[Bug 1954635] Re: subiquity crashes when attempting advanced network/disk configuration

[Todd Taft]

The major number would suggest that it's a logical volume, but it doesn't seem to correspond to a logical volume, so I'm not sure what it is:
# lsblk
NAME                      MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0                       7:0    0 377.4M  1 loop /media/filesystem
loop1                       7:1    0 221.8M  1 loop 
loop2                       7:2    0  82.1M  1 loop /usr/lib/modules
loop3                       7:3    0  61.9M  1 loop /snap/core20/1270
loop4                       7:4    0  42.2M  1 loop /snap/snapd/14066
loop5                       7:5    0  67.2M  1 loop /snap/lxd/21835
loop6                       7:6    0  24.3M  1 loop /snap/subiquity/2974
sda                         8:0    1 119.5G  0 disk 
├─sda1                      8:1    1 119.5G  0 part 
│ └─ventoy                253:8    0   1.2G  1 dm   /cdrom
└─sda2                      8:2    1    32M  0 part 
sr0                        11:0    1  1024M  0 rom  
nvme0n1                   259:0    0 953.9G  0 disk 
├─nvme0n1p1               259:4    0   260M  0 part 
├─nvme0n1p2               259:6    0    16M  0 part 
├─nvme0n1p3               259:7    0 952.6G  0 part 
└─nvme0n1p4               259:8    0   995M  0 part 
nvme1n1                   259:1    0 953.9G  0 disk 
├─nvme1n1p1               259:2    0   512M  0 part 
├─nvme1n1p2               259:3    0     1G  0 part 
└─nvme1n1p3               259:5    0 952.4G  0 part 
  ├─kangaroovg-rootlv     253:0    0     5G  0 lvm  
  ├─kangaroovg-usrlv      253:1    0    20G  0 lvm  
  ├─kangaroovg-varlv      253:2    0     5G  0 lvm  
  ├─kangaroovg-varliblv   253:3    0     7G  0 lvm  
  ├─kangaroovg-homelv     253:4    0   100G  0 lvm  
  ├─kangaroovg-srvlv      253:5    0     5G  0 lvm  
  ├─kangaroovg-usrlocallv 253:6    0     5G  0 lvm  
  └─kangaroovg-swaplv     253:7    0     8G  0 lvm  
# ls -l /dev/dm*
brw-rw---- 1 root disk 253, 0 Dec 16 03:20 /dev/dm-0
brw-rw---- 1 root disk 253, 1 Dec 16 03:20 /dev/dm-1
brw-rw---- 1 root disk 253, 2 Dec 16 03:20 /dev/dm-2
brw-rw---- 1 root disk 253, 3 Dec 16 03:20 /dev/dm-3
brw-rw---- 1 root disk 253, 4 Dec 16 03:20 /dev/dm-4
brw-rw---- 1 root disk 253, 5 Dec 16 03:20 /dev/dm-5
brw-rw---- 1 root disk 253, 6 Dec 16 03:20 /dev/dm-6
brw-rw---- 1 root disk 253, 7 Dec 16 03:20 /dev/dm-7
brw-rw---- 1 root disk 253, 8 Dec 16 03:20 /dev/dm-8

/dev/dma_heap:
total 0
crw------- 1 root root 249, 0 Dec 16 03:20 system
# lvscan
  ACTIVE            '/dev/kangaroovg/rootlv' [5.00 GiB] inherit
  ACTIVE            '/dev/kangaroovg/usrlv' [20.00 GiB] inherit
  ACTIVE            '/dev/kangaroovg/varlv' [5.00 GiB] inherit
  ACTIVE            '/dev/kangaroovg/varliblv' [7.00 GiB] inherit
  ACTIVE            '/dev/kangaroovg/homelv' [100.00 GiB] inherit
  ACTIVE            '/dev/kangaroovg/srvlv' [5.00 GiB] inherit
  ACTIVE            '/dev/kangaroovg/usrlocallv' [5.00 GiB] inherit
  ACTIVE            '/dev/kangaroovg/swaplv' [8.00 GiB] inherit
# vgscan
  Found volume group "kangaroovg" using metadata type lvm2
# ls -l /dev/kangaroovg
total 0
lrwxrwxrwx 1 root root 7 Dec 16 08:58 homelv -> ../dm-4
lrwxrwxrwx 1 root root 7 Dec 16 08:58 rootlv -> ../dm-0
lrwxrwxrwx 1 root root 7 Dec 16 08:58 srvlv -> ../dm-5
lrwxrwxrwx 1 root root 7 Dec 16 08:58 swaplv -> ../dm-7
lrwxrwxrwx 1 root root 7 Dec 16 08:58 usrlocallv -> ../dm-6
lrwxrwxrwx 1 root root 7 Dec 16 08:58 usrlv -> ../dm-1
lrwxrwxrwx 1 root root 7 Dec 16 08:58 varliblv -> ../dm-3
lrwxrwxrwx 1 root root 7 Dec 16 08:58 varlv -> ../dm-2
#

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https://bugs.launchpad.net/bugs/1954635

Title:
  subiquity crashes when attempting advanced network/disk configuration

Status in subiquity package in Ubuntu:
  New

Bug description:
  Subiquity for 20.04 crashes and a system install attempt fails when
  attempting to do an install with a complex network or disk
  configuration.

  When attempting an install with a semi-complex configuration (e.g.
  multiple network interfaces bonded together using LACP or multiple
  partitions with LVM, tmpfs, and swap), the installer will crash and
  fail.

  I am attempting an automated install using ISOs generated by the
  scripts at https://github.com/covertsh/ubuntu-autoinstall-generator
  and I am attempting to use the daily Ubuntu ISOs downloaded by that
  script.  The user-data file that is attached fails with the current
  Ubuntu ISO download; however, it works with a daily ISO download that
  I made on 2021-12-03, so it appears that something broke on or after
  that date.

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