The underlying md-raid (mirroring) is fine. So according to md-raid
status, there's nothing wrong with the mirrored partitions:
cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4]
[raid10]
md0 : active raid1 sda3[0] sdb3[1]
2929833792 blocks super 1.2 [2/2] [UU]
Basically that means, if there is no issue with LUKS (and I don't see
any), then the btrfs-balance on a full disk led to the ro-mounted,
presumably corrupted file system.
I'll try to check the raid integrity, which might take a day or two.
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https://bugs.launchpad.net/bugs/1559723
Title:
soft lockup during btrfs balance
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