On 05/07/2019 04.39, Vladimir Panteleev wrote:
The process reached a point where the last missing device shows as containing 20 GB of RAID1 metadata. At this point, attempting to delete the device causes the operation to shortly fail with "No space left", followed by a "kernel BUG at fs/btrfs/relocation.c:2499!", and the "btrfs device delete" command to crash with a segmentation fault.
Same effect if I try to use btrfs-replace on the missing device (which works) and then try to delete it (which fails in the same way).
Also same effect if I try to balance the metadata (balance start -v -m /mnt/a).
At this point this doesn't look like it is at all related to RAID10 or btrfs_check_rw_degradable, just a bug somewhere with handling something weird in the filesystem.
I'm out of ideas, so suggestions welcome. :) -- Best regards, Vladimir
