Public bug reported:
Stopping and unregistering bcache caches and backing devices results in
losing the bcache superblock on devices rendering bcached devices
corrupt or broken.
1. Ubuntu 4.4.0-28.47-generic 4.4.13
2. attaching lspci log
3.
Description: Ubuntu 16.04 LTS
Release: 16.04
4. # apt-cache policy linux-image
linux-image:
Installed: (none)
Candidate: (none)
Version table:
root@rharper-vm1:~# apt-cache policy linux-image-generic
linux-image-generic:
Installed: (none)
Candidate: 4.4.0.28.30
Version table:
4.4.0.28.30 500
500 http://ports.ubuntu.com/ubuntu-ports xenial-updates/main ppc64el
Packages
500 http://ports.ubuntu.com/ubuntu-ports xenial-security/main ppc64el
Packages
4.4.0.21.22 500
500 http://ports.ubuntu.com/ubuntu-ports xenial/main ppc64el Packages
5. After creating bcache devices, upon reboot they continue to remain as bcache
devices for use
6. Sometimes after reboot either the cache device, or the backing device loses
the bcache-super-block rendering them useless to the bcache module (it fails to
detect them).
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-28-generic 4.4.0-28.47
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic ppc64le
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jul 11 21:30 seq
crw-rw---- 1 root audio 116, 33 Jul 11 21:30 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: ppc64el
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
Date: Tue Jul 12 14:20:24 2016
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
Bus 001 Device 003: ID 0627:0001 Adomax Technology Co., Ltd
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
PciMultimedia:
ProcEnviron:
TERM=screen
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 OFfb vga
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinux-4.4.0-28-generic
root=LABEL=cloudimg-rootfs earlyprintk
ProcLoadAvg: 6.28 4.78 4.12 1/133 4838
ProcLocks:
1: POSIX ADVISORY WRITE 1306 00:11:541 0 EOF
2: FLOCK ADVISORY WRITE 918 00:11:521 0 EOF
3: POSIX ADVISORY WRITE 875 00:11:507 0 EOF
4: POSIX ADVISORY WRITE 870 00:11:123 0 EOF
5: POSIX ADVISORY WRITE 682 00:11:358 0 EOF
ProcSwaps: Filename Type Size Used
Priority
ProcVersion: Linux version 4.4.0-28-generic (buildd@bos01-ppc64el-018) (gcc
version 5.3.1 20160413 (Ubuntu/IBM 5.3.1-14ubuntu2.1) ) #47-Ubuntu SMP Fri Jun
24 10:09:20 UTC 2016
RelatedPackageVersions:
linux-restricted-modules-4.4.0-28-generic N/A
linux-backports-modules-4.4.0-28-generic N/A
linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
cpu_cores: Number of cores present = 1
cpu_coreson: Number of cores online = 1
cpu_dscr: DSCR is 0
cpu_freq:
min: 3.684 GHz (cpu 0)
max: 3.684 GHz (cpu 0)
avg: 3.684 GHz
cpu_runmode: run-mode=0
cpu_smt: Error: command ['ppc64_cpu', '--smt'] failed with exit code 255:
Machine is not SMT capable
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug ppc64el uec-images xenial
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https://bugs.launchpad.net/bugs/1602299
Title:
bcache is unstable on ppc64el
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