Uh I pasted the commits in reverse order, but you get the idea...
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https://bugs.launchpad.net/bugs/1682456
Title:
md devices may leave remnants in /sys/class/block after removal
Status in linux package in Ubuntu:
Confirmed
Bug description:
1. root@x1:~# cat /proc/version_signature
Ubuntu 4.4.0-72.93-generic 4.4.49
2. attached
3. # lsb_release -rd
Description: Ubuntu 16.04.2 LTS
Release: 16.04
4. # apt-cache policy linux-image-`uname -r`
linux-image-4.4.0-72-generic:
Installed: 4.4.0-72.93
Candidate: 4.4.0-72.93
Version table:
*** 4.4.0-72.93 500
500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64
Packages
100 /var/lib/dpkg/status
5. After stopping an md device, the sysfs and /dev entry should be
removed:
mdadm --stop /dev/md0 && [ "`test -e /sys/class/block/md0`" = "1" ]; echo $rc
should return 0;
6. /dev/md0 is gone, but /sys/class/block/md0 remains
I believe this is related to this thread here:
https://www.spinics.net/lists/raid/msg54859.html
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-72-generic 4.4.0-72.93
ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
Uname: Linux 4.4.0-72-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Apr 12 21:55 seq
crw-rw---- 1 root audio 116, 33 Apr 12 21:55 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
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: Thu Apr 13 14:32:17 2017
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
PciMultimedia:
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-72-generic
root=UUID=4c974bc3-8fe8-41b5-a563-23b2dcf974c9 ro console=tty1 console=ttyS0
RelatedPackageVersions:
linux-restricted-modules-4.4.0-72-generic N/A
linux-backports-modules-4.4.0-72-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)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: Ubuntu-1.8.2-1ubuntu2
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-yakkety
dmi.modalias:
dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu2:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-yakkety:cvnQEMU:ct1:cvrpc-i440fx-yakkety:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-yakkety
dmi.sys.vendor: QEMU
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