Not sure if this was supposed to also be fixed in bionic-proposed yet,
but I assumed so and
it's not working there; I'll test -proposed in artful and xenial next.
ubuntu@ubuntu:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu Bionic Beaver (development branch)"
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 4.15.0-13-generic #14-Ubuntu SMP Sat Mar 17 13:44:27 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@ubuntu:~$ apt-cache policy linux-image-virtual
linux-image-virtual:
Installed: 4.15.0.13.14
Candidate: 4.15.0.13.14
Version table:
*** 4.15.0.13.14 500
500 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages
100 /var/lib/dpkg/status
4.15.0.12.13 500
500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 4.15.0-13-generic #14-Ubuntu SMP Sat Mar 17 13:44:27 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@ubuntu:~$ ls -al /dev/bcache*
brw-rw---- 1 root disk 251, 0 Mar 19 18:09 /dev/bcache0
brw-rw---- 1 root disk 251, 128 Mar 19 18:09 /dev/bcache1
brw-rw---- 1 root disk 251, 256 Mar 19 18:09 /dev/bcache2
brw-rw---- 1 root disk 251, 384 Mar 19 18:09 /dev/bcache3
ubuntu@ubuntu:~$ dmesg | grep bcache
[ 1.005037] bcache: register_bdev() registered backing device sdb
[ 1.011078] bcache: bch_journal_replay() journal replay done, 0
keys in 1 entries, seq 5
[ 1.023834] bcache: bch_cached_dev_attach() Caching sdb as bcache0
on set 0dbdcc17-7af0-4318-bd57-bbdf5c7f1bfa
[ 1.029237] bcache: register_cache() registered cache device sda
[ 1.029555] bcache: register_bdev() registered backing device sdd
[ 1.050543] bcache: bch_cached_dev_attach() Caching sdd as bcache1
on set 0dbdcc17-7af0-4318-bd57-bbdf5c7f1bfa
[ 1.052124] bcache: register_bdev() registered backing device sde
[ 1.054044] bcache: register_bdev() registered backing device sdf
[ 1.058398] bcache: bch_journal_replay() journal replay done, 0
keys in 1 entries, seq 5
[ 1.068618] bcache: bch_cached_dev_attach() Caching sdf as bcache3
on set d36b419d-a49d-42e2-95af-710138a20700
[ 1.070652] bcache: bch_cached_dev_attach() Caching sde as bcache2
on set d36b419d-a49d-42e2-95af-710138a20700
[ 1.076326] bcache: register_cache() registered cache device sdc
[ 4.090280] bcache: register_bcache() error /dev/sdc: device
already registered
[ 4.091070] bcache: register_bcache() error /dev/sdd: device
already registered
[ 4.094397] bcache: register_bcache() error /dev/sde: device
already registered
[ 4.095253] bcache: register_bcache() error /dev/sda: device
already registered
[ 4.103178] bcache: register_bcache() error /dev/sdb: device
already registered
[ 4.115378] bcache: register_bcache() error /dev/sdf: device
already registered
On Mon, Mar 19, 2018 at 5:56 AM, Stefan Bader
<stefan.ba...@canonical.com> wrote:
> This bug is awaiting verification that the kernel in -proposed solves
> the problem. Please test the kernel and update this bug with the
> results. If the problem is solved, change the tag 'verification-needed-
> artful' to 'verification-done-artful'. If the problem still exists,
> change the tag 'verification-needed-artful' to 'verification-failed-
> artful'.
>
> If verification is not done by 5 working days from today, this fix will
> be dropped from the source code, and this bug will be closed.
>
> See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
> to enable and use -proposed. Thank you!
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729145
>
> Title:
> /dev/bcache/by-uuid links not created after reboot
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1729145/+subscriptions
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1729145
Title:
/dev/bcache/by-uuid links not created after reboot
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
Fix Committed
Status in linux source package in Zesty:
Won't Fix
Status in linux source package in Artful:
Fix Committed
Status in linux source package in Bionic:
In Progress
Bug description:
1. $ lsb_release -rd
Description: Ubuntu 17.10
Release: 17.10
2. $ apt-cache policy linux-image-`uname -r`
linux-image-4.13.0-16-generic:
Installed: 4.13.0-16.19
Candidate: 4.13.0-16.19
Version table:
*** 4.13.0-16.19 500
500 http://nova.clouds.archive.ubuntu.com/ubuntu artful/main amd64
Packages
100 /var/lib/dpkg/status
3. After creating some bcache devices and rebooting
/dev/bcache/by-uuid/<UUID> -> ../../bcacheN
symlinks point to the current bcache device which is caching the dev.uuid
found after creating a backing device.
4. /dev/bcache/by-uuid does not exist and there are not symlinks
underneath
It appears that since the initramfs loads the bcache module which
probes and finds all of the cache devices and backing devices then
once the rootfs is mounted and udev gets to run, the bcache kernel
module does not emit the CACHED_UUID value into the environment if the
underlying devices are already registered.
In dmesg, one can see that prior to mounting the rootfs, we see bcache
register events:
[ 5.333973] bcache: register_bdev() registered backing device vdb2
[ 5.354138] bcache: register_bdev() registered backing device vdb4
[ 5.365665] bcache: register_bdev() registered backing device vdb3
[ 5.397720] bcache: bch_journal_replay() journal replay done, 0 keys in 1
entries, seq 1
[ 5.428683] bcache: register_cache() registered cache device vdb1
then rootfs ismounted and systemd starts systemd-udev
[ 9.350889] systemd[1]: Listening on udev Kernel Socket.
And then the coldplug replay of kernel events triggers
/lib/udev/rules.d/69-bcache.rules
which invokes /lib/udev/bcache-register which writes the device name
(/dev/vdb1 or /dev/bcache0) into /sys/fs/bcache/register and results is the
bcache kernel driver attempting to register the block device. However, there
is already a bcache device associated already and registration fails
[ 11.173141] bcache: register_bcache() error opening /dev/vdb2: device
already registered
[ 11.184617] bcache: register_bcache() error opening /dev/vdb3: device
already registered
[ 11.199130] bcache: register_bcache() error opening /dev/vdb1: device
already registered
[ 11.271694] bcache: register_bcache() error opening /dev/vdb4: device
already registered
The problem then is that only a kernel call to bch_cached_dev_run()
which happens like this:
bcache_register()
register_bdev()
bch_cached_dev_run()
kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);
where env includes:
"DRIVER=bcache",
kasprintf(GFP_KERNEL, "CACHED_UUID=%pU", dc->sb.uuid),
NULL,
NULL,
};
Since that event is not emitted for any previously registered device,
then the symlink will not be created.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-16-generic 4.13.0-16.19
ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Oct 31 22:09 seq
crw-rw---- 1 root audio 116, 33 Oct 31 22:09 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord':
'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
Date: Wed Nov 1 01:39:01 2017
Ec2AMI: ami-0000030b
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.small
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb:
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: OpenStack Foundation OpenStack Nova
PciMultimedia:
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
RelatedPackageVersions:
linux-restricted-modules-4.13.0-16-generic N/A
linux-backports-modules-4.13.0-16-generic N/A
linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: 1.10.1-1ubuntu1~cloud0
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-zesty
dmi.modalias:
dmi:bvnSeaBIOS:bvr1.10.1-1ubuntu1~cloud0:bd04/01/2014:svnOpenStackFoundation:pnOpenStackNova:pvr15.0.7:cvnQEMU:ct1:cvrpc-i440fx-zesty:
dmi.product.family: Virtual Machine
dmi.product.name: OpenStack Nova
dmi.product.version: 15.0.7
dmi.sys.vendor: OpenStack Foundation
Related bugs:
* bug 1728742: [userspace] curtin dname for bcache uses unstable devname
instead of UUID Edit
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