The software described in this documentation is either in Extended Support or Sustaining Support. See for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.

2.2.6 btrfs: Unable to replay log after snapshot delete and parent directory fsync

If a snapshot is deleted and the parent directory is fsynced the log cannot be replayed during the next mount operation, preventing the file system from mounting. This is solvable by wiping the log trees using the btrfs-zero-log tool but is very inconvenient as it results in the loss of any data and metadata fsynced before the parent directory was fsynced. (Bug ID 24424719)