Btrfs devel - Oct 2014 - Empty directory can't be removed, "not empty"

Hello,

After an improper shutdown (power loss), I got one of these again:

# ls -la junk/
total 0
drwx------ 1 rm   rm   4152 Oct  5 18:44 .
drwxr-xr-x 1 root root   72 Oct  5 19:10 ..

# rm -rvf junk/
rm: cannot remove `junk': Directory not empty

The kernel version is 3.4.18.
If this helps, initially it was a Chromium browser profile directory; and it
had nodatacow files in it (chattr +C).
How to actually remove this directory now?

-- 
With respect,
Roman