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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Tags added: bot-stop-nagging

** Tags added: kernel-da-key

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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

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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:
  Triaged

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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