Public bug reported:
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)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: apport-bug s390x xenial
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https://bugs.launchpad.net/bugs/1565029
Title:
bcache doesn't register/recognize devices on s390x
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