Public bug reported:

It seems I discovered another "Inappropriate ioctl for device" bug when
running an amd64 kernel on an i386 system (the first one was bug
1619918).  My system is trusty, but I assume later versions and even
upstream are affected.

Steps to reproduce:
- run an amd64 kernel via multi-arch on an i386 system
- Try to "btrfs send" or "btrfs receive" a subvolume

Result:
$ sudo btrfs send /mnt/LTS/snapshots/home-daily-2017-03-16/ -f 
/tmp/home-daily-2017-03-16.btrfs 
At subvol /mnt/LTS/snapshots/home-daily-2017-03-16/
ERROR: send ioctl failed with -25: Inappropriate ioctl for device

This occurs with 3.13.0-96-generic as well as 3.13.0-114-generic (which
fixes bug 1619918).

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1678645

Title:
  "btrfs send" returns "Inappropriate ioctl for device"

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