Comment # 10 on bug 1063638 from Aaron Williams

After rebuilding the extent and csum trees I was able to boot again and things
went great until it started rebalancing. Then my system basically hung. I
couldn't even start a root or sudo session to stop the rebalancing. I was
forced to hit the power button  again after letting it run for several hours. I
booted a rescue flash drive to do it there so at least I can see what the hell
is going on. Fortunately after a couple of minute delay I was able to mount
read/write this time. There should be no need to do this since there is plenty
of space left.

OpenSUSE should not use BTRFS for anything critical like the root filesystem or
user data without strong warnings.