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[Paride Legovini <1896604@xxxxxxxxxxxxxxxxxx>]

** Changed in: cloud-init
       Status: Triaged => Fix Released

** Changed in: cloud-images
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1896604

Title:
  Groovy kernel (5.8.0-1004-aws) creates broken /dev/console on i3.metal
  instances

Status in cloud-images:
  Fix Committed
Status in cloud-init:
  Fix Released
Status in linux-aws package in Ubuntu:
  Fix Released

Bug description:
  [Impact]

  Starting with kernel 5.8 the default nr_uarts has been changed from 4
  to 2 for amd64, but this seems to affect i3.metal instances in AWS,
  because ttyS0 is now remapped to ttyS4 and this is breaking tools like
  cloud-init (and probably something else).

  [Test case]

  # echo > /dev/console
  bash: echo: write error: Input/output error

  [Fix]

  Setting nr_uarts=4 by default (via CONFIG_SERIAL_8250_RUNTIME_UARTS)
  restores the previous behavior and writing to /dev/console works
  without returning any error.

  [Regression potential]

  Minimal. Restores the old behavior used in 5.4 (that shouldn't have
  changed in the first place).

  [Original bug report]

  Hi,

  When running Groovy daily images on i3.metal instances a broken
  /dev/console is created. The char device appears to be writable but
  writing to it causes an Input/output error. This is breaking cloud-
  init, as it tries to log to /dev/console, and is likely to break other
  programs.

  On Focal:

  root@ip-172-31-24-163:~# ls -l /dev/console
  crw------- 1 root root 5, 1 Sep 21 16:07 /dev/console
  root@ip-172-31-24-163:~# echo x > /dev/console
  root@ip-172-31-24-163:~#

  On Groovy:

  root@ip-172-31-20-184:~# ls -l /dev/console
  crw--w---- 1 root tty 5, 1 Sep 21 16:03 /dev/console
  root@ip-172-31-20-184:~# echo x > /dev/console
  bash: echo: write error: Input/output error

  The Groovy kernel log has a

  [ 3.561696] fbcon: Taking over console

  line in it, which is not present in the Focal kernel log
  (5.4.0-1024-aws). Perhaps fbcon should be prevented from taking over
  console?

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