There was a similar discussion about an error in January 2013 but it related to some kernel panic. I don't know if I encountered the same thing. These errors from system journal bother me: 2月 09 22:18:53 melforce kernel: BTRFS error (device sdb3): Error removing orphan entry, stopping orphan cleanup 2月 09 22:18:53 melforce kernel: BTRFS critical (device sdb3): could not do orphan cleanup -22 I run kernel 3.12.10. I'll explain what I did at that moment. Subvolumes were already mounted at /home and /var and I mounted the root subvolume at /mnt/btr2. Then executed ls command on /home/btr2. ls gave me "invalid argument" errors, but still displayed the contents. Next time I ran ls (right away), there were no more errors. Another example is a script that mounts the same thing and then takes snapshots. If I run the script manually, it never fails. If I run it from cron job, one of the snapshot commands fails telling me that /home/btr2/var isn't accesible (I don't remember the exact error message, I can look if it shows up again). Someone said in the January thread that -22 error messages are harmless but in this case userspace tools break so I wouldn't consider this totally harmless. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html