Comment # 5 on bug 1193762 from Arvin Schnell

I was able to reproduce the problem even without snapshots, so in
a setup that should be supported. Here are the steps:

# pvcreate /dev/sdc1
# pvcreate /dev/sdd1
# vgcreate test /dev/sd[cd]1
# lvcreate --type raid1 -m 1 --size 2g --name foo test
# lvconvert --type thin-pool test/foo
# lvcreate --type thin test/foo --virtualsize 1G --name thin1
# mkfs.btrfs /dev/test/thin1
# btrfs filesystem show
    shows   path /dev/mapper/test-foo_tdata_rimage_0
# mount /dev/test/thin1 /mnt/
# btrfs filesystem show
    shows   path /dev/mapper/test-thin1

I tried with a different name that "foo" and it worked - maybe
due to btrfs selecting another of the devices?