Hi again, so, it seems that I've solved the problem: After having to umount/mount the FS several times to get btrfs-cleaner to finish, I thought of the "failed to load free space [...], rebuilding it now" type errors and decided to try the clear_cache mount option. Since then, my home server has been running its backups regularly again. Furthermore, I was able back up my desktop again via send/recv (the rsync based backup is still running, but I expect it to succeed). The kernel log has also stayed clean. Kai, I'd be curious whether clear_cache will help in your case, too, if you haven't tried it already. Greetings -- Marc Joliet -- "People who think they know everything really annoy those of us who know we don't" - Bjarne Stroustrup
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