On Sat, Feb 13, 2021 at 3:09 PM Cerem Cem ASLAN <cerem...@ceremcem.net> wrote: > > Basically I'm using btrbk to create snapshots on main disk (MMM) and > send them 2 distinct disks (AAA and BBB). I have many nested > subvolumes (X, X/foo/Y, etc), so every distinct subvolume is > enumerated separately, like X.111, X.112, ..., X/foo/Y.111, > X/foo/Y.112, etc. Setup worked well for 100s of snapshots and backups > (send/receive) within the last 2 months. > > Currently there is one offending subvolume that couldn't be sent to > disk AAA (say X.111). I tried to send it a couple of times even though > the huge size (230GB, takes 4 hour for every test) but there was no > success. > > Error was like: > > ERROR: ... sh: btrfs send -p > /mnt/MMM-root/snapshots/erik3/rootfs.20210213T0356 -c > /mnt/MMM-root/snapshots/erik3/rootfs.20210213T0414 > /mnt/MMM-root/snapshots/erik3/home/ceremcem.20210213T0356 | mbuffer -v > 1 | btrfs receive /mnt/AAA-root/snapshots/erik3/home/ > ERROR: ... cannot open > /mnt/AAA-root/snapshots/erik3/home/ceremcem.20210213T0356/o10179316-137012-0: > No such file or directory > > I tried to issue `btrfs send > /mnt/MMM-root/snapshots/erik3/home/ceremcem.20210213T0356 | pv > > /dev/null` to see if there is anything wrong with the source snapshot, > but it succeeded. > > Skipping the other intermediate attempts, I tried to remove every > snapshot in AAA, BBB, reformat AAA and BBB with mkfs.btrfs, deleted > all snapshots and created a new set on MMM, tried to send everything > from scratch. It failed with nearly the same error (can't remember > now) on the same subvolume > (/mnt/MMM-root/snapshots/erik3/home/ceremcem.XXX). > > I ran a btrfs scrub on /mnt/MMM-root and there were no errors. > > Why do I keep getting this error? > > uname -a > Linux erik3 5.9.0-0.bpo.5-amd64 #1 SMP Debian 5.9.15-1~bpo10+1
Assuming this is a 5.9.0 vanilla kernel, or something close enough, then you are missing some bug fixes that are likely to solve this: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0b3f407e6728d990ae1630a02c7b952c21c288d3 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9c2b4e0347067396ceb3ae929d6888c81d610259 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=98272bb77bf4cc20ed1ffca89832d713e70ebf09 These are all in recent stable kernels (the versions listed in kernel.org). > (2020-12-31) x86_64 GNU/Linux > > btrfs-progs v5.10 -- Filipe David Manana, “Whether you think you can, or you think you can't — you're right.”
