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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1565029

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1565029

Title:
  bcache doesn't register/recognize devices on s390x

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  
  1. #  cat /proc/version_signature
  Ubuntu 4.4.0-16.32-generic 4.4.6

  # no pci on s390x, but none-the-less
  2. root@ubuntu:~# sudo lspci -vnvn
  root@ubuntu:~#

  # lsb_release -rd
  Description:	Ubuntu Xenial Xerus (development branch)
  Release:	16.04

  # apt-cache policy linux-image-generic
  linux-image-generic:
    Installed: 4.4.0.16.17
    Candidate: 4.4.0.16.17
    Version table:
   *** 4.4.0.16.17 500
          500 http://us.ports.ubuntu.com/ubuntu-ports xenial/main s390x Packages
          100 /var/lib/dpkg/status

  3. bcache cache and backing devices auto register when created (or can
  be registered manually vi /sys/fs/bcache/register

  4. what currently happens:

  - modprobe bcache
  - create a cache device and a backing device

  # make-bcache -C /dev/vda1
  # make-bcache -B /dev/vda2

  on amd64, the cache device is automatically registered, on s390x,
  there is a kernel error

  [ 4127.805719] bcache: register_bcache() error opening /dev/vda1: Not
  a bcache superblock

  But bcache-show-super says it's fine:

  # bcache-super-show /dev/vda1
  sb.magic		ok
  sb.first_sector		8 [match]
  sb.csum			70C54F690E440FF5 [match]
  sb.version		1 [backing device]

  dev.label		(empty)
  dev.uuid		83e7fe43-66d9-4cf1-8050-8469e86ffff9
  dev.sectors_per_block	8
  dev.sectors_per_bucket	1024
  dev.data.first_sector	16
  dev.data.cache_mode	0 [writethrough]
  dev.data.cache_state	0 [detached]

  cset.uuid               72f737d7-0dc6-491a-929c-37a4b3e8d058

  echo "/dev/vda1" | sudo tee /sys/fs/bcache/register  fails as well,
  with:

  bash: echo: write error: Invalid argument

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-generic 4.4.0.16.17
  ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
  Uname: Linux 4.4.0-2-generic s390x
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20-0ubuntu3
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Date: Fri Apr  1 11:52:00 2016
  IwConfig:
   lo        no wireless extensions.
   
   docker0   no wireless extensions.
   
   eth0      no wireless extensions.
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C
   SHELL=/bin/bash
  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=2a60026a-b696-4b21-88df-e7fc236f4472
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-2-generic N/A
   linux-backports-modules-4.4.0-2-generic  N/A
   linux-firmware                           1.157
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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