: btrfs-tools
  UpgradeStatus: Upgraded to xenial on 2014-07-29 (890 days ago)

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