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[dann frazier <1800562@xxxxxxxxxxxxxxxxxx>]

** Also affects: kdump-tools (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: kdump-tools (Ubuntu)

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https://bugs.launchpad.net/bugs/1800562

Title:
  Remove obsolete "nousb" option in kdump command-line for newer kernels

Status in makedumpfile package in Ubuntu:
  Confirmed
Status in kdump-tools source package in Xenial:
  New
Status in makedumpfile source package in Xenial:
  Won't Fix
Status in kdump-tools source package in Bionic:
  New
Status in makedumpfile source package in Bionic:
  Confirmed
Status in kdump-tools source package in Eoan:
  New
Status in makedumpfile source package in Eoan:
  Won't Fix
Status in kdump-tools source package in Focal:
  New
Status in makedumpfile source package in Focal:
  Confirmed
Status in kdump-tools source package in Groovy:
  New
Status in makedumpfile source package in Groovy:
  Won't Fix

Bug description:
  [Impact]
  * Kdump command-line include an obsolete "nousb" parameter by default, which can cause a misimpression: users will think they are not booting with USB, but they are.

  * Since kernel v4.5, the correct parameter to disable USB subsystem
  initialization is "usbcore.nousb" always (instead of "nousb" in case
  the subsystem is built-in). This was changed by commit 097a9ea0e48
  ("usb: make "nousb" a clear module parameter").

  * USB may be pretty essential in case for example kdump users need to
  decrypt a disk under LUKS, and there's only an USB keyboard connected
  to the system. Given the option is innocuous since Bionic, we should
  just drop it to prevent confusion.

  
  [Test Case]

  1) Deploy a Disco VM e.g. with uvt-kvm
  2) Install the kdump-tools package
  3) Run `kdump-config test`and check for the 'nousb' parameter:

  $ kdump-config test
  ...
  kexec command to be used:
    /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-4.15.0-45-generic root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0 nr_cpus=1 systemd.unit=kdump-tools.service irqpoll nousb ata_piix.prefer_ms_hyperv=0" /var/lib/kdump/vmlinuz

  
  [Regression Potential]

  The regression potential is extremely low, since the "nousb" parameter
  is not used since Bionic although is there. Any bugs we would have by
  changing this are still valid by not removing the option - the
  semantics with or without "nosub" is the same since from Bionic.

  NOTICE we won't change Xenial, it can use kernel 4.4 which indeed
  disables USB by taking the "nousb" parameter.

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