Comment 0 for bug 1654057

Converted a lvm partition from ext4 to btrfs, then deleted ext subvolume and started btrfs balance. Balance job crahsed 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 cause 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)