[Bug 1880853] Re: libc6-lse lets update-initramfs fail on AWS m6g instances

[Sorah Fukumori]

** Also affects: btrfs-progs (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  libc6-lse lets update-initramfs fail on AWS m6g instances

Status in cloud-images:
  New
Status in btrfs-progs package in Ubuntu:
  New
Status in glibc package in Ubuntu:
  New
Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  With Ubuntu 20.04 on AWS m6g.* instance family, installing libc6-lse
  lets update-initramfs always fail with the following error:

  ubuntu at ip-10-18-23-79:~$ sudo update-initramfs -u
  update-initramfs: Generating /boot/initrd.img-5.4.0-1011-aws
  E: /usr/share/initramfs-tools/hooks/btrfs failed with return 1.
  update-initramfs: failed for /boot/initrd.img-5.4.0-1011-aws with 1.

  ## Steps to reproduce (on AWS)

  ### With focal 20200423 AMI

  1. Find the following AMI and launch on m6g instance family

     ubuntu/images/hvm-ssd/ubuntu-focal-20.04-arm64-server-20200423

  2. Run: sudo apt update && sudo apt install libc6-lse
  3. Try: sudo update-initramfs -u

  ### With focal 20200522 AMI

  1. Find the following AMI and launch on m6g instance family

     ubuntu/images/hvm-ssd/ubuntu-focal-20.04-arm64-server-20200522

  2. Try: sudo update-initramfs -u

  ## Note

  - The entire log of the above steps performed on 20200423 AMI is attached.
  - Latest cloud-image AMI "ubuntu/images/hvm-ssd/ubuntu-focal-20.04-arm64-server-20200522" includes libc6-lse. On 20200522 AMI, this doesn't reproduce after removing libc6-lse manually.
  - This doesn't reproduce on EC2 a1.* instance family.

  ## Expected behavior

  Does not fail.

  ## Background to find this bug

  As the 20200522 AMI includes libc6-lse out-of-the-box & apt-get
  upgrade pulls newer package that triggers update-initramfs, apt-get
  upgrade always fail on 20200522 AMI.

  
  the following is an apport report on 20200423 AMI:

  ----

  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: arm64
  CasperMD5CheckResult: skip
  Date: Wed May 27 09:52:16 2020
  Dependencies:
   gcc-10-base 10-20200411-0ubuntu1
   libc6 2.31-0ubuntu9
   libcrypt1 1:4.4.10-10ubuntu4
   libgcc-s1 10-20200411-0ubuntu1
   libidn2-0 2.2.0-2
   libunistring2 0.9.10-2
  DistroRelease: Ubuntu 20.04
  Ec2AMI: ami-061102f51d47b1c24
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: ap-northeast-1c
  Ec2InstanceType: m6g.medium
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  Package: libc6-lse 2.31-0ubuntu9
  PackageArchitecture: arm64
  ProcCpuinfoMinimal:
   processor      : 0
   BogoMIPS       : 243.75
   Features       : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp ssbs
   CPU implementer        : 0x41
   CPU architecture: 8
   CPU variant    : 0x3
   CPU part       : 0xd0c
   CPU revision   : 1
  ProcEnviron:
   LANG=C.UTF-8
   TERM=screen-256color
   PATH=(custom, no user)
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 5.4.0-1009.9-aws 5.4.30
  SourcePackage: glibc
  Tags:  focal ec2-images
  Uname: Linux 5.4.0-1009-aws aarch64
  UpgradeStatus: No upgrade log present (probably fresh install)

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