OK I see from dmesg that this is kernel 4.14.3, and I've used that
quite a bit without problems so I don't think it's related.

What do you get for

$ sudo btrfs dev stats /dev/

If you haven't done a scrub since this problem happened it's worth
seeing if that shows any problems:

$ sudo btrfs scrub start /
$ sudo btrfs scrub status /

IF there are errors, you can extract those and post them with

$ dmesg | grep -i btrfs

I'll keep looking for this ???? filename business.

Chris Murphy
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