Disk space leak on first rollback of btrfs filesystem

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Environment

SUSE Linux Enterprise Server 12

Situation

After the first rollback, disk space does not get freed up automatically as the original root filesystem is not accessible below /.snapshots but still occupies space.

Resolution

The disk space can be freed by following these steps:

Mount the initial root filesystem after a rollback with
mount /dev/<root> -o subvol=@ /mnt
Remove all files below /mnt that are not in a subvolume with
find /mnt -xdev -delete
Umount the filesystem again with
umount /mnt

Cause

Additional Information

The issue only occurs after the first rollback, later rollbacks will free up space automatically.

Disclaimer

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