[Bug 1861941] Re: bcache by-uuid links disappear after mounting bcache0

Wed Aug 5 21:12:59 UTC 2020

VERIFICATION FOR FOCAL:

(k)rafaeldtinoco at bcachefocal:~$ apt-cache policy bcache-tools
bcache-tools:
  Installed: (none)
  Candidate: 1.0.8-3ubuntu0.1
  Version table:
     1.0.8-3ubuntu0.1 500
        500 http://br.archive.ubuntu.com/ubuntu focal-proposed/main amd64 Packages
     1.0.8-3 500
        500 http://br.archive.ubuntu.com/ubuntu focal/main amd64 Packages

(k)rafaeldtinoco at bcachefocal:~$ apt-get install bcache-tools

(k)rafaeldtinoco at bcachefocal:~/scripts$ sudo ./test-bcache.sh 
/mnt is not a mountpoint
/dev/bcache0: 2 bytes were erased at offset 0x00000438 (ext4): 53 ef
writing 1 to /sys/class/block/bcache0/bcache/stop
writing 1 to /sys/fs/bcache/6fcbc055-be04-4527-9c73-788c2419b292/stop
/dev/vdc: 16 bytes were erased at offset 0x00001018 (bcache): c6 85 73 f6 4e 1a 45 ca 82 65 f5 7f 48 ba 6d 81
10+0 records in
10+0 records out
10485760 bytes (10 MB, 10 MiB) copied, 0.0204717 s, 512 MB/s
/dev/vdb: 16 bytes were erased at offset 0x00001018 (bcache): c6 85 73 f6 4e 1a 45 ca 82 65 f5 7f 48 ba 6d 81
10+0 records in
10+0 records out
10485760 bytes (10 MB, 10 MiB) copied, 0.0092515 s, 1.1 GB/s
UUID:			73cc1c6f-ded6-4874-b76a-465408cfbd19
Set UUID:		a2400c1f-e83b-4086-a58d-0b2ebba97a9c
version:		0
nbuckets:		2048
block_size:		1
bucket_size:		1024
nr_in_set:		1
nr_this_dev:		0
first_bucket:		1
UUID:			5f51a399-d65d-49ec-af3b-6b2b28c39605
Set UUID:		a2400c1f-e83b-4086-a58d-0b2ebba97a9c
version:		1
block_size:		1
data_offset:		16
/dev/vdc
tee: /sys/fs/bcache/register: Invalid argument
/dev/vdb
tee: /sys/fs/bcache/register: Invalid argument
total 0
drwxr-xr-x 2 root root 60 Aug  5 21:12 .
drwxr-xr-x 3 root root 60 Aug  5 21:12 ..
lrwxrwxrwx 1 root root 13 Aug  5 21:12 5f51a399-d65d-49ec-af3b-6b2b28c39605 -> ../../bcache0
Creating filesystems on bcache0
mke2fs 1.45.5 (07-Jan-2020)
Discarding device blocks: done                            
Creating filesystem with 2621438 4k blocks and 655360 inodes
Filesystem UUID: 1b609131-52ca-43f7-96b2-4dc931f2553f
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done 

mounting bcache0 to /mnt
total 0
drwxr-xr-x 2 root root 60 Aug  5 21:12 .
drwxr-xr-x 3 root root 60 Aug  5 21:12 ..
lrwxrwxrwx 1 root root 13 Aug  5 21:12 5f51a399-d65d-49ec-af3b-6b2b28c39605 -> ../../bcache0
Everything OK

All good!

** Tags removed: verification-needed-focal
** Tags added: verification-done-focal

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https://bugs.launchpad.net/bugs/1861941

Title:
  bcache by-uuid links disappear after mounting bcache0

Status in bcache-tools package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in bcache-tools source package in Bionic:
  In Progress
Status in systemd source package in Bionic:
  In Progress
Status in bcache-tools source package in Focal:
  Fix Committed
Status in systemd source package in Focal:
  In Progress

Bug description:
  1.
  root at ubuntu:~# lsb_release -rd
  Description:	Ubuntu Focal Fossa (development branch)
  Release:	20.04

  2. 
  root at ubuntu:~# lsb_release -rd
  Description:	Ubuntu Focal Fossa (development branch)
  Release:	20.04
  root at ubuntu:~# apt-cache policy linux-image-virtual 
  linux-image-virtual:
    Installed: 5.4.0.12.15
    Candidate: 5.4.0.12.15
    Version table:
   *** 5.4.0.12.15 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status
  root at ubuntu:~# apt-cache policy linux-image-5.4.0-12-generic 
  linux-image-5.4.0-12-generic:
    Installed: 5.4.0-12.15
    Candidate: 5.4.0-12.15
    Version table:
   *** 5.4.0-12.15 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status

  3. mount /dev/bcache0 && ls -al /dev/bcache/by-uuid/
  + ls -al /dev/bcache/by-uuid/
  total 0
  drwxr-xr-x 2 root root 60 Feb  4 23:31 .
  drwxr-xr-x 3 root root 60 Feb  4 23:31 ..
  lrwxrwxrwx 1 root root 13 Feb  4 23:31 abdfd1f6-44ce-4266-91db-24667b9ae51a -> ../../bcache0

  4.
  root at ubuntu:~# ls -al /dev/bcache/by-uuid
  ls: cannot access '/dev/bcache/by-uuid': No such file or directory

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-12-generic 5.4.0-12.15
  ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
  Uname: Linux 5.4.0-12-generic x86_64
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  Date: Tue Feb  4 23:31:52 2020
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-signed-5.4
  UpgradeStatus: No upgrade log present (probably fresh install)

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